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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
FORM 10-K
FORM10-K
(Mark One)
ý
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2020
For the fiscal year ended December 31, 2017OR
OR
o
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934
For the transition period from to
Commission file number 001-32597
CF INDUSTRIES HOLDINGS, INC.
(Exact name of registrant as specified in its charter)
Delaware20-2697511
(State or other jurisdiction of
incorporation or organization)
(I.R.S. Employer Identification No.)
4 Parkway North, Suite 40060015
Deerfield,Illinois(Zip Code)
(Address of principal executive offices)
Delaware20-2697511
(State or other jurisdiction
(847) 405-2400
(Registrant’s telephone number, including area code)
Securities registered pursuant to Section 12(b) of the Act:
incorporation or organization)
(I.R.S. Employer Identification No.)
4 Parkway North, Suite 400, Deerfield, Illinois60015
(Address of principal executive offices)(Zip Code)
Registrant's telephone number, including area code (847) 405-2400
Securities registered pursuant to section 12(b) of the Act:
Title of each class
Trading symbol(s)
Name of each exchange on which registered
Common Stock, $0.01common stock, par value $0.01 per share


CFNew York Stock Exchange
Securities Registered Pursuantregistered pursuant to Sectionsection 12(g) of the Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ý No o
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No ý
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ýNo o
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See the definitions of "large“large accelerated filer," "accelerated filer" "smaller” “accelerated filer” “smaller reporting company," and "emerging“emerging growth company"company” in Rule 12b-2 of the Exchange Act.
Large accelerated filerý
Accelerated filero
Non-accelerated filero
 (Do not check if a smaller reporting company)
Smaller reporting companyo
Emerging growth companyo
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No ý
The aggregate market value of the registrant'sregistrant’s common stock held by non-affiliates was $6,493,898,814 based onas of June 30, 2020 (the last business day of the registrant’s most recently completed second fiscal quarter), computed by reference to the closing sale price of the registrant’s common stock, on June 30, 2017.was $5,984,082,631.
233,292,049214,159,740 shares of the registrant'sregistrant’s common stock, $0.01 par value $0.01 per share, were outstanding as of January 31, 2018.29, 2021.
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant'sregistrant’s definitive proxy statement for its 20182021 annual meeting of stockholders (Proxy Statement) are incorporated herein by reference into Part III of this Annual Report on Form 10-K. The Proxy Statement will be filed with the Securities and Exchange Commission, pursuant to Regulation 14A, not later than 120 days after the end of the 20172020 fiscal year, or, if we dothe registrant does not file the Proxy Statement within such 120-day period, wethe registrant will amend this Annual Report on Form 10-K to include the information required under Part III hereof not later than the end of such 120-day period.




CF INDUSTRIES HOLDINGS, INC.
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CF INDUSTRIES HOLDINGS, INC.






PART I
ITEM 1.    BUSINESS.
Our Company
All references to "CF“CF Holdings," "we," "us," "our"” “we,” “us,” “our” and "the“the Company," refer to CF Industries Holdings, Inc. and its subsidiaries, except where the context makes clear that the reference is only to CF Industries Holdings, Inc. itself and not its subsidiaries. All references to "CF Industries"“CF Industries” refer to CF Industries, Inc., a 100% owned subsidiary of CF Industries Holdings, Inc. Notes referenced throughout this document refer to consolidated financial statement note disclosures that are found in Item 8. Financial Statements and Supplementary DataData—Notes to Consolidated Financial Statements.
We are onea leading global manufacturer of the largest manufacturershydrogen and distributors of nitrogen products for clean energy, fertilizer, productsemissions abatement, and other industrial applications. We operate nitrogen productsmanufacturing complexes in the world.United States, Canada and the United Kingdom, which are among the most cost-advantaged, efficient and flexible in the world, and an extensive storage, transportation and distribution network in North America. Our 3,000 employees focus on safe and reliable operations, environmental stewardship and disciplined capital and corporate management, driving our strategy to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our principal customers are cooperatives, independent fertilizer distributors, farmerstraders, wholesalers and industrial users. Our principalcore product is anhydrous ammonia (ammonia), which contains 82% nitrogen fertilizerand 18% hydrogen. Our nitrogen products that are upgraded from ammonia are granular urea, urea ammonium nitrate solution (UAN) and ammonium nitrate (AN). Our other nitrogen products include diesel exhaust fluid (DEF), urea liquor, nitric acid and aqua ammonia, which are sold primarily to our industrial customers, and compound fertilizer products (NPKs), which are solid granular fertilizer products for which the nutrient content is a combination of nitrogen, phosphorus and potassium. We operate world-class nitrogen manufacturing complexes in the United States, Canada and the United Kingdom, and distribute plant nutrients through a system of terminals, warehouses, and associated transportation equipment located primarily in the Midwestern United States. We also export nitrogen fertilizer products from our Donaldsonville, Louisiana and Yazoo City, Mississippi manufacturing facilities, and our United Kingdom manufacturing facilities in Billingham and Ince.
Our principal assets as of December 31, 2020 include:
fourfive U.S. nitrogen fertilizer manufacturing facilities, located in Donaldsonville, Louisiana (the largest nitrogen fertilizer complex in the world); Port Neal, Iowa; Yazoo City, Mississippi; Verdigris, Oklahoma; and Woodward, Oklahoma. These facilities are wholly owned directly or indirectly by CF Industries Nitrogen, LLC (CFN), of which we own approximately 89% and CHS Inc. (CHS) owns the remainder. See Note 16—Noncontrolling Interests for additional information on our strategic venture with CHS;remainder;
an approximately 75.3% interest in Terra Nitrogen Company, L.P. (TNCLP), a publicly traded limited partnership of which we are the sole general partner and the majority limited partner and which, through its subsidiary Terra Nitrogen, Limited Partnership (TNLP), operates a nitrogen fertilizer manufacturing facility in Verdigris, Oklahoma;
two Canadian nitrogen fertilizer manufacturing facilities, located in Medicine Hat, Alberta (the largest nitrogen fertilizer complex in Canada) and Courtright, Ontario;
two United Kingdom nitrogen manufacturing complexes,facilities, located in InceBillingham and Billingham;Ince;
an extensive system of terminals and associated transportation equipment located primarily in the Midwestern United States; and
a 50% interest in Point Lisas Nitrogen Limited (PLNL), an ammonia production joint venture located in the Republic of Trinidad and Tobago that we account for under the equity method.
On February 7, 2018, we announced that Terra Nitrogen GP Inc. (TNGP), the sole general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP on April 2, 2018, for a cash purchase price of $84.033 per unit in accordance with the terms of TNCLP’s partnership agreement. The purchase price of $84.033 per unit was determined under the terms of TNCLP’s partnership agreement as the average of the daily closing prices per common unit for the 20 consecutive trading days beginning with January 5, 2018 and ending with February 2, 2018. The purchase price of all of the 4,612,562 publicly traded common units of TNCLP is approximately $390 million. We intend to fund the purchase with cash on hand. As of the April 2, 2018 purchase date, all rights of the holders of the units will terminate, with the exception of the right to receive payment of the purchase price. Upon completion of the purchase, we will own 100 percent of the general and limited partnership interests of TNCLP, and the common units representing limited partner interests will cease to be publicly traded or listed on the New York Stock Exchange.
In 2016, we completed our capacity expansion projects at Donaldsonville, Louisiana and Port Neal, Iowa. These projects, originally announced in 2012, included the construction of new ammonia, urea, and UAN plants at our Donaldsonville,

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Louisiana complex and new ammonia and urea plants at our Port Neal, Iowa complex. These plants increased our overall production capacity by approximately 25%, improved our product mix flexibility at Donaldsonville, and improved our ability to serve upper-Midwest urea customers from our Port Neal location. These new facilities allow us to benefit from the cost advantages of North American natural gas. At our Donaldsonville complex, the ammonia plant was placed in service in October 2016, the UAN plant was placed in service in the first quarter of 2016 and the granular urea plant was placed in service in the fourth quarter of 2015. At our Port Neal, Iowa complex, both the ammonia and granular urea plants were placed in service in the fourth quarter of 2016. The total capital cost of the capacity expansion projects was $5.2 billion.
We commencedhave a strategic venture with CHS on February 1, 2016, atunder which time CHS purchased a minorityowns an equity interest in CFN, for $2.8 billion,a subsidiary of CF Holdings, which representedrepresents approximately 11% of the membership interestinterests of CFN. We own the remaining membership interest. On February 1, 2016,interests. CHS also began receivingreceives deliveries pursuant to a supply agreement under which CHS has the right to purchase annually from CFN up to approximately 1.1 million tons of granular urea and 580,000 tons of UAN at market prices. As a result of its minority equity interest in CFN, CHS is entitled to semi-annual cash distributions from CFN. We are also entitled to semi-annual cash distributions from CFN. See Note 16—17—Noncontrolling Interests for additional information on our strategic venture with CHS.
On July 31, 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK Group Limited (formerly known as GrowHow UK Group Limited) (CF Fertilisers UK) not previously owned by us for total consideration of $570 million, and CF Fertilisers UK became wholly owned by us. This transaction added CF Fertilisers UK’s nitrogen manufacturing complexes in Ince, United Kingdom and Billingham, United Kingdom to our consolidated manufacturing capacity. 
For the years ended December 31, 2017, 20162020, 2019 and 2015,2018, we sold 20.020.3 million, 17.019.5 million and 13.719.3 million product tons generating net sales of $4.13$4.12 billion, $3.69$4.59 billion and $4.31$4.43 billion, respectively.
Our principal executive offices are located outside of Chicago, Illinois, at 4 Parkway North, Suite 400, Deerfield, Illinois 60015, and our telephone number is 847-405-2400. Our Internet website address is www.cfindustries.com. Information made available on our website does not constitute part of this Annual Report on Form 10-K.
We make available free of charge on or through our Internet website, www.cfindustries.com, all of our reports on Forms 10-K, 10-Q and 8-K and all amendments to those reports as soon as reasonably practicable after such material is filed electronically with, or furnished to, the Securities and Exchange Commission (SEC). Copies of our Corporate Governance Guidelines, Code of Corporate Conduct and charters for the Audit Committee, Compensation and Management Development Committee, and Corporate Governance and Nominating Committee, and Environmental Sustainability and Community Committee of our Board of Directors (the Board) are also available on our Internet website. We will provide electronic or paper copies of
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these documents free of charge upon request. The SEC also maintains a website at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC.
Our Commitment to a Clean Energy Economy
In October 2020, we announced that we are taking significant steps to support a global hydrogen and clean fuel economy, through the production of green and low-carbon ammonia. Since ammonia is one of the most efficient ways to transport and store hydrogen and is also a fuel in its own right, we believe that the Company, as the world’s largest producer of ammonia, with an unparalleled manufacturing and distribution network and deep technical expertise, is uniquely positioned to fulfill anticipated demand for hydrogen and ammonia from green and low-carbon sources. Our strategy is to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our approach will focus on green ammonia production, which refers to ammonia produced through a carbon-free process, and low-carbon ammonia, which relates to ammonia produced by conventional processes but with CO2 removed through carbon capture and sequestration (CCS) and other certified carbon abatement projects. We have announced an initial green ammonia project at our flagship Donaldsonville nitrogen complex to produce approximately 20,000 tons per year of green ammonia. Additionally, we are developing CCS and other carbon abatement projects across our production facilities that will enable us to produce low-carbon ammonia.
Company History
We were founded in 1946 as a fertilizer brokerage operationCentral Farmers Fertilizer Company, and were owned by a group of regional agricultural cooperatives. Duringagriculture cooperatives for the 1960s,first 59 years of our existence. Central Farmers became CF Industries in 1970.
Originally established as a fertilizer brokerage company, we expanded our distribution capabilitiesowning and diversified intooperating fertilizer manufacturing through the acquisition of several existing plants and facilities. During the 1970s and again during the 1990s, we expanded our production and distribution capabilities significantly, spending approximately $1 billionfacilities in eachthe early 1950s with a principal objective of these decades.assured supply for our owners. At various times in our history, we manufactured and/or distributed nitrogen, phosphate and potash fertilizers.
We operated as a traditional manufacturing and supply cooperative until 2002, when we adopted a new business model that established financial performance as our principal objective, rather than assured supply to our owners. A critical aspect of the new business model was to establish a more economically driven approach to the marketplace.
In August 2005, we completed our initial public offering (IPO) of common stock, which is listed on the New York Stock Exchange. In connection with the IPO, we consummated a reorganization transaction whereby we ceased to be a cooperative and our pre-IPO owners'owners’ equity interests in CF Industries were canceled in exchange for all of the proceeds of the offering and shares of our common stock. At the time of the IPO, our assets consisted of one wholly owned nitrogen manufacturing facility in Louisiana, United States; a joint venture nitrogen manufacturing facility in Alberta, Canada, of which we owned 66 percent; a phosphate mining and manufacturing operation in Florida, United States; and distribution facilities throughout North America.
In April 2010, we acquired Terra Industries Inc. (Terra), a leading North American producer and marketer of nitrogen fertilizer products for a purchase price of $4.6 billion, which was paid in cash and shares of our common stock. As a result of the Terra acquisition, we acquired five nitrogen fertilizer manufacturing facilities, ouran approximately 75.3% interest in TNCLP and certain joint venture interests.
In March 2014, we completed the sale ofexited our phosphate mining and manufacturing business, which was located in Florida, through a sale to The Mosaic Company for approximately $1.4 billion in cash.

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As a result, our company became focused solely on nitrogen manufacturing and distribution.
In July 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK Group Limited (formerly known as GrowHow UK Group Limited) (CF Fertilisers UK) not previously owned by us for total consideration of $570 million, and CF Fertilisers UK became wholly owned by us. This transaction added CF Fertilisers UK’s nitrogen manufacturing complexes in Ince, United Kingdom and Billingham, United Kingdom to our consolidated manufacturing capacity.
In February 2016, our strategic venture with CHS commenced, at which time CHS purchasedmade a minority equity interestcapital contribution of $2.8 billion to CFN in exchange for membership interests in CFN, for $2.8 billion.which represented approximately 11% of the total membership interests of CFN.
In late 2015 and 2016, we completed certain capacity expansion projects at Donaldsonville, Louisiana and Port Neal, Iowa. These projects, originally announced in 2012, included the construction of new ammonia, urea, and UAN plants at our Donaldsonville, Louisiana complex and new ammonia and urea plants at our Port Neal, Iowa whichcomplex. These plants increased our overall production capacity by approximately 25% for a, improved our product mix flexibility at Donaldsonville, and improved our ability to serve upper-Midwest urea customers from our Port Neal location. The total capital cost of the capacity expansion projects was $5.2 billion.
On February 7,
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Prior to April 2, 2018, Terra Nitrogen, Limited Partnership, which owns and operates our nitrogen manufacturing facility in Verdigris, Oklahoma, was a subsidiary of Terra Nitrogen Company, L.P. (TNCLP). TNCLP was a publicly traded limited partnership of which we were the sole general partner and the majority limited partner, and in which we owned an approximate 75.3% interest.
In 2018, we announced that, TNGPin accordance with the terms of TNCLP’s First Amended and Restated Agreement of Limited Partnership (as amended by Amendment No. 1 to the First Amended and Restated Agreement of Limited Partnership, the TNCLP Agreement of Limited Partnership), Terra Nitrogen GP Inc. (TNGP), the sole general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP on(the TNCLP Public Units). On April, 2, 2018, TNGP completed its purchase of the TNCLP Public Units (the Purchase) for aan aggregate cash purchase price of $84.033 per unit in accordance$388 million. We funded the Purchase with the terms of TNCLP’s partnership agreement. The purchase price of all of the 4,612,562 publicly traded common units of TNCLP is approximately $390 million.cash on hand. Upon completion of the purchase, we will ownPurchase, CF Holdings owned, through its subsidiaries, 100 percent of the general and limited partnership interests of TNCLP.
Product Tons and Nutrient Tons
Unless otherwise stated, we measure our production and sales volume in this Annual Report on Form 10-K in product tons, which represents the weight of the product measured in short tons (one short ton is equal to 2,000 pounds). References to UAN product tons assume a 32% nitrogen content basis for production volume. 
We also provide certain supplementary volume information measured in nutrient tons. Nutrient tons represent the weight of the product’s nitrogen content, which varies by product. Ammonia represents 82% nitrogen content, granular urea represents 46% nitrogen content, UAN represents between 28% and 32% nitrogen content and AN represents between 29% and 35% nitrogen content. 
Reportable Segments
Our reportable segments consist of the following segments: ammonia, granular urea, UAN, AN and Other. These segments are differentiated by products. We use gross margin to evaluate segment performance and allocate resources. Total other operating costs and expenses (consisting of selling, general and administrative expenses and other operating—net) and non-operating expenses (interest and income taxes), are centrally managed and are not included in the measurement of segment profitability reviewed by management. See Note 20—21—Segment Disclosures for additional information.
Our Products
Our primary nitrogen fertilizer products are ammonia, granular urea, UAN and AN. Our historical sales of nitrogen fertilizer products are shown in the following table. Net sales do not reflect amounts used internally, such as ammonia, in the manufacture of other products.
2017 2016 2015 202020192018
Sales Volume (tons) Net Sales Sales Volume (tons) Net Sales Sales Volume (tons) Net Sales Sales Volume (tons)Net SalesSales Volume (tons)Net SalesSales Volume (tons)Net Sales
(tons in thousands; dollars in millions) (tons in thousands; dollars in millions)
Products       
  
  
Products   
Ammonia4,105
 $1,209
 2,874
 $981
 2,995
 $1,523
Ammonia3,767 $1,020 3,516 $1,113 3,135 $1,028 
Granular urea4,357
 971
 3,597
 831
 2,460
 788
Granular urea5,148 1,248 4,849 1,342 4,898 1,322 
UAN7,093
 1,134
 6,681
 1,196
 5,865
 1,480
UAN6,843 1,063 6,807 1,270 7,042 1,234 
AN2,353
 497
 2,151
 411
 1,290
 294
AN2,216 455 2,109 506 2,002 460 
Other(1)
2,044
 319
 1,654
 266
 1,108
 223
Other(1)
2,322 338 2,257 359 2,252 385 
Total19,952
 $4,130
 16,957
 $3,685
 13,718
 $4,308
Total20,296 $4,124 19,538 $4,590 19,329 $4,429 

(1)
(1)Other segment products include DEF, urea liquor, nitric acid, aqua ammonia and NPKs.
Other segment products include DEF, urea liquor, nitric acid, aqua ammonia and NPKs.
Gross margin was $430$801 million, $840$1,174 million and $1,547$917 million for the years ended December 31, 2017, 20162020, 2019 and 2015,2018, respectively.
We own and operate seven nitrogen fertilizer manufacturing facilities in North America, including five nitrogen fertilizer manufacturing facilities in the United States, oneand two in Medicine Hat, Alberta, Canada and one in Courtright, Ontario, Canada. As of December 31, 2017,2020, the combined production capacity of these seven facilities represented approximately 37%, 42%, 43%, 44%

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and 19% of North American ammonia, granular urea, UAN and AN production capacity, respectively. Each of our nitrogen fertilizer manufacturing facilities in North America has on-site storage to provide
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flexibility to manage the flow of outbound shipments without impacting production.
We also operate two United Kingdom nitrogen manufacturing complexes located in Ince and Billinghamfacilities that produce ammonia, AN and NPKs and serve primarily the British agricultural and industrial markets.
The following table shows the production capacities as of December 31, 20172020 at each of our nitrogen manufacturing facilities:
Average Annual Capacity(1)
Average Annual Capacity(1)
Gross
Ammonia(2)
 
Net
Ammonia(2)
 
UAN(3)
 
Urea(4)
 
AN(5)
 
Other(6)
Gross
Ammonia(2)
Net
Ammonia(2)
UAN(3)
Urea(4)
AN(5)
Other(6)
(tons in thousands) (tons in thousands)
Donaldsonville, Louisiana(7)
4,335
 1,390
 3,255
 2,635
 
 445
Donaldsonville, Louisiana(7)
4,335 1,390 3,255 2,635 — 445 
Medicine Hat, Alberta1,230
 770
 
 810
 
 
Medicine Hat, Alberta1,230 770 — 810 — — 
Port Neal, Iowa1,230
 110
 800
 1,350
 
 110
Port Neal, Iowa1,230 110 800 1,350 — 110 
Verdigris, Oklahoma(8)(9)
1,210
 430
 1,955
 
 
 
Verdigris, Oklahoma(8)
Verdigris, Oklahoma(8)
1,210 430 1,955 — — — 
Woodward, Oklahoma480
 130
 810
 
 
 115
Woodward, Oklahoma480 130 810 — — 115 
Yazoo City, Mississippi(9)(10)
570
 
 160
 
 1,035
 125
Courtright, Ontario(9)(11)
500
 265
 345
 
 
 400
Ince, U.K.(12)
380
 15
 
 
 575
 415
Billingham, U.K.(9)
595
 230
 
 
 625
 410
Yazoo City, Mississippi(8)(9)
Yazoo City, Mississippi(8)(9)
570 — 160 — 1,035 125 
Courtright, Ontario(8)(10)
Courtright, Ontario(8)(10)
500 265 345 — — 400 
Ince, U.K.(11)
Ince, U.K.(11)
380 15 — — 575 415 
Billingham, U.K.(8)
Billingham, U.K.(8)
595 230 — — 625 410 
10,530
 3,340
 7,325
 4,795
 2,235
 2,020
10,530 3,340 7,325 4,795 2,235 2,020 
Unconsolidated Affiliate 
  
  
  
  
  
Unconsolidated Affiliate      
Point Lisas, Trinidad(13)
360
 360
 
 
 
 
Point Lisas, Trinidad(12)
Point Lisas, Trinidad(12)
360 360 — — — — 
Total10,890
 3,700
 7,325
 4,795
 2,235
 2,020
Total10,890 3,700 7,325 4,795 2,235 2,020 

(1)
Average annual capacity includes allowance for normal outages and planned maintenance shutdowns.
(2)
Gross ammonia capacity includes ammonia used to produce upgraded products. Net ammonia capacity is gross ammonia capacity less ammonia used to produce upgraded products based on the product mix shown in the table.
(3)
Measured in tons of UAN containing 32% nitrogen by weight.
(4)
Reflects granular urea capacity from the Donaldsonville, Medicine Hat, and Port Neal facilities. Urea liquor and diesel exhaust fluid production capacities are included in Other.
(5)
AN includes prilled products (Amtrate and industrial-grade AN, or IGAN) and AN solution produced for sale.
(6)
Includes product tons of: urea liquor and DEF from the Donaldsonville, Port Neal, Woodward, and Yazoo City, and Courtright facilities; nitric acid from the Courtright, Yazoo City, Billingham, and Ince facilities; and NPKs from the Ince facility. Production of DEF can be increased by reducing urea and/or UAN production.
(7)
The Donaldsonville facility capacities present an estimated production mix. This facility is capable of producing between 2.4 million and 3.3 million tons of granular urea and between 1.2 million and 4.3 million tons of UAN annually. The facility is also capable of producing up to 1.2 million product tons of 32.5% DEF.
(8)
Represents 100% of the capacity of this facility.
(9)
Reduction of UAN or AN production at the Yazoo City, Courtright, Verdigris and Billingham facilities can allow more merchant nitric acid to be made available for sale.
(10)
The Yazoo City facility's production capacity depends on product mix. With the facility maximizing the production of AN products, 160,000 tons of UAN can be produced. UAN production can be increased to 450,000 tons by reducing the production of AN to 900,000 tons.
(11)
Production of urea liquor and DEF at the Courtright facility can be increased by reducing UAN production.
(12)
The Ince facility can increase production of NPKs and nitric acid by reducing AN production.
(13)
Represents our 50% interest in the capacity of PLNL.

(1)Average annual capacity includes allowance for normal outages and planned maintenance shutdowns.

(2)Gross ammonia capacity includes ammonia used to produce upgraded products. Net ammonia capacity is gross ammonia capacity less ammonia used to produce upgraded products based on the product mix shown in the table.
(3)Measured in tons of UAN containing 32% nitrogen by weight.
(4)Reflects granular urea capacity from the Donaldsonville, Medicine Hat, and Port Neal facilities. Urea liquor and DEF production capacities are included in Other.
(5)AN includes prilled products (Amtrate and industrial-grade AN, or IGAN) and AN solution produced for sale.
(6)Includes product tons of: urea liquor and DEF from the Donaldsonville, Port Neal, Woodward, Yazoo City, and Courtright facilities; nitric acid from the Courtright, Yazoo City, Billingham, and Ince facilities; and NPKs from the Ince facility. Production of DEF can be increased by reducing urea and/or UAN production.
(7)The Donaldsonville facility capacities present an estimated production mix. This facility is capable of producing between 2.4 million and 3.3 million tons of granular urea and between 1.2 million and 4.3 million tons of UAN annually. The facility is also capable of producing up to 1.2 million product tons of 32.5% DEF.
(8)Reduction of UAN or AN production at the Yazoo City, Courtright, Verdigris, and Billingham facilities can allow more merchant nitric acid to be made available for sale.
(9)The Yazoo City facility’s production capacity depends on product mix. With the facility maximizing the production of AN products, 160,000 tons of UAN can be produced. UAN production can be increased to 450,000 tons by reducing the production of AN to 900,000 tons.
(10)Production of urea liquor and DEF at the Courtright facility can be increased by reducing UAN production.
(11)The Ince facility can increase production of NPKs and nitric acid by reducing AN production.
(12)Represents our 50% interest in the capacity of PLNL.

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The following table summarizes our nitrogen fertilizer production volume for the last three years.years:
December 31, December 31,
2017 2016 2015 202020192018
(tons in thousands) (tons in thousands)
Ammonia(1)
10,295
 8,307
 7,673
Ammonia(1)
10,353 10,246 9,805 
Granular urea4,451
 3,368
 2,520
Granular urea5,001 4,941 4,837 
UAN (32%)6,914
 6,698
 5,888
UAN (32%)6,677 6,768 6,903 
AN2,127
 1,845
 1,283
AN2,115 2,128 1,731 

(1)
(1)Gross ammonia production, including amounts subsequently upgraded on-site into granular urea, UAN or AN.
Gross ammonia production, including amounts subsequently upgraded on-site into granular urea, UAN or AN.
Donaldsonville, Louisiana
The Donaldsonville nitrogen fertilizer complexfacility is the world'sworld’s largest and most flexible nitrogen fertilizer production facility.complex. It has six ammonia plants, five urea plants, four nitric acid plants, three UAN plants, and one DEF plant. The complex, which is located on the Mississippi River, includes deep-water docking facilities, access to an ammonia pipeline, and truck and railroad loading capabilities. The complex has on-site storage for 160,000140,000 tons of ammonia, 201,000 tons of UAN (measured on a 32% nitrogen content basis) and 173,000130,000 tons of granular urea.
As part of our capacity expansion projects, the new Donaldsonville urea plant became operational during the fourth quarter of 2015. The new UAN plant was placed in service in the first quarter of 2016, and the new ammonia plant was placed in service in October 2016. For additional details regarding the capacity expansion projects, see Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.
Medicine Hat, Alberta, Canada
The Medicine Hat facility, located in southeast Alberta, is the largest nitrogen fertilizer complex in Canada. It has two ammonia plants and one urea plant. The complex has on-site storage for 60,000 tons of ammonia and 60,000 tons of granular urea.
Port Neal, Iowa
The Port Neal facility is located approximately 12 miles south of Sioux City, Iowa, on the Missouri River. The facility consists of two ammonia plants, three urea plants, two nitric acid plants and aone UAN plant. The location has on-site storage for 90,00085,000 tons of ammonia, 154,000130,000 tons of granular urea, and 81,000100,000 tons of 32% UAN.
As part of our capacity expansion projects, both the ammonia and urea plants were placed in service in December 2016. For additional details regarding the capacity expansion projects, see Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.
Verdigris, Oklahoma
The Verdigris facility is located northeast of Tulsa, Oklahoma, near the Verdigris River and is owned by TNLP.River. It is the second largest UAN production facility in North America. The facility comprises two ammonia plants, two nitric acid plants, two UAN plants and a port terminal. Through our approximately 75.3% interest in TNCLP and its subsidiary, TNLP, we operate the plants andWe lease the port terminal from the Tulsa-Rogers County Port Authority. The complex has on-site storage for 60,000 tons of ammonia and 100,000 tons of 32% UAN.
Woodward, Oklahoma
The Woodward facility is located in rural northwest Oklahoma and consists of anone ammonia plant, two nitric acid plants, two urea plants and two UAN plants. The facility has on-site storage for 36,000 tons of ammonia and 84,000 tons of 32% UAN.
Yazoo City, Mississippi
The Yazoo City facility is located in central Mississippi and includes one ammonia plant, four nitric acid plants, anone AN plant, two urea plants, aone UAN plant and a dinitrogen tetroxide production and storage facility. The site has on-site storage for 50,000 tons of ammonia, 48,000 tons of 32% UAN and 11,000 tons of AN and related products.

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Courtright, Ontario, Canada
The Courtright facility is located south of Sarnia, Ontario near the St. Clair River. The facility consists of an ammonia plant, a UAN plant, a nitric acid plant and a urea plant. The location has on-site storage for 64,000 tons of ammonia 10,400 tons of granular urea and 16,000 tons of 32% UAN.
Ince, United Kingdom
The Ince facility is located in northwestern England and consists of anone ammonia plant, three nitric acid plants, anone AN plant and three NPK plants. The location has on-site storage for 11,000 tons of ammonia, 95,000 tons of AN, and 40,000 tons of NPKs.
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Billingham, United Kingdom
The Billingham facility, located in the Teesside chemical area in northeastern England, is geographically split among three primary locations: the main site, which contains an ammonia plant, three nitric acid plants and a carbon dioxide plant; the Portrack site, approximately two miles away, which contains an AN fertilizer plant; and the North Tees site, approximately seven miles away, which contains an ammonia storage area. These locations collectively have on-site storage for 40,000 tons of ammonia and 128,000 tons of AN.
Point Lisas, Trinidad
The Point Lisas Nitrogen facility in the Republic of Trinidad and Tobago is owned jointly through a 50/50 venture with Koch Fertilizer LLC. This facility has the capacity to produce 720,000 tons of ammonia annually from natural gas supplied under a contract with theThe National Gas Company of Trinidad and Tobago Limited (NGC).
Nitrogen Fertilizer Raw Materials
Natural gas is the principal raw material and primary fuel source used in the ammonia production process at our nitrogen fertilizer manufacturing facilities. In 2017,2020, natural gas accounted for approximately 47%one-third of our total production costs for nitrogen fertilizer products. Our nitrogen fertilizer manufacturing facilities have access to abundant, competitively-priced natural gas through a reliable network of pipelines that are connected to major natural gas trading hubs near the facilities. Our facilities utilize the following natural gas hubs: Henry Hub in Louisiana; SONAT in Louisiana; TETCO ELA in Louisiana; ONEOK in Oklahoma; AECO in Alberta; Ventura in Iowa; Demarcation in Kansas; Welcome in Minnesota; Dawn in Ontario; Parkway in Ontario; and the National Balancing Point (NBP) in the United Kingdom.
In 2017,2020, our nitrogen manufacturing facilities consumed, in the aggregate, approximately 356365 million MMBtus of natural gas. In 2017, the amount of natural gas consumed by our nitrogen manufacturing facilities increased as a result of the completion of our capacity expansion projects. We employ a combination of daily spot and term purchases from a variety of quality suppliers to maintain a reliable, competitively-priced supply of natural gas. We also use certain financial instruments to hedge natural gas prices. See Note 14—15—Derivative Financial Instruments for additional information about our natural gas hedging activities.
Nitrogen Fertilizer Distribution
The safe, efficient and economical distribution of nitrogen fertilizer products is critical for successful operations. Our nitrogen fertilizer production facilities have access to multiple transportation modes by which we ship fertilizer products to terminals, warehouses and customers. Each of our production facilities has a unique distribution pattern based on its production capacity and location.
Our North American nitrogen production facilities can ship products via truck and rail to customers and to our storage facilities in the U.S. and Canada, with access to our leased railcar fleet of approximately 5,000 tank and hopper cars, as well as railcars provided by rail carriers. Our United Kingdom nitrogen production facilities mainly ship products via truck.
The North American waterway system is also used extensively to ship products from our Donaldsonville, Verdigris and Yazoo City facilities. To ship ammonia and UAN, we employ a fleet of ten tow boats and thirty-twotwenty-eight river barges, which are primarily leased. We also utilize contract marine services to move urea fertilizer. We can also export nitrogen fertilizer products via seagoing vessels from our Donaldsonville, Yazoo City, Billingham and Ince manufacturing facilities.
Three of our nitrogen production facilities also have access to pipelines for the transportation of ammonia. The Donaldsonville facility is connected to the 2,000-mile long Nustar pipeline through which we have the ability to transport ammonia to more than 20ten terminals and shipping points in the midwesternMidwestern U.S. corn belt. Our Verdigris and Port Neal facilities are connected to the 1,100-mile long Magellan ammonia pipeline that also serves the Midwestern United States.

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Storage Facilities and Other Properties
As of December 31, 2017,2020, we owned or leased space at 6263 in-market storage terminals and warehouses located in a 22-state21-state region of the United States, Canada and the United Kingdom. Including storage at our production facilities, we have an aggregate storage capacity for approximately 3.53.2 million tons of fertilizer.product. Our storage capabilities are summarized in the following table.table:
Ammonia Granular Urea 
UAN(1)
 AN AmmoniaGranular Urea
UAN(1)
AN
Number of
Facilities
 
Capacity
(000 Tons)
 
Number of
Facilities
 
Capacity
(000 Tons)
 
Number of
Facilities
 
Capacity
(000 Tons)
 
Number of
Facilities
 
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Plants9
 571
 5
 437
 6
 530
 3
 234
Plants546 320 549 234 
Terminal and Warehouse Locations               Terminal and Warehouse Locations
Owned22
 810
 1
 200
 8
 219
 
 
Owned22 780 — — 244 — — 
Leased(2)
4
 130
 1
 7
 26
 342
 
 
Leased(2)
124 32 24 391 — — 
Total In-Market26
 940
 2
 207
 34
 561
 
 
Total In-Market28 904 32 33 635 — — 
Total Storage Capacity 
 1,511
  
 644
  
 1,091
  
 234
Total Storage Capacity1,450 352 1,184 234 

(1)
(1)Capacity is expressed as the equivalent volume of UAN measured on a 32% nitrogen content basis.
(2)Our lease agreements are typically for periods of one to five years.
Capacity is expressed as the equivalent volume of UAN measured on a 32% nitrogen content basis.
(2)
Our lease agreements are typically for periods of one to five years.
Customers
The principal customers for our nitrogen fertilizer and other nitrogen products are cooperatives, independent fertilizer distributors, farmerstraders, wholesalers and industrial users. CHS was our largest customer in 2017 and accounted for approximately 11% of our consolidated net sales. Sales are generated by our internal marketing and sales force. CHS was our largest customer in 2020 and accounted for approximately 13% of our consolidated net sales. We have a strategic venture with CHS under which CHS has a minority equity interest in CFN. See Note 17—Noncontrolling Interests for additional information on our strategic venture with CHS.
Competition
Our markets are global and intensely competitive, based primarily on delivered price and, to a lesser extent, on customer service and product quality. During the peak demand periods, product availability and delivery time also play a role in the buying decisions of customers.
Our primary North American-based competitors include Nutrien Ltd. (formed in January 2018 by the merger of Agrium Inc. and Potash Corporation of Saskatchewan Inc.), Koch Fertilizer LLC and Iowa Fertilizer Company. Additionally, Yara BASF is expected to bring a new North American nitrogen fertilizer production facility on line in 2018. There is also significant competition from products sourced from other regions of the world, including some with lower natural gas or other feedstock costs. Because ammonia, urea and UAN are widely-traded fertilizer products and there are limited barriers to entry, we experience competition from foreign-sourced products continuously.
Our primary United Kingdom competition comes from imported products supplied by companies including Yara International, Origin Fertilisers, Ameropa, CHS and Helm. Urea and UAN are not produced in the United Kingdom, but along with AN are widely-traded fertilizer products with limited barriers to entry.
Seasonality
The fertilizer business is seasonal. The degree of seasonality of our business can change significantly from year to year due to weather conditions in the agricultural industry and other factors. The strongest demand for our products in North America occurs during the spring planting season, with a second period of strong demand following the fall harvest. WeIn contrast, we and other fertilizer producers generally manufacture and distribute products throughout the year. As a result, we and/or our customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application season and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in our sales volumes and net sales being the highest during the spring and our working capital requirements being the highest just prior to the start of the spring planting season. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in planting schedules and purchasing patterns.
Financial Information About Foreign and Domestic Sales and Operations
The amount of net sales attributable to our sales to foreign and domestic markets over the last three fiscal years and the carrying value of our foreign and domestic long-lived assets are set forth in Note 20—Segment Disclosures.

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Environmental, Health and Safety
We are subject to numerous environmental, health and safety laws and regulations in the United States, Canada, the United Kingdom, the European Union and the Republic of Trinidad and Tobago, including laws and regulations relating to the generation and handling of hazardous substances and wastes; the cleanup of hazardous substance releases; the discharge of regulated substances to air or water; and the demolition of existing plant sites upon permanent closure. In the United States, these laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act (RCRA), the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), the Toxic Substances Control Act (TSCA), the Occupational Safety and Health Act (OSHA) and various other federal, state provincial,and local and international statutes. Violations of environmental, health and safety laws can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. In addition, environmental, health and safety laws and regulations may impose joint and several liability, without regard to fault, for cleanup costs on potentially responsible parties who have released or disposed of hazardous substances into the environment. We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future.
Environmental, Health and Safety Expenditures
Our environmental, health and safety capital expenditures in 20172020 totaled approximately $21$40 million. We estimate that we will have approximately $60$45 million of capital expenditures for environmental, health and safety in 2018.2021. In addition, to support safe and reliable operations at our continuous process manufacturing facilities, we conduct scheduled inspections, replacements and overhauls of our plant machinery and equipment, which are referred to as turnarounds. A further description of turnaround activities is included in Note 6—Property, Plant and Equipment—Net to our consolidated financial statements included in Item 8 of this report. Environmental, health and safety laws and regulations are complex, change frequently and have tended to become more stringent over time. We expect that continued government and public emphasis on environmental issues will result in increased future expenditures for environmental controls at our operations.manufacturing and distribution facilities. Such expenditures could have a material adverse effect on our business, financial condition, results of operations and cash flows. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial expenditures. Our costs to comply with, or any liabilities under, these laws and regulations could have a material adverse effect on our business, financial condition, results of operations and cash flows.
CERCLA/Remediation Matters
From time to time, we receive notices from governmental agencies or third parties alleging that we are a potentially responsible party at certain cleanup sites under CERCLA or other environmental cleanup laws. In 2011, we received a notice from the Idaho Department of Environmental Quality (IDEQ) that alleged that we were a potentially responsible party for the cleanup of a former phosphate mine site we owned in the late 1950s and early 1960s located in Georgetown Canyon, Idaho. The current owner of the property and a former mining contractor received similar notices for the site. WeBased on a Consent Order entered into with IDEQ and the U.S. Forest Service in 2014, we and the current property owner are currently conducting a remedial investigation/investigation and feasibility study of the site. In 2015, we and several other parties received a notice that the U.S. Department of the Interior and other trustees intend to undertake a natural resource damage assessment for a group of17 former phosphate mines in southeast Idaho, includingone of which is the former Georgetown Canyon mine. See Note 19—20—Contingencies for additional information on the CERCLA/Remediation matters.information.
Regulation of Greenhouse Gases
We are subject to regulations in the United Kingdom, the European Union, Canada and the United States concerning greenhouse gas (GHG) emissions.
The United Kingdom is a party to the Kyoto Protocol. As a result of agreements reached during a conference in Durban, South Africa in 2011, the Kyoto Protocol will continue in force for a second commitment period, which will expire by 2020. On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5°C above pre-industrial levels. The Paris Agreement, which has been accepted by the United States and ratified by Canada and the United Kingdom, went into effect in November 2016. The Paris Agreement could result in more aggressive efforts to reduce GHG emissions in the jurisdictions in which we operate.
The United Kingdom has adopted GHG emissions regulations, including regulations to implement the European Union Greenhouse Gas Emission Trading System.System (EU ETS). Our U.K. manufacturing plants are required to report GHG emissions annually to the United Kingdom Environment Agency pursuant to their site Environmental Permits and Climate Change Agreement, which specify energy efficiency targets. Failure to meet efficiency targets may require these plants to purchase CO2 emissions allowances. The steam boilers at each of our U.K. sites arehave also been subject to the EU ETS, and have been required to hold or obtain emissions allowances to offset GHG emissions. Notwithstanding the exit of the United Kingdom from the European Union (Brexit) on January 31, 2020, facilities in the United Kingdom remained subject to the EU ETS through the end of 2020. Beginning on January 1, 2021, our U.K. manufacturing plants became subject to the UK Emissions Trading Scheme.
Canada withdrew from further participation inScheme (UK ETS). At least initially, the Kyoto Protocol in December 2011, butUK ETS is a partyexpected to be similar to the Paris Agreement. EU ETS, although the U.K. government has stated that it intends to establish an emissions cap that is lower than what it would have been had the United Kingdom remained subject to the EU ETS. No agreement has been reached as to whether the UK ETS will establish a linkage with the EU ETS or other national emission trading systems.
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In Canada, we are required to conduct an annual review of our operations with respect to compliance with

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Environment Canada'sCanada’s National Pollutant Release Inventory and Ontario'sOntario’s Mandatory Monitoring and Reporting Regulation and the GHG Reporting Regulation. In addition,2018, the federal Greenhouse Pollution Pricing Act came into effect, pursuant to which Environment and Climate Change Canada (ECCC) will implement the Output-Based Performance Standard (OBPS), which is intended to function as a backstop to provincial greenhouse gas emissions regulations. In June 2019, the ECCC finalized the emission limits for carbon dioxide equivalent (CO2e) emissions from nitrogen fertilizer products. These emission limits are based on 95% of the average emissions intensity for the production of such products from all Canadian nitrogen fertilizer plants, reflecting that such products are deemed to be energy-intensive and trade-exposed and thus subject to a less stringent emissions reduction requirement. In the provinces and territories where the OBPS applies, a facility whose carbon emissions exceed the applicable limits is required to offset emissions by obtaining and retiring surplus emission credits, obtaining qualifying emissions offsets, or paying a fee, which for calendar year 2019 was CAD $20 per ton of excess carbon dioxide equivalent, and which fee increases by CAD $10 per ton for each succeeding year through 2022. In December 2020, the Canadian nationalfederal government announced that it intended to increase the price of excess emissions of CO2e by CAD $15 per ton for each year beginning in collaboration2023, with Canadian provinces,the price of excess CO2e emissions reaching CAD $170 per ton by 2030. Ontario, Saskatchewan and Alberta are challenging whether the federal government has developedjurisdiction to impose a Pan-Canadian Framework on Clean Growth and Climate Change. Among other things, the framework establishes a nationwidefederal carbon price on carbon emissions, which price serves as a floor for the GHG emissions reduction requirements of the separate Canadian provinces and territories. The announced plan would impose a $10 per ton (Canadian dollars) charge beginningSaskatchewan Court of Appeal (in May 2019) and the Ontario Court of Appeal (in June 2019) each held that the Greenhouse Pollution Pricing Act (GPPA) was validly enacted under the Canadian constitution, while the Alberta Court of Appeal ruled in 2018, rising to $50 per ton by 2022. The framework provides for a reviewFebruary 2020 that the GPPA was unconstitutional. Oral argument on the appeal of the approach takenthese decisions was heard by the national government and the provinces to address further action after 2022.Supreme Court of Canada in September 2020.
Ontario is party to the Western Climate Initiative (WCI), comprising California and several Canadian provinces. OnIn January 1, 2017, Ontario launched its own GHG cap and trade program. Under this program the Ontario government will set a hard limit on emissions, which will steadily decline annually. By 2020, the cap will mandate that GHG emissions decline by 15% compared to 1990 levels. Facilities that generate more than 25,000 tonnes of GHG emissions per year will be required to participate in theand beginning January 1, 2018, Ontario’s cap and trade program and will require emissions allowances for every tonne of GHG emitted. During the 2017-2020 compliance period, we are eligible to receive free emissions allowances, although the amount of free allowances will decline through 2020. This will require us to purchase emission allowances or to reduce GHG emissions. Ontario has stated it intends to reassess the extent to which it will provide free allowances for post-2020 compliance periods. Beginning January 1, 2018, Ontario's cap and trade program iswas linked with the cap and trade programs ofin Quebec and California.
Our Courtright Nitrogen Complex was subject to the Ontario cap and trade program. However, the Ontario government rescinded the cap and trade program in June 2018. Because Ontario no longer had a GHG regulatory regime, the federal government imposed the OBPS in the province beginning in 2019. In Alberta,July 2019, the Specified Gas Emitters Regulation (GHG Regulation) was implemented in 2007. Thisnew Ontario government enacted a new GHG regulation, called the Emissions-Performance Standards program required(EPS), that sets CO2e emissions limits for nitrogen products based on a production weighted sectoral average. For facilities emitting more than 100,000 tonswhose carbon emissions exceed the applicable limits, compliance options included the purchase of GHGs per year to reduce emissions by 12% over such facilities' 2007 levels. To meet this requirement, companies could reduce emissions, purchase/use offset credits, or contribute toperformance units for a technology fund at an annual ratefee of $15CAD $20 per ton of excess CO2. e for calendar year 2019, which fee rises by CAD $10 per ton each year through 2022. Except for registration and recordkeeping provisions, the EPS has not yet gone into effect in Ontario and facilities in Ontario are subject to the federal OBPS. However, in September 2020, ECCC announced that the Ontario EPS met the federal government’s minimum stringency benchmark requirements, and the federal carbon pricing system will no longer apply in Ontario at a date to be set in consultation between ECCC and the Ontario government.
Beginning in 2018, our facility will becomeMedicine Hat Nitrogen Complex became subject to the Carbon Competitiveness Incentive Regulation which(CCIR). This regulation establishes product-specific benchmarks based on the most efficient GHG emittingGHG-emitting facilities in a sector. Similar to the existing regulation, aA facility with emissions that exceedsexceeded the applicable benchmark will bewas required to take action to reduce its GHG emissions intensity, purchase emissions offsets or performance credits, or make contributions to Alberta'sAlberta’s climate fund. In 2019, the Alberta government passed the Technology Innovation and Emission Reduction Implementation Act (TIER), which replaced the CCIR and went into effect on January 1, 2020. The obligations under this regulationTIER requires large emitting facilities (other than electricity producers, which are being phased in oversubject to a three year period anddifferent standard) to comply with the least stringent of a “facility-specific” benchmark of 90% of historical GHG emissions intensity from a three-year baseline, which intensity limit will be tightened over time.
reduced by 1% a year beginning in 2021, or a benchmark reflecting the emissions intensity of the top 10% of facilities for a given sector. The United States is not a partycompliance options under the TIER are similar to the Kyoto Protocol, but is a party tocompliance options under the Paris Agreement. However,CCIR, including initially establishing the price for payments into its carbon fund at CAD $30 per excess ton of emissions (the same effective price as set in June 2017, the United States announcedCCIR). The federal government had determined that Alberta’s CCIR meets its intention to withdraw fromstringency requirements and did not impose the Paris Agreement, subject to renegotiationOBPS in 2019. In December 2019, the federal government determined that the TIER also met the stringency requirements of the Paris Agreement on terms more favorableOBPS with respect to its regulation of large industrial emitters for 2020. The Alberta government has announced that it will increase the United States. Underlevy for excess emissions of CO2e from CAD $30 per ton in 2020 by CAD $10 per year, up to CAD $50 per ton in 2022, to match the termsprice of carbon established in the Paris Agreement, the United States cannot formally provide notice of its withdrawal before November 2019, which would become effective one year after providing such notice. In the interim, it is unclear if the United States will comply with its commitments under the Paris Agreement. There has been no indication to date that the United States' announced withdrawal is causing other countries to also consider withdrawing from the Paris Agreement. OBPS.
In the United States, GHG regulation is evolving at state, regional and federal levels, although some of the more significant developments to date, including EPA's Clean Power Plan,EPA’s efforts to regulate greenhouse gas emissions from fossil fuel-fired power plants, do not directly impose obligations on our facilities. The EPA has issued a mandatory GHG reporting rule that required all of our U.S. manufacturing facilities to commence monitoring GHG emissions beginning on January 1, 2010 and reportreporting the previous year'syear’s emissions annually starting in 2011. In addition, if we seek to modify or expand any of our major facilities and as a result, are required to obtain a Prevention of Significant Deterioration (PSD) construction permit applicable to such facilities, we could be subject to pollution control requirements applicable to GHGs in addition to requirements applicable to conventional air pollutants. Such requirements may result in increased costs or delays in completing such projects. Other than
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the states'states’ implementation of this permitting requirement, none of the states where our U.S. production facilities are located—Iowa,located-Iowa, Louisiana, Mississippi and Oklahoma—hasOklahoma-has proposed control regulations limiting GHG emissions.
On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement was accepted by the United States and ratified by Canada and the United Kingdom and went into effect in November 2016. The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5°C above pre-industrial levels. Each signatory is required to develop its own national plan to attain this objective. Increasing concern over the impacts of climate change is driving the signatories to establish even more ambitious GHG reduction targets. In December 2020, the United Kingdom announced a target to reduce GHG emission 68% from 1990 levels by 2030. The EU has announced a new target to reduce its GHG emission 55% below 1990 levels by 2030. On November 4, 2019, the United States submitted formal notice of its withdrawal from the Paris Agreement, which became effective on November 4, 2020, but on January 20, 2021, President Biden announced that the United States has rejoined the Paris Agreement. This will require the United States to submit its own national plan for reducing GHG emissions. Executive Orders issued by the Biden Administration, including in particular an executive order issued on January 27, 2021 focusing on climate change, evidence the Administration’s intent to undertake numerous initiatives in an effort to reduce GHG emissions, including promoting renewable energy development, limiting or prohibiting new oil and gas leases on federal lands, and in general, making climate change considerations a critical component of federal policy.
New Source Performance Standards for Nitric Acid Plants
We operate 14 nitric acid plants in the United States. On August 14, 2012, the EPA issued a final regulation revising air emission standards applicable to newly constructed, reconstructed or modified nitric acid plants. The regulations will apply to these plants if and when we undertake activities or operations that are considered modifications, including physical changes that would allow us to increase our production capacity at these plants. The regulations include certain provisions that could make it difficult for us to meet the limits on emissions of nitrogen oxides (NOx)(NOx) notwithstanding pollution controls we may add to our plants, and accordingly, the regulations could impact our ability to expand production at our existing plants. The EPA regulation did not include a limitation on emissions of nitrous oxide (a greenhouse gas).

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Regulatory Permits and Approvals
We hold numerous environmental and other governmental permits and approvals authorizing operations at each of our facilities. A decision by a government agency to deny or delay issuing a new or renewed regulatory material permit or approval, or to revoke or substantially modify an existing material permit or approval, could have a material adverse effect on our ability to continue operations at the affected facility. Any future expansion of our existing operations is also predicated upon securing the necessary environmental or other permits or approvals. More stringent environmental standards may impact our ability to obtain such permits. On December 15, 2016, the EPA re-designated the Greater Baton Rouge Nonattainment Area (BRNA),
Human Capital Resources
Our long-term success depends on our people. We are dedicated to creating a workplace where our Donaldsonville facility is located,employees are proud to attainment with the 2008 8-hour ozone standard. However, on October 26, 2015, the EPA published a more stringent national ambient air quality standard for ozone. The State of Louisiana has recommendedwork and grow and everyone feels empowered to the EPA that Baton Rouge be designated as nonattainment with the 2015 ozone standard. On December 20, 2017, the EPA notified the State of Louisiana that it intends to designate the Baton Rouge area as non-attainment for the 2015 ozone standard. On January 5, 2018, the EPA published notice of a public comment period with respect to the proposed attainment/non-attainment designations of certain air quality regions, including the Baton Rouge area. Such a classification (in the Baton Rouge area ordo their best work. We do this by investing in other areas where our manufacturing facilities are located) could result in more stringent air pollution emissions limitsextensive recruitment, training and professional development opportunities for our existing operationsemployees and would also subjectfostering diversity and inclusion in our facilities to more stringent requirements to obtain approvals for plant expansions, or could make it difficult to obtain such approvals.culture.
Employees
Employee Population. We employed approximately 3,000 employees at December 31, 2020, of which 66% were located in the United States, 20% in the United Kingdom, and 14% in Canada. As of December 31, 2017, we employed2020, 16% of our employees have worked for the Company more than 20 years, 16% of our employees have worked for the Company between 11 and 20 years, 27% of our employees have worked for the Company between 6 and 10 years, and 41% of our employees have worked at the Company for less than 6 years. Full-time employees represented approximately 2,900 full-time99% of our workforce as of December 31, 2020 and 100 part-time employees.approximately 15% were covered by a collective bargaining agreement. We supplement our workforce with contractors with specialized skill sets during periods of peak activity, such as during turnarounds and maintenance events.

Culture, Inclusion and Diversity. Our core values and their underlying principles reflect our commitment to a diverse and inclusive culture, treating one another with respect. During 2020, all of our employees engaged in training to learn to recognize and address the effects of unconscious bias by challenging assumptions; encouraging diversity of experience, opinion, and expression; and supporting a workplace culture that actively strives to be more inclusive. As of December 31, 2020, approximately 14% of our global workforce was female and 15% of the Company’s employees in managerial roles were female. Minorities represented approximately 14% of the Company’s U.S. workforce and 12% of our U.S. employees in managerial roles. In order to continue to improve the inclusiveness and diversity of our company and culture, our recently
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announced comprehensive ESG goals include goals to increase the representation of females and persons of color in senior leadership roles and to implement a program designed to increase the hiring and promotion of minority and female candidates.
Workforce Health and Safety. Operating in a safe and responsible manner is a core value and an integral part of what sets the Company apart. We believe that focusing on leading indicators - such as the behavioral safety practices we have incorporated into our annual incentive plan - to drive and measure activities that prevent and control safety incidents, results in our industry-leading safety record. As of December 31, 2020, our 12-month rolling average recordable incident rate (RIR) was 0.14 incidents per 200,000 work hours, and our total recordable injury count was four. For the year ended December 31, 2020, our days away, restricted or transferred (DART) incident rate was 0.03 injuries per 200,000 work hours, and our lost time incident rate was 0.00.
Response to COVID-19 Pandemic. During fiscal 2020, in response to the COVID-19 pandemic, we implemented safety precautions to protect the health and well-being of all of our employees, including the manufacturing workforce who operate our nitrogen manufacturing complexes and distribution facilities. See Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Overview of CF Holdings—Market Conditions and Current Developments—COVID-19 Pandemic, for a further discussion of the pandemic and the actions we have taken.
Talent Development. A core aspect of our culture is our commitment to identifying and developing talent to help employees accelerate growth and achieve their career goals. We invest in extensive assessment, training and professional development opportunities for our employees through a robust set of formal and informal programs, including targeted job movements, key experiences, and training, with an emphasis on creating a culture of inclusion. Leadership is the quality that drives our values and sets us apart. To help foster leadership, we have developed a set of leadership competencies that provide a common language for how to demonstrate leadership at every level of the organization. We view training and development programs as being a key part of succession planning, allowing us to grow a stronger company today and in the future.
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ITEM 1A.    RISK FACTORS.
In addition to the other information contained in this Annual Report on Form 10-K, you should carefully consider the factors discussed below before deciding to invest in any of our securities. These risks and uncertainties, individually or in combination, could materially and adversely affect our business, financial condition, results of operations and cash flows.
Market Risks
Our business is cyclical, resulting in periods of industry oversupply during which our business, financial condition, results of operations and cash flows tend to be negatively affected.
Historically, selling prices for our products have fluctuated in response to periodic changes in supply and demand conditions. Demand for nitrogen is affected by planted acreage, crop selection and fertilizer application rates, driven by population growth, orgross domestic product growth, changes in dietary habits and non-food use of crops, such as production of ethanol and other biofuels among other things. Demand also includes industrial uses of nitrogen, for example chemicalschemical manufacturing and emissions reductants such as diesel exhaust fluid (DEF). Supply is affected by available capacity and operating rates, raw material costs and availability, energy prices, government policies and global trade.
Periods of strong demand, high capacity utilization and increasing operating margins tend to stimulate global investment in production capacity. In recent years, fertilizer producers, including CF Holdings, have built new production facilities or expanded capacity of existing production assets, or announced plans to do so. The construction of new nitrogen fertilizer manufacturing capacity in the industry, plus improvements to increase output from the existing production assets, increase nitrogen supply availability and affect the balance of supply and demand. In recentcertain years, fertilizer producers, including CF Holdings, have built new production facilities or expanded capacity of existing production assets, or announced plans to do so. Globalglobal nitrogen fertilizer capacity has increased faster than global nitrogen fertilizer demand, creating a surplus of global nitrogen fertilizer capacity, leadingwhich led to lower nitrogen fertilizer selling prices.
Selling prices reached multi-year lows in 2016 and 2017. TheFor example, in the two-year period ended December 31, 2017, additional production capacity came on line and, at the same time, the average selling price for our products in 2017 was $207 per ton compared to $217 per ton in 2016, a decline of 5%declined 34%, andfrom $314 per ton in 2015 a decline of 31%.to $207 per ton in 2017.
Additional production capacity is expected to come on line over the next twelve months.12 months outside of North America. We cannot predict the extent to which the current oversupply environment,impact of this additional capacity. Also, global or local economic and financial conditions or changes in such conditions, or other factors may cause delays, cancellation or acceleration of other announced and/or ongoing projects. We also cannot predict the closures or operating rates of existing installed capacity.
Price fluctuations for our products result from changes in supply demand balances. The significantand demand. Significant price fluctuations we have experienced are also a symptomexperience could be symptoms of an oversupplied market in transition as new capacity ramps up, and production slows down or shuts down in high cost regions. Similarly, lower energy prices can spur increases in production in high cost regions, which would result in increased supply and pressure on selling prices. Additionally, trade flows adjust.  Importsadjust as imports into different regions of the world also impact the local supply and demand balances. If imports increase into an oversupplied region, lower prices in that region could result.
We expect the lower priced environment to continue until global supply and demand become more balanced through a combination of continued demand growth and supply reductions as producers respond to lower realized margins by taking higher cost production facilities off line.
During periods of industry oversupply, our financial condition, results of operations and cash flows tend to be affected negatively as the price at which we sell our products typically declines, resulting in possible reduced profit margins, write-downs in the value of our inventory and temporary or permanent curtailments of production. OurIn 2016 and 2017, our financial performance, credit ratings and the trading price for our common stock have beenwere negatively impacted by the lower selling prices resulting from the current global oversupply of nitrogen fertilizer.fertilizer; while in 2018 and 2019, we experienced increases in the average selling price for our products. In 2020, the average selling price for our products decreased 14% to $203 per ton compared to $235 per ton in 2019. The period of time that these oversupply conditions willcan persist and the degree to which they will impact our business, financial condition, results of operations and cash flows isare uncertain.
Our nitrogen products are global commodities, and we face intense global competition from other fertilizer producers.
We are subject to intense price competition from our competitors. Most fertilizers and related nitrogen products that we produce, such as industrial grade ammonium nitrate and DEF, are global commodities, with little or no product differentiation, and customers make their purchasing decisions principally on the basis of delivered price and, to a lesser extent, on customer service and product quality. As a consequence, conditions in the international market for nitrogen products significantly influence our operating results.
We compete with many producers, including state-owned and government-subsidized entities. Consolidation in the industry may increase the resources of several of our competitors. For example, in January 2018, our competitors Agrium Inc. and Potash Corporation of Saskatchewan Inc. completed their merger into the newly formed company Nutrien Ltd. Some of our competitors have greater total resources and are less dependent on earnings from fertilizer sales, which make them less vulnerable to industry downturns and better positioned to pursue new expansion and development opportunities. Furthermore, certain governments, in some cases as owners of some of our competitors, may be willing to accept lower prices and profitability on their products or subsidize production or consumption in order to support domestic employment or other political or social
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goals. Our competitive position could suffer to the

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extent we are not able to expand our own resources, either through investments in new or existing operations or through acquisitions, joint ventures or partnerships.
China, the world’s largest producer and consumer of nitrogen fertilizers, currently has significant capacity surplus and many high-cost plants. As a result, the domestic nitrogen industry in China is operating at less than full capacity. If Chinese government policy, devaluation of the Chinese renminbi, the relaxation of Chinese environmental standards or decreases in Chinese producers’ underlying costs such as the price of Chinese coal encourage increased production capacity utilization, any resulting export volume could adversely affect the balance between global supply and demand and may put downward pressure on global fertilizer prices, which could materially adversely affect our business, financial condition, results of operations and cash flows.    
Our competitors in Russia continue to benefit from non-market pricing of natural gas, allowing continued exports from the region, and have significant nitrogen fertilizer export capacity. The 2016 revocations of U.S. antidumping measures on solid urea and fertilizer grade ammonium nitrate from Russia allowhave allowed for increases in imports from that country.country into the United States in recent years.
We also face competition from other fertilizer producers in the Middle East, Europe, and Latin America and Africa, who, depending on market conditions, fluctuating input prices, geographic location and freight economics, may take actions at times with respect to price or selling volumes that adversely affect our business, financial condition, results of operations and cash flows.
In addition, the international market for nitrogen products is influenced by such factors as currency exchange rates, including the relative value of the U.S. dollar and its impact upon the cost of importing of nitrogen products into the United States, foreign agricultural policies, the existence of, or changes in, import or foreign currency exchange barriers in certain foreign markets and the laws and policies of the markets in which we operate, including the imposition of new duties, tariffs or quotas, that affect foreign trade and investment. For example, the imposition of duties, tariffs or quotas in a region can directly impact product pricing in that region, which can lead to changes in global trade flows and impact the global supply and demand balance and pricing. Market participants customarily move product between regions of the world, or adjust trade flows, in response to these factors. North America, where we manufacture and sell most of our products, is one of the largest and most liquid nitrogen trading regions in the world. As a result, other manufacturers, traders and other market participants can move nitrogen products to North America when there is uncertainty associated with the supply and demand balance in other regions or when duties, tariffs or quotas impact prices or trade flows in other regions. As a result, duties, tariffs and quotas can lead to uncertainty in the global marketplace and impact the supply and demand balance in many regions, which could adversely affect our business, financial condition, results of operations and cash flows. On October 9, 2019, the European Commission (the Commission) imposed definitive anti-dumping duties on imports to the European Union of UAN manufactured in Russia, the Republic of Trinidad and Tobago and the United States. For imports of UAN manufactured in the United States, the fixed duty rate is €29.48 per metric ton (or €26.74 per ton). The duties will remain in place for an initial five-year period, after which the measures may be renewed by the Commission. The long term impact of this duty on the international market for nitrogen products is uncertain.
A decline in agricultural production or limitations on the use of our products for agricultural purposes could materially adversely affect the demand for our products.
Conditions in the United States, Europe, India, Brazil, China and other global agricultural areas significantly impact our operating results. Agricultural planted areas and production can be affected by a number of factors, including weather patterns and field conditions, current and projected grain inventories and prices, crop disease and/or livestock disease, demand for agricultural products and governmental policies regarding production of or trade in agricultural products. These factors are outside of our control.
Governmental policies, including farm and biofuel subsidies, and commodity support programs and tariffs, as well as the prices of fertilizer products, may also directly or indirectly influence the number of acres planted, the mix of crops planted and the use of fertilizers for particular agricultural applications. Ethanol production in the United States contributes significantly to corn demand, representing approximately 35% of total U.S. corn demand, due in part to federal legislation mandating use of renewable fuels. An increase in ethanol production has led to an increase in the amount of corn grown in the United States and to increased fertilizer usage on both corn and other crops that have also benefited from improved farm economics. While the current Renewable Fuel Standard (RFS) encourages continued high levels of corn-based ethanol production, a continuing “food versus fuel” debate and other factorsvarious interested parties have resulted in callscalled to eliminate or reduce the renewable fuel mandate, or to eliminate or reduce corn-based ethanol as part of the renewable fuel mandate. Other factors that drive the ethanol market include the prices of ethanol, gasoline and corn. Lower gasoline prices and fewer aggregate miles, driven by increased automobile fuel efficiency or the continued expansion of electric
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vehicles, may put pressure on ethanol prices that could result in reduced profitability and lower production for the ethanol industry. This could have an adverse effect on corn-based ethanol production, planted corn acreage and fertilizer demand.
Developments in crop technology, such as nitrogen fixation, the conversion of atmospheric nitrogen into compounds that plants can assimilate, or nitrogen-efficient varieties, or developments in alternatives to traditional animal feed or alternative proteins, could also reduce the use of chemical fertilizers and adversely affect the demand for our products. Widespread adoption of emerging application technologies or alternative farming techniques could disrupt traditional application practices, affecting the volume or types of products used and timing of applications. In addition, from time to time various foreign government and U.S. state legislatures have considered limitations on the use and application of chemical fertilizers due to concerns about the impact of these products on the environment. For example, the United Kingdom is currently consulting with stakeholders and reviewing proposals to limit emissions from solid urea fertilizers, including a potential ban on urea fertilizers. While CF Fertilisers UK Limited does not sell solid urea fertilizer in the United Kingdom, other jurisdictions may consider limits on fertilizer use, such as the European Union, which announced its Farm to Fork and Biodiversity Strategies. Any reduction in the demand for chemical fertilizer products, including any limitationas a result of technological developments and/or limitations on the use and application of chemical fertilizer, could affect the demand for our products, whichfertilizers, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Our business is dependent on natural gas, the prices of which are subject to volatility.
NaturalNitrogen from the atmosphere and hydrogen from natural gas, iscoal and other carbon energy feedstocks, or from the electrolysis of water, are the fundamental building blocks of nitrogen fertilizers. Energy feedstock costs comprise a significant portion of the total production cost of nitrogen products and, relative to the industry’s marginal producers that set the global price of nitrogen, generally determine profitability for nitrogen producers. Our manufacturing processes utilize natural gas as the principal raw material used to producein our production of nitrogen fertilizers. We use natural gas both as a chemical feedstock and as a fuel to produce ammonia, granular urea, urea ammonium nitrate solution (UAN), ammonium nitrate (AN) and other nitrogen products.
Because mostMost of our nitrogen fertilizer manufacturing facilities are located in the United States and Canada,Canada. As a result, North American natural gas comprises a significant portion of the total production cost of our products. In recent years, the cost of North American natural gas for the production of nitrogen fertilizers has been significantly lower than the energy costs of the industry’s marginal nitrogen producers. Changes in the supply of and demand for natural gas can lead to extended periods of higher natural gas prices. If high natural gas prices were to persist in North America and significantly erode our favorable energy cost differentials relative to the marginal nitrogen producers, it could have a material adverse effect on our business, financial condition, results of operations and cash flows.
The price of natural gas in North America has been volatile in recent years. During 2017,2020, the daily closing price at the Henry Hub, the most heavily-traded natural gas pricing point in North America, reached a low of $2.44$1.34 per MMBtu on February 28, 2017September 22, 2020 and three consecutive days in October and a high of $3.65$3.08 per MMBtu on three consecutive days in January 2017.October 27, 2020. During the three-year period ended December 31, 2017,2020, the daily closing price at the Henry Hub reached a low of $1.49$1.34 per MMBtu on September 22, 2020 and three consecutive days in March 2016October 2020 and a high of $3.77$6.88 per MMBtu on December 8, 2016.January 4, 2018.
We also have manufacturing facilities located in the United Kingdom. These facilities are subject to fluctuations associated with the price of natural gas in Europe.Europe, which has also been volatile in recent years. The major natural gas trading point for the United Kingdom is the National

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Balancing Point.Point (NBP). During 2017,2020, the daily closing price at NBP reached a low of $3.30$1.04 per MMBtu on June 15, 2017May 22, 2020 and a high of $9.00$7.71 per MMBtu on December 12, 2017.30, 2020. During the three-year period ended December 31, 2017,2020, the daily closing price at NBP reached a low of $2.80$1.04 per MMBtu on September 1, September 12 and September 14, 2016May 22, 2020 and a high of $9.00$31.74 per MMBtu on December 12, 2017.
Changes in the supply of and demand for natural gas can lead to periods of volatile natural gas prices. If high prices were to occur during a period of low fertilizer selling prices, it could have a material adverse effect on our business, financial condition, results of operations and cash flows.March 2, 2018.
The price of natural gas in North America and worldwide has been volatile in recent years and has declined on average due in part to the development of significant natural gas reserves, including shale gas, and the rapid improvement in shale gas extraction techniques, such as hydraulic fracturing and horizontal drilling. Future production of natural gas from shale formations could be reduced by regulatory changes that restrict drilling or hydraulic fracturing or increase its cost or by reduction in oil exploration and development prompted by lower oil prices and resulting in production of less associated gas.
Certain of our operating facilities are located near natural gas hubs that have experienced increased natural gas development and have favorable basis differences as compared to other North American hubs. Favorable basis differences in certain regions may dissipate over time due to increases in natural gas pipeline or storage capacity in those regions. Additionally, increasedbasis differentials may become materially unfavorable due to a lack of inbound gas pipeline or storage capacity in other regions during periods of unusually high demand. Increased demand for natural gas, particularly in the Gulf Coast Region, due to increased industrial demand and increased natural gas exports, could result in increased natural gas prices. If such reduced production, or increased demand or changes in basis were to occur, or if other developments adversely impact the supply/
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supply and demand balance for natural gas in the United StatesNorth America or elsewhere, natural gas prices could rise, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Adverse weather conditions may decrease demand for our fertilizer products, increase the cost of natural gas or materially disrupt our operations.
Weather conditions that delay or disrupt field work during the planting, growing, harvesting or application periods may cause agricultural customers to use different forms of nitrogen fertilizer, which may adversely affect demand for the forms that we sell or may impede farmers from applying our fertilizers until the following application period, resulting in lower seasonal demand for our products.
Adverse weather conditions during or following harvest may delay or eliminate opportunities to apply fertilizer in the fall. Weather can also have an adverse effect on crop yields, which could lower the income of growers and impair their ability to purchase fertilizer from our customers. Adverse weather conditions could also impact transportation of fertilizer, which could disrupt our ability to deliver our products to customers on a timely basis. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in fertilizer applications, planting schedules and purchasing patterns. Over the longer-term, changes in weather patterns may shift the periods of demand for products and even the regions to which our products are distributed, which could require us to evolve our distribution system.
In addition, we use the North American waterway system extensively to ship products from some of our manufacturing facilities to our distribution facilities and our customers, and we also export nitrogen fertilizer products via seagoing vessels from deep-water docking facilities at certain of our manufacturing sites. Therefore, persistent significant changes in river or ocean water levels (either up or down, such as a result of flooding or drought for example), may require changes to our operating and distribution activities and/or significant capital improvements to our facilities.
Weather conditions or, in certain cases, weather forecasts, also can disrupt our operations and thosecan affect the price of natural gas, the principal raw material used to make our nitrogen fertilizer products. Colder and/or longer than normal winters and warmer than normal summers increase the demand for natural gas for power generation and for residential and industrial use, which can increase the cost and/or decrease the availability of natural gas. In addition, adverse weather events can not only cause loss of power at our facilities disrupting our operations, but also can impact the supply of natural gas and utilities and cause prices to rise.
Our operating results fluctuate due to seasonality. Our inability to predict future seasonal fertilizer demand accurately could result in our having excess inventory, potentially at costs in excess of market value.
The fertilizer business is seasonal. The degree of seasonality of our joint venturebusiness can change significantly from year to year due to conditions in the agricultural industry and other factors. The strongest demand for our products in North America occurs during the spring planting season, with a second period of strong demand following the fall harvest. In contrast, we and other fertilizer producers generally manufacture and distribute products throughout the year. As a result, we and/or our customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application seasons and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in our sales volumes and net sales being the highest during the spring and our working capital requirements being the highest just prior to the start of the spring planting season.
If seasonal demand is less than we expect, we may be left with excess inventory that will have to be stored (in which case our results of operations would be negatively affected by any related increased storage costs) or liquidated (in which case the selling price could be below our production, procurement and storage costs). The risks associated with excess inventory and product shortages are exacerbated by the volatility of nitrogen fertilizer prices and the relatively brief periods during which farmers can apply nitrogen fertilizers. If prices for our products rapidly decrease, we may be subject to inventory write-downs, adversely affecting our operating results.
A change in the volume of products that our customers purchase on a forward basis, or the percentage of our sales volume that is sold to our customers on a forward basis, could increase our exposure to fluctuations in our profit margins and materially adversely affect our business, financial condition, results of operations and cash flows.
We offer our customers the opportunity to purchase products from us on a forward basis at prices and delivery dates we propose. Under our forward sales programs, customers generally make an initial cash down payment at the time of order and pay the remaining portion of the contract sales value in advance of the shipment date. Forward sales improve our liquidity by reducing our working capital needs due to the cash payments received from customers in advance of shipment of the product
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and allow us to improve our production scheduling and planning and the utilization of our manufacturing and distribution assets.
Any cash payments received in advance from customers in connection with forward sales are reflected on our consolidated balance sheets as a current liability until the related orders are shipped, which can take up to several months.
We believe the ability to purchase products on a forward basis is most appealing to our customers during periods of generally increasing prices for nitrogen fertilizers. Our customers may be less willing or even unwilling to purchase products on a forward basis during periods of generally decreasing or stable prices or during periods of relatively high fertilizer prices due to the expectation of lower prices in the future or limited capital resources. In periods of rising fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in lower profit margins than if we had not sold fertilizer on a forward basis. Conversely, in periods of declining fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in higher profit margins than if we had not sold fertilizer on a forward basis. In addition, fixing the selling prices of our products, often months in advance of their ultimate delivery to customers, typically causes our reported selling prices and margins to differ from spot market prices and margins available at the time of shipment.
Operational Risks
Our operations are dependent upon raw materials provided by third parties, and any delay or interruption in the delivery of raw materials may adversely affect our business.
We and our joint venture use natural gas and other raw materials in the manufacture of nitrogen products. We purchase the natural gas and other raw materials from third party suppliers. Our natural gas is transported by pipeline to our facilities and those of our joint venture by third party transportation providers or through the use of facilities owned by third parties. Delays or interruptions in the delivery of natural gas or other raw materials may be caused by, among other things, severe weather or natural disasters, unscheduled downtime, labor difficulties, insolvency of our suppliers or their inability to meet existing contractual arrangements, deliberate sabotage and terrorist incidents, or mechanical failures. Our joint venture, Point Lisas Nitrogen Limited, has experienced numerous natural gas curtailments as discussed in the risk factor below titled "We are exposed to risks associated with our joint venture." In addition, the transport of natural gas by pipeline is subject to additional risks, including delays or interruptions caused by capacity constraints, leaks or ruptures. Any delay or interruption in the delivery of natural gas or other raw materials, even for a limited period, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Our transportation and distribution activities rely on third party providers and are subject to environmental, safety and regulatory oversight. This exposes us to risks and uncertainties beyond our control that may adversely affect our operations and exposes us to additional liability.
We rely on railroad, truck, pipeline, river barge and ocean vessel companiesnatural gas pipelines to transport raw materials to our manufacturing facilities,facilities. In addition, we rely on railroad, barge, truck, vessel and pipeline companies to coordinate and deliver finished products to our distribution system and to ship finished products to our customers. We also lease rail cars in order to ship raw materials and finished products. These transportation operations, equipment and services are subject to various hazards, including adverse operating conditions on the inland waterway system, extreme weather conditions, system failures, work stoppages, shutdowns, delays, accidents such as spills and derailments, vessel groundings and other accidents and operating hazards. Additionally, due to the aging infrastructure of certain rail lines, bridges, roadways, rail lines,pipelines, river locks, and equipment that our third party service providers utilize, we may experience delays in both the receipt of raw materials or the shipment of finished product while repairs, maintenance or replacement activities are conducted. Also, certain third party service providers, particularlysuch as railroads, have experienced periodic service slowdownsdelays or shutdowns due to capacity constraints in their systems, operational and maintenance difficulties, blockades, weather or safety-related embargoes and delays, and other events, which could impact the shipping times of our products.products and cause disruption in our supply chain.
These transportation operations, equipment and services are also subject to environmental, safety, and regulatory oversight. Due to concerns related to accidents, discharges or other releases of hazardous substances, terrorism or the potential use of fertilizers as explosives, governmental entities could implement new or more stringent regulatory requirements affecting the transportation of raw materials or finished products.
If shipping of our products is delayed or we are unable to obtain raw materials as a result of these transportation companies’ failure to operate properly, or if new and more stringent regulatory requirements arewere implemented affecting transportation operations or equipment, or if there arewere significant increases in the cost of these services or equipment, our revenues and cost of operations could be adversely affected. In addition, increases in our transportation costs, or changes in

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such costs relative to transportation costs incurred by our competitors, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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In the United States and Canada, the railroad industry continues various efforts to limit the railroads’ potential liability stemming from the transportation of Toxic Inhalation Hazard materials, such as the anhydrous ammonia we transport to and from our manufacturing and distribution facilities. For example, various railroads shift liability to shippers by contract, purport to shift liability to shippers by tariff, or otherwise seek to require shippers to indemnify and defend the railroads from and against liabilities (including in negligence, strict liability, or statutory liability) that may arise from certain acts or omissions of the railroads, third parties withwho may have insufficient resources, or the Company, unknown causes or acts of god. These initiatives could materially and adversely affect our operating expenses and potentially our ability to transport anhydrous ammonia and increase our liability for releases of our anhydrous ammonia while in the care, custody and control of the railroads, or third parties or us, for which our insurance may be insufficient or unavailable. New or more stringent regulatory requirements also could be implemented affecting the equipment used to ship our raw materials or finished products. Restrictions on service, increases in transportation costs, or changes in such costs relative to transportation costs incurred by our competitors, and any railroad industry initiatives that may impact our ability to transport our products, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
We are subject to risks relating to our information technology systems, and any technology disruption or cybersecurity incident could negatively affect our operations.
We rely on internal and third-party information technology and computer control systems in many aspects of our business, including internal and external communications, the management of our accounting, financial and supply chain functions and plant operations. If we do not allocate and effectively manage the resources necessary to build and sustain the proper technology infrastructure, we could be subject to transaction errors, processing inefficiencies, the loss of customers, business disruptions, or the loss of or damage to our confidential business information due to a security breach. In addition, our information technology systems may be damaged, disrupted or shut down due to attacks by computer hackers, computer viruses, employee error or malfeasance, power outages, hardware failures, telecommunication or utility failures, catastrophes or other unforeseen events, and in any such circumstances our system redundancy and other disaster recovery planning may be ineffective or inadequate. Security breaches of our systems (or the systems of our customers, suppliers or other business partners) could result in the misappropriation, destruction or unauthorized disclosure of confidential information or personal data belonging to us or to our employees, business partners, customers or suppliers, and may subject us to legal liability.
As with most large systems, our information technology systems have in the past been, and in the future likely will be, subject to computer viruses, malicious codes, unauthorized access and other cyber attacks, and we expect the sophistication and frequency of such attacks to continue to increase. To date, we are not aware of any significant impact on our operations or financial results from such attempts; however, unauthorized access could disrupt our business operations, result in the loss of assets, and have a material adverse effect on our business, financial condition, or results of operations. Any of the attacks, breaches or other disruptions or damage described above could: interrupt our operations at one or more sites; delay production and shipments; result in the theft of our and our customers’ intellectual property and trade secrets; damage customer and business partner relationships and our reputation; result in legal claims and proceedings, liability and penalties under privacy or other laws, or increased costs for security and remediation; or raise concerns regarding our accounting for transactions. Each of these consequences could adversely affect our business, reputation and our financial statements.
Our business involves the use, storage, and transmission of information about our employees, customers, and suppliers. The protection of such information, as well as our proprietary information, is critical to us. The regulatory environment surrounding information security and privacy is increasingly demanding, with the frequent imposition of new and constantly changing requirements. We have established policies and procedures to help protect the security and privacy of this information. Breaches of our security measures or the accidental loss, inadvertent disclosure, or unapproved dissemination of proprietary information or sensitive or confidential data about us or our employees, customers or suppliers, including the potential loss or disclosure of such information or data as a result of fraud, trickery, or other forms of deception, could expose us or our employees, customers, suppliers or other individuals affected to a risk of loss or misuse of this information, which could ultimately result in litigation and potential legal and financial liability. These events could also damage our reputation or otherwise harm our business.
We are reliant on a limited number of key facilities.
Our nitrogen fertilizer operations are located at nine separate nitrogen complexes, the largest of which is the Donaldsonville complex, which represented approximately 40% of our ammonia production capacity as of December 31, 2020. The suspension of operations at any of these complexes could adversely affect our ability to produce our products and fulfill our commitments, and could have a material adverse effect on our business, financial condition, results of operations and cash flows. Operational disruptions could occur for many reasons, including natural disasters, weather, unplanned maintenance and other manufacturing problems, disease, strikes or other labor unrest or transportation interruptions. For example, our
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Donaldsonville complex is located in an area of the United States that experiences a relatively high level of hurricane or high wind activity and several of our complexes are located in areas that experience severe weather. Such storms, depending on their severity and location, have the potential not only to damage our facilities and disrupt our operations, but also to affect adversely the shipping and distribution of our products. Moreover, our facilities may be subject to failure of equipment that may be difficult to replace or have long delivery lead times, due in part to a limited number of suppliers, and could result in operational disruptions.
Acts of terrorism and regulations to combat terrorism could negatively affect our business.
Like other companies with major industrial facilities, we may be targets of terrorist activities. Many of our plants and facilities store significant quantities of ammonia and other materials that can be dangerous if mishandled. Any damage to infrastructure facilities, such as electric generation, transmission and distribution facilities, or injury to employees, who could be direct targets or indirect casualties of an act of terrorism, may affect our operations. Any disruption of our ability to produce or distribute our products could result in a significant decrease in revenues and significant additional costs to replace, repair or insure our assets, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Due to concerns related to terrorism or the potential use of certain fertilizers as explosives, we are subject to various security laws and regulations. In the United States, these security laws include the Maritime Transportation Security Act of 2002 and the Chemical Facilities Anti-Terrorism Standards regulation. In addition, President Obama issued in 2013 Executive Order 13650 Improving Chemical Facility Safety and Security to improve chemical facility safety in coordination with owners and operators. Governmental entities could implement new or impose more stringent regulations affecting the security of our plants, terminals and warehouses or the transportation and use of fertilizers. These regulations could result in higher operating costs or limitations on the sale of our products and could result in significant unanticipated costs, lower revenues and reduced profit margins. We manufacture and sell certain nitrogen products that can be used as explosives. It is possible that governmental entities in the United States or elsewhere could impose additional limitations on the use, sale or distribution of nitrogen products, thereby limiting our ability to manufacture or sell those products, or that illicit use of our products could result in liability for us.
We are subject to risks associated with international operations.
Our international business operations are subject to numerous risks and uncertainties, including difficulties and costs associated with complying with a wide variety of complex laws, treaties and regulations; unexpected changes in regulatory environments; currency fluctuations; tax rates that may exceed those in the United States; earnings that may be subject to withholding requirements; and the imposition of tariffs, exchange controls or other restrictions.
Changes in governmental trade policies can lead to the imposition of new taxes, levies, duties, tariffs or quotas affecting agricultural commodities, fertilizer or industrial products. These can alter costs, trade flows, access to supplies or demand, and regional balances for our products.
Our principal reporting currency is the U.S. dollar and our business operations and investments outside the United States increase our risk related to fluctuations in foreign currency exchange rates. The main currencies to which we are exposed, besides the U.S. dollar, are the Canadian dollar, the British pound and the euro. These exposures may change over time as business practices evolve and economic conditions change. We may selectively reduce some foreign currency exchange rate risk by, among other things, requiring contracted purchases of our products to be settled in, or indexed to, the U.S. dollar or a currency freely convertible into U.S. dollars, or hedging through foreign currency derivatives. These efforts, however, may not be effective and could have a material adverse effect on our business, financial condition, results of operations and cash flows.
We are subject to anti-corruption laws and regulations and economic sanctions programs in various jurisdictions, including the U.S. Foreign Corrupt Practices Act of 1977, the United Kingdom Bribery Act of 2010, the Canadian Corruption of Foreign Public Officials Act, and economic sanctions programs administered by the United Nations, the European Union and the Office of Foreign Assets Control of the U.S. Department of the Treasury, and regulations set forth under the Comprehensive Iran Accountability Divestment Act. As a result of doing business internationally, we are exposed to a risk of violating anti-corruption laws and sanctions regulations applicable in those countries where we, our partners or agents operate. Violations of anti-corruption and sanctions laws and regulations are punishable by civil penalties, including fines, denial of export privileges, injunctions, asset seizures, debarment from government contracts (and termination of existing contracts) and revocations or restrictions of licenses, as well as criminal fines and imprisonment. The violation of applicable laws by our employees, consultants, agents or partners could subject us to penalties and could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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We are subject to antitrust and competition laws in various countries throughout the world. We cannot predict how these laws or their interpretation, administration and enforcement will change over time. Changes in antitrust laws globally, or in their interpretation, administration or enforcement, may limit our existing or future operations and growth.
Financial Risks
Our operations and the production and handling of our products involve significant risks and hazards. We are not fully insured against all potential hazards and risks incident to our business. Therefore, our insurance coverage may not adequately cover our losses.
Our operations are subject to hazards inherent in the manufacture, transportation, storage and distribution of chemical products, including ammonia, which is highly toxic and corrosive. These hazards include: explosions; fires; severe weather and natural disasters; train derailments, collisions, vessel groundings and other transportation and maritime incidents; leaks and ruptures involving storage tanks, pipelines and rail cars; spills, discharges and releases of toxic or hazardous substances or gases; deliberate sabotage and terrorist incidents; mechanical failures; unscheduled plant downtime; labor difficulties and other risks. Some of these hazards can cause bodily injury and loss of life, severe damage to or destruction of property and equipment and environmental damage, and may result in suspension of operations andfor an extended period of time and/or the imposition of civil or criminal penalties and liabilities.
We maintain property, business interruption, casualty and liability insurance policies, but we are not fully insured against all potential hazards and risks incident to our business. If we were to incur significant liability for which we were not fully insured, it could have a material adverse effect on our business, financial condition, results of operations and cash flows. We are subject to various self-retentions,self-insured retentions, deductibles and limits under these insurance policies. The policies also contain exclusions and conditions that could have a material adverse impact on our ability to receive indemnification thereunder. Our policies are generally renewed annually. As a result of market conditions, our premiums, self-retentionsself-insured retentions and deductibles for certain insurance policies can increase substantially and, in some instances, certain insurance may become unavailable or available only for reduced amounts of coverage. In addition, significantly increased costs could lead us to decide to reduce, or possibly eliminate, coverage. There can be no assurance that we will be able to buy and maintain insurance with adequate limits and reasonable pricing terms and conditions.
In April 2013, there was a fire and explosion at the West Fertilizer Co. fertilizer storage and distribution facility in West, Texas. According to published reports, 15 people were killed and approximately 200 people were injured in the incident, and the fire and explosion damaged or destroyed a number of homes and buildings around the facility. Various subsidiaries of CF Industries Holdings, Inc. (the CF Entities) have beenwere named as defendants along with other companies in lawsuits filed in 2013, 2014 and 2015 in the District Court of McLennan County, Texas by the City of West, individual residents of the County and other parties seeking recovery for damages allegedly sustained as a result of the explosion. The cases have beenwere consolidated for discovery and pretrial proceedings in the District Court of McLennan County under the caption “In re: West Explosion Cases.” The two-year statute of limitations expired on April 17, 2015. As of that date, over 400 plaintiffs had filed claims, including at least 9 entities, 325 individuals, and 80 insurance companies. Plaintiffs allege various theories of negligence, strict liability, and breach of warranty under Texas law. Although we do not own or operate the facility or directly sell our products to West Fertilizer Co., products that the CF Entities have manufactured and sold to others have beenwere delivered to the facility and may have been stored at the West facility at the time of the incident. The Court granted in part and denied in part the CF Entities’ Motions for Summary Judgment in August 2015. Over onethree hundred sixty cases have been resolved pursuant to confidential settlements that have been or we expect will be fully funded by insurance. The remaining cases are in various stages of discovery and pre-trial proceedings. The next trialgroup of cases is expected to be scheduledset for later in 2018.trial after the Court resumes scheduling civil jury trials currently on hold because of the outbreak of coronavirus disease 2019 (COVID-19) pandemic. We believe we have strong legal and factual defenses and intend to continue defending the CF Entities vigorously in the pending lawsuits. The increased focus on the risks associated with fertilizers as a result of the incident could impact the regulatory environment and requirements applicable to fertilizer manufacturing and storage facilities.

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Our substantial indebtedness could adversely affect our cash flow, prevent us from fulfilling our obligations and impair our ability to pursue or achieve other business objectives.
As of December 31, 2017,2020, we had approximately $4.69$4.0 billion of total funded indebtedness, consisting primarily of secured and unsecured senior notes with varying maturity dates between 20202021 and 2044, or approximately 41%40% of our total capitalization, and an additional $695$750 million of senior secured borrowing availability (reflecting no outstanding borrowings and $55 million ofno outstanding letters of credit) for general corporate purposes under our senior secured revolving credit agreement (as amended, the Revolving Credit Agreement). Our substantial debt service obligations will have an impact on our earnings and cash flow for so long as the indebtedness is outstanding.
Our substantial indebtedness could, as a result of our debt service obligations or through the operation of the financial and other restrictive covenants to which we are subject under the agreements and instruments governing that indebtedness and otherwise, have important consequences. For example, it could:
make it more difficult for us to pay or refinance our debts as they become due during adverse economic and industry conditions because any related decrease in revenues could cause us not to have sufficient cash flows from operations to make our scheduled debt payments;
cause us to be less able to take advantage of significant business opportunities, such as acquisition opportunities, and to react to changes in market or industry conditions;
cause us to use a portion of our cash flow from operations for debt service, reducing the availability of cash to fund working capital and capital expenditures, and other business activities;
cause us to be more vulnerable to general adverse economic and industry conditions;
expose us to the risk of increased interest rates because certain of our borrowings, including borrowings under our Revolving Credit Agreement, could be at variable rates of interest;
make us more leveraged than some of our competitors, which could place us at a competitive disadvantage;
restrict our investments in our subsidiaries, which could limit our ability to fund certain of our businesses;
restrict our ability to dispose of assets or otherwise restrict our use of funds from the disposal of assets;
restrict our ability to pay dividends on our common stock or utilize excess cash to repurchase shares of our common stock;
limit our ability to borrow additional monies in the future to fund working capital, capital expenditures and other general corporate purposes; and
result in a downgrade in the credit rating of our indebtedness which could increase the cost of further borrowings.
We expect to consider options to refinance our outstanding indebtedness from time to time. Our ability to obtain any financing, whether through the issuance of new debt securities or otherwise, and the terms of any such financing are dependent on, among other things, our financial condition, financial market conditions within our industry and generally, credit ratings and numerous other factors, including factors beyond our control. Consequently, in the event that we need to access the credit markets, including to refinance our debt, there can be no assurance that we will be able to obtain financing on acceptable terms or within an acceptable timeframe, if at all. An inability to obtain financing with acceptable terms when needed could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Our Revolving Credit Agreement and the terms of our outstanding indebtedness impose significant operating and financial restrictions on us and our subsidiaries, which may prevent us from capitalizing on business opportunities.
Our Revolving Credit Agreement imposes significant operating and financial restrictions on us. These restrictions include covenants limiting our ability and the ability of our subsidiaries (other than certain excluded subsidiaries) to, among other things:
incur additional indebtedness or guarantee indebtedness;
pay dividends on, repurchase or make distributions in respect of their capital stock or make other restricted payments;
make certain investments or acquisitions;
sell, transfer or otherwise convey certain assets;
create liens;
consolidate, merge, sell or otherwise dispose of all or substantially all of our and our restricted subsidiaries’ assets; and
prepay certain kinds of indebtedness.
In addition, our Revolving Credit Agreement requires us to comply with consolidated interest coverage ratio, total debt to capital ratio, and consolidated secured leverage ratio maintenance covenants.


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Certain of these restrictions could be suspended if and for so long as we satisfy certain investment grade corporate rating and consolidated leverage tests. However, we cannot assure you that we will meet these tests or, if we do, that we will be able to maintain compliance with those conditions.
As a result of these restrictions and covenants under our existing indebtedness, including our senior secured notes, we are limited as to how we conduct our business and we may be unable to raise additional debt financing to compete effectively or to take advantage of new business opportunities. The terms of any future indebtedness we may incur could include additional or more restrictive covenants. We cannot assure you that we will be able to maintain compliance with the covenants under the terms of our indebtedness or, if we fail to do so, that we will be able to obtain waivers from the lenders and/or amend such covenants.
We may incur additional indebtedness in the future.
The terms of our existing indebtedness allow us to incur significant additional debt in the future, including additional secured and unsecured indebtedness. The indentures governing our senior secured notes do not limit incurrence by us of additional unsecured indebtedness, and will permit us to incur additional secured indebtedness subject to certain restrictions. Although our Revolving Credit Agreement contains restrictions on our ability to incur additional secured and unsecured indebtedness, these restrictions are subject to exceptions and qualifications, which allow us to incur additional secured and unsecured indebtedness in limited amounts.future. If we incur additional indebtedness, the risks that we face as a result of our leverage could intensify. If our financial condition or operating results deteriorate, our relations with our creditors, including the holders of our outstanding debt securities, the lenders under our Revolving Credit Agreement and our suppliers, may be materially and adversely affected.
A failure to satisfy the financial maintenance covenants under our Revolving Credit Agreement or a breach of the covenants under any of the agreements governing our indebtedness could limit the borrowing availability under our Revolving Credit Agreement or result in an event of default under such agreements.
Our ability to comply with the covenants in the agreements and instruments governing our indebtedness, including the consolidated interest coverage ratio and consolidated net leverage ratio maintenance covenants contained in our Revolving Credit Agreement, will depend upon our future performance and various other factors, such as market prices for our nitrogen products, natural gas prices and other business, competitive and regulatory factors, many of which are beyond our control. We may not be able to maintain compliance with all of these covenants. In that event, we may not be able to access the borrowing availability under our Revolving Credit Agreement and we would need to seek an amendment to our debt agreements or would need to refinance our indebtedness. There can be no assurance that we can obtain future amendments or waivers of our debt agreements and instruments, or refinance our debt, and, even if we were able to do so, such relief might only last for a limited period, potentially necessitating additional amendments, waivers or refinancings. Any noncompliance by us with the covenants under our debt agreements and instruments could result in an event of default under those debt agreements and instruments. An event of default under an agreement or instrument governing any of our indebtedness may allow our creditors to accelerate the
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related debt and may result in the acceleration of any other debt to which a cross-acceleration or cross-default provision applies. If our lenders or holders of our debt securities accelerate the repayment of borrowings, we may be forced to liquidate certain assets to repay all or part of our indebtedness, which could materially and adversely impair our business operations. An event of default under our Revolving Credit Agreement would permit the lenders thereunder to terminate all commitments to extend further credit under our Revolving Credit Agreement. Furthermore, our Revolving Credit Agreement and senior secured notes provide for liens on specified collateral to secure our obligations thereunder, and if we were unable to repay amounts due and payable under our Revolving Credit Agreement or the senior secured notes, our Revolving Credit Agreement lenders or holders of the senior secured notes, as applicable, could proceed against the collateral granted to them, which could have a material adverse effect on our business, financial condition and results of operations. In the event our creditors accelerate the repayment of our indebtedness, we cannot assure that we would have sufficient assets to make such repayment.
Potential future downgrades of our credit ratings could adversely affect our access to capital, cause vendors to change their credit terms for doing business with us, and could otherwise have a material adverse effect on us.
As of February 15, 2018,16, 2021, our corporate credit rating by S&P Global Ratings (S&P) is BB+ with a negativestable outlook; our corporate credit rating by Moody'sMoody’s Investor Services, Inc. (Moody's) is Ba2Ba1 with a stable outlook; and our corporate credit rating with Fitch Ratings, Inc. (Fitch) is BB+ with a negativestable outlook.
These ratings and our current credit condition affect, among other things, our ability to access new capital, especially debt, and negativeas well as the payment terms that vendors are willing to provide us. Negative changes in these ratings may result in more stringent covenants and higher interest rates under the terms of any new debt. Ourdebt, and could cause vendors to shorten our payment terms, require us to pay in advance for materials or services, or provide letters of credit, ratings were downgraded in 2016 and rating agencies could further downgrade oursecurity, or other credit ratings or issue adverse commentaries in the future, which could have a material adverse effect on our business, results of operations, financial condition and liquidity. In particular, a weakening of our financial condition, including a significant increase in our leverage or decrease in our profitability or cash flows, could adversely affect our ability to obtain necessary funds, result in a credit rating downgrade or change in outlook, or otherwise increase our cost of borrowing.

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Cyber security risks could result in disruptions in business operations and adverse operating results.
We rely on information technology and computer control systems in many aspects of our business, including internal and external communications, the management of our accounting, financial and supply chain functions and plant operations. Business and supply chain disruptions, plant and utility outages and information technology system and network disruptions due to cyber attacks could seriously harm our operations and materially adversely affect our operating results. Cyber security risks include attacks on information technology and infrastructure by hackers, damage or loss of information due to viruses, the unintended disclosure of confidential information, the misuse or loss of control over computer control systems, and breaches due to employee error. Our exposure to cyber security risks includes exposure through third parties on whose systems we place significant reliance for the conduct of our business. We routinely review and implement security procedures and measuresenhancements in order to protect our systems and information from being vulnerable to evolving cyber attacks. We believe these measures and procedures are appropriate. However, we may not have the resources or technical sophistication to anticipate, prevent, or recover from rapidly evolving types of cyber attacks. Compromises to our information and control systems could have severe financial and otherdo business implications.
Adverse weather conditions may decrease demand for our fertilizer products, increase the cost of natural gas or materially disrupt our operations.
Weather conditions that delay or disrupt field work during the planting, growing, harvesting or application periods may cause agricultural customers to use different forms of nitrogen fertilizer, which may adversely affect demand for the forms that we sell or may impede farmers from applying our fertilizers until the following application period, resulting in lower seasonal demand for our products.
Adverse weather conditions during or following harvest may delay or eliminate opportunities to apply fertilizer in the fall. Weather can also have an adverse effect on crop yields, which could lower the income of growers and impair their ability to purchase fertilizer from our customers. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in planting schedules and purchasing patterns.
Weather conditions or, in certain cases, weather forecasts, also can affect the price of natural gas, the principal raw material used to make our nitrogen fertilizer products. Colder than normal winters and warmer than normal summers increase the demand for natural gas for power generation and for residential and industrial use, which can increase the cost and/or decrease the availability of natural gas. In addition, adverse weather events such as very low temperatures leading to well freeze-offs or hurricanes affecting the Gulf of Mexico coastal states can impact the supply of natural gas and cause prices to rise.with us.
Tax matters, including changes in tax laws or rates, adverse determinations by taxing authorities and imposition of new taxes could adversely affect our results of operations and financial condition.
We are subject to taxes in (i) the United States, where most of our operations are located, and (ii) numerous foreign jurisdictions where our subsidiaries are organized.organized or conduct business. Tax rates in the various jurisdictions in which we operate may be subject to significant change. Our future effective tax rate could also be affected by changes in our mix of earnings from countries with differing statutory tax rates and tax systems, changes in valuation of deferred tax assets and liabilities or changes in tax laws or their interpretation.
We are also subject to regular reviews, examinations and audits by the IRSInternal Revenue Service (IRS) and other taxing authorities with respect to taxes inside and outside of the United States.in jurisdictions where we conduct business. Although we believe our tax estimates are reasonable, if a taxing authority disagrees with the positions we have taken, we could face additional tax liability,liabilities, including interest and penalties. There can be no assurance that payment of such additional amounts upon final adjudication of any disputes will not have a material impact on our results of operations and financial condition.
We have used the cash we generate outside the United States primarily to fund development of our business in non-U.S. jurisdictions. If the funds generated by our U.S. business are not sufficient to meet our need for cash in the United States, we may need to repatriate a portion of our future international earnings to the United States. Under the tax laws of the foreign countries in which we operate, those international earnings wouldcould be subject to withholding taxes when repatriated; therefore, the repatriation of those earnings could result in an increase in our worldwide effective tax rate and an increase in our use of cash to pay these taxes.
We also need to comply with other new, evolving or revised tax laws and regulations. The enactment of, or increases in, tariffs or value added taxes, or other changes in the application of existing taxes, in markets in which we are currently active, or may be active in the future, or on specific products that we sell or with which our products compete, could have an adverse effect on our results of operations and financial condition.

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On December 22, 2017, the president of theThe United States signed into law the Tax Cut and Jobs Act of 2017 (the "Tax Act" or "Tax Reform"). The Tax Act significantly changes how the U.S. taxes corporations. The Tax Act requires complex computations to be performed that were not previously required in U.S. tax law, significant judgments to be made in interpretation of the provisions of the Tax Act and significant estimates in calculations, and the preparation and analysis of information not previously relevant or regularly produced. The U.S. Treasury Department, the IRS, and other standard-setting bodiescountries in which we operate are in the process of implementing the Organization for Economic Co-operation and Development’s (OECD) Base Erosion and Profit Shifting Project (BEPS). BEPS is intended to improve tax disclosure and transparency and eliminate structures and activities that could interpret or issue guidance on how provisionsbe perceived by a particular country as resulting in tax avoidance. The OECD is currently developing a framework in order to assist member countries in adopting BEPS related legislation. Each country is permitted to introduce its own legislation to implement BEPS legislation. As a number of the Tax Act will be applied or otherwise administered that is different from the interpretation currently reflectedour business operations do business across country lines, we are subject to BEPS. The implementation of BEPS could result in our financial statements or tax returns. As we continue our analysis of the Tax Act, wechanges and may make adjustments to provisional amounts that we have recorded that may materially impactadversely affect our provision for income taxes, in the period in which such adjustments are made.
In addition, foreign governments may enact tax laws in response to the Tax Act that could result in further changes to global taxation and materially affect our financial position and results of operations.
We are reliant on a limited number of key facilities.
Our nitrogen fertilizer operations are located at nine separate nitrogen complexes, the largest of which is the Donaldsonville complex, which represented approximately 40% of our ammonia production capacity as of December 31, 2017. The suspension of operations at any of these complexes could adversely affect our ability to produce our products and fulfill our commitments, and could have a material adverse effect on our business, financial condition, results of operations and cash flows. In addition, our Donaldsonville complex is located in an area of the United States that experiences a relatively high level of hurricane or high wind activity and several of our complexes are located in areas that experience severe weather. Such storms, depending on their severity and location, have the potential not only to damage our facilities and disrupt our operations, but also to affect adversely the shipping and distribution of our products. Moreover, our facilities may be subject to failure of equipment that may be difficult to replace andsome cases, BEPS legislation could result in operational disruptions.double taxation in a portion of our profits without an appropriate mechanism to recover the incremental tax amount in another jurisdiction.
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Our business is subject to risks involving derivatives and the risk that our hedging activities might not prevent losses.
We may utilize natural gas derivatives to hedge our financial exposure to the price volatility of natural gas, the principal raw material used in the production of nitrogen-based products. We have used natural gas futures, swaps and option contracts traded in over-the-counter markets or on exchanges. We have also used fixed-price, physical purchase and sales contracts to hedge our exposure to natural gas price volatility. In order to manage our exposure to changes in foreign currency exchange rates, we may from time to time use foreign currency derivatives (primarily forward exchange contracts).
Our use of derivatives can result in volatility in reported earnings due to the unrealized mark-to-market adjustments that occur from changes in the value of the derivatives that do not qualify for, or to which we do not apply, hedge accounting. To the extent that our derivative positions lose value, we may be required to post collateral with our counterparties, adversely affecting our liquidity.
Hedging arrangements are imperfect and unhedged risks will always exist. In addition, our hedging activities may themselves give rise to various risks that could adversely affect us. For example, we are exposed to counterparty credit risk when our derivatives are in a net asset position. The counterparties to our derivatives are multi-national commercial banks, major financial institutions or large energy companies.
Our liquidity could be negatively impacted by a counterparty default on settlement of one or more of our derivative financial instruments or by the triggering of any cross default provisions or credit support requirements against us. Additionally, the International Swaps and Derivative Association master netting arrangements for most of our derivative instruments contain credit-risk-related contingent features, such as cross default provisions and credit support requirements. In the event of certain defaults or a credit ratings downgrade, our counterparty may request early termination and net settlement of certain derivative trades or may require us to collateralize derivatives in a net liability position.
At other times we may not utilize derivatives or derivative strategies to hedge certain risks or to reduce the financial exposure of price volatility. As a result, we may not prevent certain material adverse impacts that could have been mitigated through the use of derivative strategies.
Environmental and Regulatory Risks
We are subject to numerous environmental, health and safety laws, regulations and permitting requirements, as well as potential environmental liabilities, which may require us to make substantial expenditures.
We are subject to numerous environmental, health and safety laws and regulations in the United States, Canada, the United Kingdom, andthe European Union, the Republic of Trinidad and Tobago and other locations, including laws and regulations relating to the generation and handling of hazardous substances and wastes; the cleanup of hazardous substance releases; the discharge of regulated substances to air or water; and the demolition of existing plant sites upon permanent closure. In the United States, these laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act, the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), the Toxic Substances Control Act and various other federal, state, provincial, local and international statutes.laws.
As a producer of nitrogen fertilizer products working with hazardous substances, our business faces risks of spills, discharges or other releases of those substances into the environment. Certain environmental laws, including CERCLA, impose joint and several liability, without regard to fault, for cleanup costs on persons who have disposed of or released hazardous substances into the environment. Given the nature of our business, we have incurred, are incurring currently, and are likely to incur periodically in the future, liabilities under CERCLA and other environmental cleanup laws at our current facilities or facilities previously owned by us or other acquired businesses, adjacent or nearby third-party facilities or offsite disposal locations. The costs associated with future cleanup activities that we may be required to conduct or finance may be material. Additionally, we may become liable to third parties for damages, including personal injury and property damage, resulting from the disposal or release of hazardous substances into the environment.
Violations of environmental, health and safety laws can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. Environmental, health and safety laws change regularly and have tended to become more stringent over time. As a result, we have not always been and may not always be in compliance with all environmental, health and safety laws and regulations. We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial expenditures. Our costs to comply with, or any liabilities under, these laws and regulations could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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From time to time, our production, distribution or storage of anhydrous ammonia has resulted in accidental releases that have temporarily disrupted our manufacturing operations andand/or resulted in liability for administrative penalties andand/or claims for personal injury. To date, our costs to resolve these liabilities have not been material. However, we could incur significant costs if our liability coverage is not sufficient to pay for all or a large part of any judgments against us, or if our insurance carrier refuses coverage for these losses.

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We hold numerous environmental and other governmental permits and approvals authorizing operations at each of our facilities. Expansion or modification of our operations is predicated upon securing necessary environmental or other permits or approvals. A decision by a government agency to deny or delay issuing a new or renewed regulatory material permit or approval, or to revoke or substantially modify an existing permit or approval, or a determination that we have violated a law or permit as a result of a governmental inspection of our facilities could have a material adverse effect on our ability to continue operations at our facilities and on our business, financial condition, results of operations and cash flows. On October 26, 2015, the EPA published a final regulation lowering the national ambient air quality standard for ozone. Ozone attainment designations were due by October 1, 2017. In November 2017, the EPA issued a partial list of air quality regions that are in attainment with the 2015 ozone standard, but it has not yet promulgated the final list of air quality regions that will be classified as as being in nonattainment with the ozone standard. These regions will be subject to more stringent permitting requirements, which in turn could make it much more difficult and expensive to obtain permits to construct new facilities or expand our existing operations.
Future regulatory or legislative restrictions on greenhouse gas (GHG) emissions in the jurisdictions in which we operate could materially adversely affect our business, financial condition, results of operations and cash flows.
We are subject to GHG regulations in the United Kingdom, Canada and the United States. In the United States, our existing facilities currently are only subject to GHG emissions reporting obligations, although our new and modified facilities are likely tothat we build, or existing facilities that we modify in the future, could be subject to GHG emissions standards included in their air permits. Our facilities in the United Kingdom arehave been subject to regulatory emissions trading systems,the European Union Emissions Trading System (EU ETS), which generally requirerequired us to hold or obtain emissions allowances to offset GHG emissions from those aspects of our operations that are subject to regulation under this program. Our facilityNotwithstanding the exit of the United Kingdom from the European Union (Brexit) on January 31, 2020, facilities in Alberta, Canada has beenthe United Kingdom remained subject to a provincial regulation requiring reductions in the facility’s net emissions intensity, which can be met by facility improvements,EU ETS through the purchaseend of emissions offsets or performance credits, or contributions to a non-profit climate change fund established by Alberta.2020. Beginning in 2018,on January 1, 2021, our facilityU.K. manufacturing plants became subject to the Carbon Competitiveness Incentive Regulation. This regulationUK Emissions Trading Scheme (UK ETS). At least initially, the UK ETS is expected to be similar to the EU ETS, although the UK government has stated that it intends to establish an emissions cap that is lower than what it would have been had the United Kingdom remained subject to the EU ETS. No agreement has been reached as to whether the UK ETS will establish a linkage with the EU ETS or other national emission trading systems. Our Medicine Hat Nitrogen Complex, in Alberta, Canada, and our Courtright Nitrogen Complex, in Ontario, Canada, are subject to provincial or federal laws that impose a price on excess GHG emissions. Each of these laws establishes product-specific benchmarks based on the most efficient GHG emittingcarbon dioxide equivalent (CO2e) emissions standards applicable to our facilities in a sector. Similar toterms of emissions per unit of production, with the existing regulation, a facility that exceedsprovincial laws and the federal law using different formulas for establishing these intensity limits and changes in these limits over time. If CO2e emissions exceed the applicable benchmark is required to take action to reduce its GHGlimits, the excess emissions intensity, purchase emissionsmust be offset, either through obtaining qualifying emission credits or offsets or performance credits, or make contributionsby making a payment for each ton of excess emissions. The Canadian federal government has announced that it intends to Alberta's climate fund. The obligations under this regulation are being phased in over a three-year period and will be tightened over time.
Our Courtright, Ontario facility is subject to Ontario’s GHG cap-and-trade program that began in January 2017. In addition,increase the Canadian national government, in collaboration with Canadian provinces, has developed the Pan-Canadian Framework on Clean Growth and Climate Change. Among other things, the framework establishes a nationwide price on carbonof excess emissions which price serves as a floor for the GHG emissions reduction requirements of the separate Canadian provinces and territories. The announced plan would impose a $10CO2e from CAD $40 per ton (Canadian dollars) charge beginning in 2018, rising to2021 and CAD $50 per ton in 2022, by 2022. The framework provides for reviewCAD $15 per ton each year beginning in 2023, with the price of the approach takenexcess CO2e emissions reaching CAD $170 per ton by the national government and the provinces to address future action after 2022.2030.
There are substantial uncertainties as to the nature, stringency and timing of any future GHG regulations. On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement which has beenwas accepted by the United States and ratified by Canada and the United Kingdom and went into effect in November 2016. However,The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in June 2017,global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5ºC above pre-industrial levels. Each signatory is required to develop its own national plan to attain this objective. Increasing concern over the impacts of climate change is driving the signatories to establish ever more ambitious GHG reduction targets. In December 2020, the United Kingdom announced a target to reduce GHG emission 68% from 1990 levels by 2030. The EU has announced a new target to reduce its GHG emission 55% below 1990 levels by 2030. On November 4, 2019, the United States announcedsubmitted formal notice of its intention to withdrawwithdrawal from the Paris Agreement, subject to renegotiation of the Paris Agreementwhich became effective on terms more favorable to the United States. Under the terms of the Paris Agreement,November 4, 2020, but on January 20, 2021, President Biden announced that the United States cannot formally provide notice of its withdrawal before November 2019, which would become effective one year after providing such notice. Inhas rejoined the interim, it is unclear ifParis Agreement. This will require the United States will comply withto submit its commitments underown national plan for reducing GHG emissions. Executive Orders issued by the Paris Agreement. There has been no indicationBiden administration, including in particular an executive order issued on January 27, 2021 focusing on climate change, evidence the Administration’s intent to date that the United States' announced withdrawal is causing other countries to also consider withdrawing from the Paris Agreement. If the Paris Agreement remainsundertake numerous initiatives in effect, it could result in more aggressive effortsan effort to reduce GHG emissions, including promoting renewable energy development, limiting or prohibiting new oil and gas leases on federal lands, and in the jurisdictions in which we operate.general, making climate change considerations a critical component of federal policy.
More stringent GHG regulations, if they are enacted, are likely to have a significant impact on us, because our production facilities emit GHGs such as carbon dioxide and nitrous oxide and because natural gas, a fossil fuel, is a primary raw material used in our nitrogen production process. Regulation of GHGs may require us to make changes in our operating activities that would increase our operating costs, reduce our efficiency, limit our output, require us to make capital improvements to our facilities, increase our costs for or limit the availability of energy, raw materials or transportation, or otherwise materially adversely affect our business, financial condition, results of operations and cash flows. In addition, to the extent that GHG
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restrictions are not imposed in countries where our competitors operate or are less stringent than regulations that may be imposed in the United States, Canada or the United Kingdom, our competitors may have cost or other competitive advantages over us.

Strategic Risks
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TableThe market for green and low-carbon ammonia may be slow to develop, may not develop to the size expected or may not develop at all. Moreover, we may not be successful in the development and implementation of Contentsour green and low-carbon ammonia projects in a timely or economic manner, or at all, due to a number of factors, many of which are beyond our control.
CF INDUSTRIES HOLDINGS, INC.The market for green and low-carbon ammonia is developing and evolving, may not develop to the size or at the rate we expect, and is dependent in part on the developing market for green and low-carbon hydrogen. These markets are heavily influenced by federal, state and local government laws, regulations and policies concerning carbon emissions and clean energy in the United States and abroad.

We believe the demand for green and low-carbon ammonia will take several years to fully develop and mature and we cannot be certain that this market or the market for green and low-carbon hydrogen will grow to the size or at the rate we expect. Hydrogen currently only accounts for less than 1% of the world’s energy needs.

The recognition and acceptance of green and low-carbon ammonia as a transport and storage mechanism for green and low-carbon hydrogen, the use of green and low-carbon ammonia as a fuel in its own right and the development and growth of end market demand and applications for green and low-carbon hydrogen and green and low-carbon ammonia are uncertain and dependent on a number of factors outside of our control. These factors include, among others, the extent to which and rate at which cost competitive global renewable energy capacity increases, the pricing of alternative sources of energy, the realization of technological improvements required to increase the efficiency and lower the costs of production of green and low-carbon ammonia, the regulatory environment, the rate and extent of infrastructure investment and developments, the availability of tax benefits and other incentives and our ability to provide green and low-carbon ammonia offerings cost-effectively. If a sustainable market fails to develop or develops more slowly than we anticipate, we may decide not to implement, or may not be successful in implementing, one or more elements of our multi-year strategic plan and commitment to a clean fuel economy.


Our clean energy strategy also depends on the realization of certain technical improvements required to increase the efficiency and lower the costs of production of green and low-carbon ammonia. Over time, as we seek to convert additional existing production facilities and further expand our green ammonia and low-carbon ammonia production capacity, we may face operational difficulties and execution risks related to the design, development and construction. If our assumptions about the engineering and process characteristics necessary to successfully build the facility capacity that we are contemplating and to scale up to larger production quantities prove to be incorrect, we may be unable to produce substantial quantities of green or low-carbon ammonia, and the cost to construct or convert such green and low-carbon ammonia facilities, or the production costs associated with the operation of such facilities, may be higher than we project.
We may not be successful in the expansion of our business.
We routinely consider possible expansions of our business, both within the United States and elsewhere. Major investments in our business, including as a result of acquisitions, partnerships, joint ventures, business combination transactions or other major investments, such as our green and low-carbon ammonia projects, require significant managerial resources, the diversion of which from our other activities or opportunities may impair the operationexisting operations of our business. We may be unable to identify or successfully compete for certain acquisition targets, which may hinder or prevent us from acquiring a target or completing other transactions. The risks of any expansion of our business through investments, acquisitions, partnerships, joint ventures or business combination transactions are increased due to the significant capital and other resources that we may have to commit to any such expansion, which may not be recoverable if the expansion initiative to which they were devoted is ultimately not implemented. In addition, these efforts may require capital resources that could otherwise be used for the improvement and expansion of our existing business. As a result of these and other factors, including general economic risk, we may not be able to realize our projected returns from any future acquisitions, partnerships, joint ventures, business combination transactions or other major investments. Among the risks associated with the pursuit and consummation of acquisitions, partnerships, joint ventures or other major investments or business combination transactionscombinations are those involving:
difficulties in integrating the parties’ operations, systems, technologies, products and personnel;
incurrence of significant transaction-related expenses;
potential integration or restructuring costs;
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potential impairment charges related to the goodwill, intangible assets or other assets to which any such transaction relates, in the event that the economic benefits of such transaction prove to be less than anticipated;
other unanticipated costs associated with such transactions;
our ability to achieve operating and financial efficiencies, synergies and cost savings;
our ability to obtain the desired financial or strategic benefits from any such transaction;
the parties’ ability to retain key business relationships, including relationships with employees, customers, partners and suppliers;
potential loss of key personnel;
entry into markets or involvement with products with which we have limited current or prior experience or in which competitors may have stronger positions;
assumption of contingent liabilities, including litigation;
exposure to unanticipated liabilities;
differences in the parties’ internal control environments, which may require significant time and resources to resolve in conformity with applicable legal and accounting standards;
increased scope, geographic diversity and complexity of our operations;
the tax effects of any such transaction; and
the potential for costly and time-consuming litigation, including stockholder lawsuits.
In addition, major capital projects may be dependent on the availability and performance of engineering firms, construction firms, equipment suppliers, transportation providers and other vendors necessary to design and implement those projects on a timely basis and on acceptable terms. Major investments such as capital improvements at our facilities are subject to a number of risks, any of which could prevent us from completing capital projects in a timely or economic manner or at all, including, without limitation, cost overruns, non-performance of third parties, the inability to obtain necessary permits or other permitting matters, adverse weather, defects in materials and workmanship, labor and raw material shortages, transportation constraints, engineering and construction change orders, errors in design, construction or start-up, and other unforeseen difficulties.
International acquisitions, partnerships, joint ventures, investments or business combinations or investments and other international expansions of our business involve additional risks and uncertainties, including, but not limited to:
the impact of particular economic, tax, currency, political, legal and regulatory risks associated with specific countries;
challenges caused by distance and by language and cultural differences;
difficulties and costs of complying with a wide variety of complex laws, treaties and regulations;
unexpected changes in regulatory environments;
political and economic instability, including the possibility for civil unrest;
nationalization of properties by foreign governments;
tax rates that may exceed those in the United States, and earnings that may be subject to withholding requirements;
the imposition of tariffs, exchange controls or other restrictions; and
the impact of currency exchange rate fluctuations.
If we finance acquisitions, partnerships, joint ventures, business combination transactions or other major investments by issuing equity or convertible or other debt securities or loans, our existing stockholders may be diluted or we could face constraints under the terms of, and as a result of the repayment and debt-service obligations under, the additional indebtedness. A business combination transaction between us and another company could result in our stockholders receiving cash or shares of another entity on terms that such stockholders may not consider desirable. Moreover, the regulatory approvals associated with a business combination may result in divestitures or other changes to our business, the effects of which are difficult to predict.

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Our operating results fluctuate due to seasonality. Our inability to predict future seasonal fertilizer demand accurately could result in our having excess inventory, potentially at costs in excess of market value, or product shortages.
The fertilizer business is seasonal. The degree of seasonality of our business can change significantly from year to year due to conditions in the agricultural industry and other factors. The strongest demand for our products in North America occurs during the spring planting season, with a second period of strong demand following the fall harvest. We and our customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application season and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in our sales volumes and net sales being the highest during the spring and our working capital requirements being the highest just prior to the start of the spring planting season.
If seasonal demand is less than we expect, we may be left with excess inventory that will have to be stored (in which case our results of operations will be negatively affected by any related increased storage costs) or liquidated (in which case the selling price may be below our production, procurement and storage costs). The risks associated with excess inventory and product shortages are exacerbated by the volatility of natural gas and nitrogen fertilizer prices and the relatively brief periods during which farmers can apply nitrogen fertilizers. If prices for our products rapidly decrease, we may be subject to inventory write-downs, adversely affecting our operating results. If seasonal demand is greater than we expect, we may experience product shortages, and customers of ours may turn to our competitors for products that they would otherwise have purchased from us.
A change in the volume of products that our customers purchase on a forward basis, or the percentage of our sales volume that is sold to our customers on a forward basis, could increase our exposure to fluctuations in our profit margins and materially adversely affect our business, financial condition, results of operations and cash flows.
We offer our customers the opportunity to purchase products from us on a forward basis at prices and delivery dates we propose. Under our forward sales programs, customers generally make an initial cash down payment at the time of order and pay the remaining portion of the contract sales value in advance of the shipment date. Forward sales improve our liquidity due to the cash payments received from customers in advance of shipment of the product and allow us to improve our production scheduling and planning and the utilization of our manufacturing and distribution assets.
Any cash payments received in advance from customers in connection with forward sales are reflected on our consolidated balance sheets as a current liability until the related orders are shipped, which can take up to several months.
We believe the ability to purchase products on a forward basis is most appealing to our customers during periods of generally increasing prices for nitrogen fertilizers. Our customers may be less willing or even unwilling to purchase products on a forward basis during periods of generally decreasing or stable prices or during periods of relatively high fertilizer prices due to the expectation of lower prices in the future or limited capital resources. In periods of rising fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in lower profit margins than if we had not sold fertilizer on a forward basis. Conversely, in periods of declining fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in higher profit margins than if we had not sold fertilizer on a forward basis. In addition, fixing the selling prices of our products, often months in advance of their ultimate delivery to customers, typically causes our reported selling prices and margins to differ from spot market prices and margins available at the time of shipment.
Our business is subject to risks involving derivatives and the risk that our hedging activities might not prevent losses.
We often utilize natural gas derivatives to hedge our financial exposure to the price volatility of natural gas, the principal raw material used in the production of nitrogen-based products. We have used futures, financial swaps and option contracts traded in the over-the-counter markets or on exchanges. In order to manage our exposure to changes in foreign currency exchange rates, from time to time, we may use foreign currency derivatives, primarily forward exchange contracts.
Our use of derivatives can result in volatility in reported earnings due to the unrealized mark-to-market adjustments that occur from changes in the value of the derivatives that do not qualify for, or to which we do not apply, hedge accounting. To the extent that our derivative positions lose value, we may be required to post collateral with our counterparties, adversely affecting our liquidity.
We have also used fixed-price, physical purchase and sales contracts to hedge our exposure to natural gas price volatility. Hedging arrangements are imperfect and unhedged risks will always exist. In addition, our hedging activities may themselves give rise to various risks that could adversely affect us. For example, we are exposed to counterparty credit risk when our derivatives are in a net asset position. The counterparties to our derivatives are multi-national commercial banks, major financial institutions or large energy companies.

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Our liquidity could be negatively impacted by a counterparty default on settlement of one or more of our derivative financial instruments or by the trigger of any cross default provisions or credit support requirements. Additionally, the International Swaps and Derivative Association master netting arrangements for most of our derivative instruments contain credit-risk-related contingent features, such as cross default provisions and credit support requirements. In the event of certain defaults or a credit ratings downgrade, our counterparty may request early termination and net settlement of certain derivative trades or may require us to collateralize derivatives in a net liability position.
We are subject to risk associated with our strategic venture with CHS Inc. (CHS).
We may not realize the full benefits from our strategic venture with CHS that are expected. The realization of the expected benefits of the CHS strategic venture depends on our ability to operate and manage the strategic venture successfully, and on the market prices of the nitrogen fertilizer products that are the subject of our supply agreement with CHS over the life of the agreement, among other factors. Additionally, any challenges related to the CHS strategic venture could harm our relationships with CHS or our other customers.
We are exposed to risks associated with our joint venture.
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COVID-19 Pandemic Risk
Our business and operations may be adversely affected by the COVID-19 pandemic.
The outbreak and pandemic of the coronavirus disease 2019 (COVID-19) could have a 50% ownership interestmaterial and adverse effect on our business, financial condition, results of operations or cash flows. The rapid spread of COVID-19 has resulted in PLNL,governmental authorities implementing numerous measures to try to contain the virus, such as travel bans and restrictions, quarantines, shelter in place orders and shutdowns. Even though our business operations are designated as part of the critical infrastructure by the United States, United Kingdom and Canadian governments and the governments of the states and provinces in which ownswe operate, these measures have impacted and operates an ammonia productionmay further impact all or portions of our workforce and operations. If significant portions of our workforce are unable to work effectively, including because of illness, quarantines, government actions, facility closures or other restrictions, we may be unable to meet customer demand or perform fully under our contracts.
In addition, our customers, suppliers and third party service providers, including transportation providers, have been, or may be in the Republicfuture, affected by COVID-19, including by the impact of Trinidadmeasures taken by federal and Tobago. Our joint venture partner shares a measurelocal governments to slow the spread of control over the virus. Any negative impacts on our customers, suppliers and third party service providers could negatively impact our business, financial condition, results of operations or cash flows. For example, global demand for nitrogen for industrial use has been negatively affected by the pandemic, and we expect this to continue as long as economic activity remains low due to the impacts of the pandemic. Restrictions on or disruptions of transportation, port closures or increased border controls or closures, or other impacts on domestic and global supply chains or distribution channels, could increase our PLNL joint venture. As a result, our investment in our PLNL joint venture involves risks that are different from the risks involved in owning facilities and operations independently. These risks include the possibility that our PLNL joint venture or our partner: have economic or business interests or goals that are or become inconsistent with our economic or business interests or goals; are in a position to take action contrary to (or have veto rights over) our instructions, requests, policies or objectives; subject our PLNL joint venture to liabilities exceeding those contemplated; take actions that reduce our return on investment; or take actions that harm our reputation or restrictcosts, limit our ability to run our business.
In addition, we may become involved in disputes with our PLNL joint venture partner, which could lead to impassesmeet customer demand or situations that could harm the joint venture, which could reduce our revenues or increase our costs.
PLNL's ammonia plant relies on natural gas supplied, under a Gas Sales Contract (the NGC Contract), by the National Gas Company of Trinidad and Tobago Limited (NGC). The joint venture has experienced curtailments in the supply of natural gas from NGC, which have reduced the ammonia production at PLNL. The NGC Contract had an initial expiration date of September 2018 and has been extended on the same terms until September 2023. Any NGC commitment to supply gas beyond 2023 will need to be based on new agreements regarding volume and price. PLNL and NGC are currently parties to arbitration proceedings where the main issue remaining in dispute is PLNL's claims for damages from curtailments. Although the joint venture believes its claims against NGC to be meritorious, it is not possible to predict the outcome of the arbitration. There are significant assumptions in the future operations of the joint venture, beyond 2023, that are uncertain at this time, including the quantities of gas NGC will make available, the cost of such gas, the estimates that are used to determine the useful lives of fixed assets and the assumptions in the discounted cash flow models utilized for recoverability and impairment testing.
As part of our impairment assessment of our equity method investment in PLNL, we determined the carrying value exceeded the fair value and recognized a $134 million impairment charge in 2016. Previously, in 2015, we recognized an impairment charge of $62 million related to our equity method investment in PLNL. The carrying value of our equity method investment in PLNL at December 31, 2017 is $108 million. Failure to secure a long-term gas supply from NGC after 2023 on a cost effective basis could adversely affect our ability to produce ammonia at the joint venture and could result in further impairment to the value of the joint venture, such as ceasing operations and writing off the remaining investment in PLNL, which couldotherwise have a material adverse effect on our business, financial condition, results of operations.operations or cash flows.
ActsThe COVID-19 pandemic has reduced and may further reduce the demand for energy, including crude oil, as well as natural gas and coal, which are nitrogen feedstocks. Reduced demand for nitrogen feedstocks has reduced and could further reduce the cost of terrorismnitrogen production outside of North America, increasing global nitrogen supply and regulations to combat terrorism could negatively affect our business.
Like other companies with major industrial facilities, we may be targets of terrorist activities. Manyreducing the market prices of our plantsproducts. Lower demand for crude oil could also reduce the supply and facilities store significant quantitiestherefore increase the cost of ammonianatural gas, which is the principal raw material used in our production of nitrogen fertilizers. In addition, lower crude oil prices, and other materials that can be dangerous if mishandled. Any damagea reduced demand for gasoline resulting from actions to infrastructure facilities, such as electric generation, transmissionslow the spread of COVID-19, have reduced ethanol production and distribution facilities, or injury to employees, who could be direct targets or indirect casualties of an act of terrorism, may affect our operations. Any disruption of our ability to produce or distribute our products could result intherefore negatively impacted the demand for corn, which is a significant decrease in revenuesfactor driving customer demand for our nitrogen fertilizers. The pandemic has also disrupted traditional food supply chains, which may have a material impact on livestock and significant additional costs to replace, repair or insure our assets, whichfood demand, including the demand for corn. Each of these consequences could have a material adverse effect on our business, financial condition, results of operations andor cash flows.
Due to concerns related to terrorism orWhile the potential use of certain fertilizers as explosives, we are subject to various security laws and regulations. In the United States, these security laws include the Maritime Transportation Security Act of 2002 and the Chemical Facilities Anti-Terrorism Standards regulation. In addition, President Obama issued in 2013 Executive

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Order 13650 Improving Chemical Facility Safety and Security to improve chemical facility safety in coordination with owners and operators. Governmental entities could implement new or impose more stringent regulations affecting the security of our plants, terminals and warehouses or the transportation and use of fertilizers. These regulations could result in higher operating costs or limitations on the sale of our products and could result in significant unanticipated costs, lower revenues and reduced profit margins. We manufacture and sell certain nitrogen products that can be used as explosives. It is possible that governmental entities in the United States or elsewhere could impose additional limitations on the use, sale or distribution of nitrogen products, thereby limiting our ability to manufacture or sell those products, or that illicit use of our products could result in liability for us.
In October 2016, the Department of Homeland Security (DHS) released its new Chemical Security Assessment Tool (CSAT 2.0) surveys and enhanced risk tiering methodology. Facilities that had previously submitted a survey response to the DHS were notified to resubmit responses to online questionnaires to be evaluated through the revised and enhanced risk tiering methodology. In April 2017, the DHS began sending tiering determination letters to chemical facilities based on the new methodology. Depending on the risk classification resulting from the application of CSAT 2.0, our plants and terminals could be subject to more stringent stringent requirements related to chemical security.
We are subject to risks associated with international operations.
Our international business operations are subject to numerous risks and uncertainties, including difficulties and costs associated with complying with a wide variety of complex laws, treaties and regulations; unexpected changes in regulatory environments; currency fluctuations; tax rates that may exceed those in the United States; earnings that may be subject to withholding requirements; and the imposition of tariffs, exchange controls or other restrictions.
Our principal reporting currency is the U.S. dollar and our business operations and investments outside the United States increase our risk related to fluctuations in foreign currency exchange rates. The main currencies to which we are exposed, besides the U.S. dollar, are the Canadian dollar, the British pound and the euro. These exposures may change over time as business practices evolve and economic conditions change, including, for example, in response to sudden global economic conditions resulting from measures like the referendum in the United Kingdom in June 2016, which resulted in a vote in favor of exiting the European Union (Brexit). We may selectively reduce some foreign currency exchange rate risk by, among other things, requiring contracted purchases of our products to be settled in, or indexed to, the U.S. dollar or a currency freely convertible into U.S. dollars, or hedging through foreign currency derivatives. These efforts, however, mayCOVID-19 pandemic did not be effective and could have a material adverse effect on our reported results for the year ended December 31, 2020, we are unable to predict the ultimate impact it may have on our business, financial condition, results of operations andor cash flows.
We The extent to which our operations may be impacted by COVID-19 will depend on future developments, which are subject to anti-corruption lawshighly uncertain and regulations and economic sanctions programs in various jurisdictions,cannot be accurately predicted, including the U.S. Foreign Corrupt Practices Actfurther spread of 1977, the United Kingdom Bribery Actvirus, the duration of 2010, the Canadian Corruption of Foreign Public Officials Act, and economic sanctions programs administered by the United Nations, the European UnionCOVID-19 outbreak and the Officetype and duration of Foreign Assets Control ofactions that may be taken by various governmental authorities in response to the U.S. Department of the Treasury, and regulations set forth under the Comprehensive Iran Accountability Divestment Act. As a result of doing business internationally, we are exposed to a risk of violating anti-corruption laws and sanctions regulations applicable in those countries where we, our partners or agents operate. Violations of anti-corruption and sanctions laws and regulations are punishable by civil penalties, including fines, denial of export privileges, injunctions, asset seizures, debarment from government contracts (and termination of existing contracts) and revocations or restrictions of licenses, as well as criminal fines and imprisonment.outbreak. The violation of applicable laws by our employees, consultants, agents or partners could subject us to penalties and could have a material adverse effect on our business, financial condition, results of operations and cash flows.
We are subject to antitrust and competition laws in various countries throughout the world. We cannot predict how these laws or their interpretation, administration and enforcement will change over time. Changes in antitrust laws globally, or in their interpretation, administration or enforcement, may limit our existing or future operations and growth.
Deterioration ofpandemic significantly increased global market uncertainty and caused an economic conditions could haveslowdown, which resulted in a material adverse effect on our business, financial condition, results of operations and cash flows.
A slowdown of, or persistentglobal recession. Persistent weakness in economic activity caused by a deterioration of global market and economic conditions could materially adversely affect our business, in the following ways, among others: conditions in the credit markets could affect the abilityfinancial condition, results of our customers and their customers to obtain sufficient credit to support their operations; the failure of our customers to fulfill their purchase obligations could result in increases in bad debts and impact our working capital; and the failure of certain key suppliers could increase our exposure to disruptions in supplyoperations or to financial losses. We also may experience declining demand and falling prices for some of our products due to our customers’ reluctance to replenish inventories. Changes in global economic conditions can arise suddenly and the full impact of such changes can be difficult to ascertain, resulting in anxiety among market participants that can persist for protracted periods. For example, concern and

cash flows.
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uncertainty over the potential impact of Brexit on the global economy has resulted in increased volatility in global financial markets. The overall impact of changes in global economic conditions on us is difficult to predict, and our business could be materially adversely impacted.
In addition, conditions in the international market for nitrogen products significantly influence our operating results. The international market for nitrogen products is influenced by such factors as currency exchange rates, including the relative value of the U.S. dollar and its impact upon the cost of importing of nitrogen products into the United States, foreign agricultural policies, the existence of, or changes in, import or foreign currency exchange barriers in certain foreign markets and the laws and policies of the markets in which we operate that affect foreign trade and investment.

FORWARD LOOKING STATEMENTS
From time to time, in this Annual Report on Form 10-K as well as in other written reports and oral statements, we make forward-looking statements that are not statements of historical fact and may involve a number of risks and uncertainties. These statements relate to analyses and other information that are based on forecasts of future results and estimates of amounts not yet determinable. These statements may also relate to our prospects, future developments and business strategies. We have used the words "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "plan," "predict," "project," "will"“anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “predict,” “project,” “will” or "would"“would” and similar terms and phrases, including references to assumptions, to identify forward-looking statements in this document. These forward-looking statements are made based on currently available competitive, financial and economic data, our current expectations, estimates, forecasts and projections about the industries and markets in which we operate and management'smanagement’s beliefs and assumptions concerning future events affecting us. These statements are not guarantees of future performance and are subject to risks, uncertainties and factors relating to our operations and business environment, all of which are difficult to predict and many of which are beyond our control. Therefore, our actual results may differ materially from what is expressed in or implied by any forward-looking statements. We want to caution you not to place undue reliance on any forward-looking statements. We do not undertake any responsibility to release publicly any revisions to these forward-looking statements to take into account events or circumstances that occur after the date of this document. Additionally, we do not undertake any responsibility to provide updates regarding the occurrence of any unanticipated events which may cause actual results to differ from those expressed or implied by the forward-looking statements contained in this document.
Important factors that could cause actual results to differ materially from our expectations are disclosed under "Risk Factors"“Risk Factors” and elsewhere in this Annual Report on Form 10-K. Such factors include, among others:
the cyclical nature of our business and the agricultural sector;
the global commodity nature of our fertilizer products, the impact of global supply and demand on our selling prices,prices;
the global commodity nature of our nitrogen products, the conditions in the international market for nitrogen products, and the intense global competition from other fertilizer producers;
conditions in the U.S.United States, Europe and Europeanother agricultural industry;areas;
the volatility of natural gas prices in North America and Europe;
weather conditions;
the seasonality of the fertilizer business;
the impact of changing market conditions on our forward sales programs;
difficulties in securing the supply and delivery of raw materials, increases in their costs or delays or interruptions in their delivery;
reliance on third party providers of transportation services and equipment;
risks associated with cyber security;
our reliance on a limited number of key facilities;
acts of terrorism and regulations to combat terrorism;
risks associated with international operations;
the significant risks and hazards involved in producing and handling our products against which we may not be fully insured;
our ability to manage our indebtedness;indebtedness and any additional indebtedness that may be incurred;
operating and financial restrictions imposed on us by the agreements governing our senior secured indebtedness;
risks associated with our incurrence of additional indebtedness;
our ability to maintain compliance with covenants under our revolving credit agreement and the agreements governing our indebtedness;
downgrades of our credit ratings;
risks associated with cyber security;
weather conditions;
risks associated with changes in tax laws and disagreements with taxing authorities;
risks involving derivatives and the effectiveness of our reliance on a limited number of key facilities;risk measurement and hedging activities;
potential liabilities and expenditures related to environmental, health and safety laws and regulations and permitting requirements;
future regulatory restrictions and requirements related to greenhouse gas emissions;
the development and growth of the market for green and low-carbon ammonia and the risks and uncertainties relating to the development and implementation of our green and low-carbon ammonia projects;
risks associated with expansions of our business, including unanticipated adverse consequences and the significant resources that could be required;
the seasonality of the fertilizer business;
the impact of changing market conditions on our forward sales programs;
risks involving derivatives and the effectiveness of our risk measurement and hedging activities;

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risks associated with the operation or management of the CHS strategic venture, risks and uncertainties relating to the market prices of the fertilizer products that are the subject of our supply agreement with CHS over the life of the supply agreement, and the risk that any challenges related to the CHS strategic venture will harm our other business relationships; and
risks associated withthe impact of the novel coronavirus disease 2019 (COVID-19) pandemic, including measures taken by governmental authorities to slow the spread of the virus, on our PLNL joint venture;business and operations.
acts
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deterioration of global market and economic conditions.

ITEM 1B.    UNRESOLVED STAFF COMMENTS.
None.
ITEM 2.    PROPERTIES.
Information regarding our facilities and properties is included in Item 1. Business—Reportable Segments and Item 1. Business—Storage Facilities and Other Properties.
Certain of our distribution and storage facilities in the United States are subject to mortgages securing obligations under the Revolving Credit Agreement and our senior secured notes. For additional information, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt.
ITEM 3.    LEGAL PROCEEDINGS.
Litigation
West Fertilizer Co.
On April 17, 2013, there was a fire and explosion at the West Fertilizer Co. fertilizer storage and distribution facility in West, Texas. According to published reports, 15 people were killed and approximately 200 people were injured in the incident, and the fire and explosion damaged or destroyed a number of homes and buildings around the facility. Various subsidiaries of CF Industries Holdings, Inc. (the CF Entities) have beenwere named as defendants along with other companies in lawsuits filed in 2013, 2014 and 2015 in the District Court of McLennan County, Texas by the City of West, individual residents of the County and other parties seeking recovery for damages allegedly sustained as a result of the explosion. The cases have beenwere consolidated for discovery and pretrial proceedings in the District Court of McLennan County under the caption "In“In re: West Explosion Cases." The two-year statute of limitations expired on April 17, 2015. As of that date, over 400 plaintiffs had filed claims, including at least 9 entities, 325 individuals, and 80 insurance companies. Plaintiffs allege various theories of negligence, strict liability, and breach of warranty under Texas law. Although we do not own or operate the facility or directly sell our products to West Fertilizer Co., products that the CF Entities have manufactured and sold to others have beenwere delivered to the facility and may have been stored at the West facility at the time of the incident.
The Court granted in part and denied in part the CF Entities'Entities’ Motions for Summary Judgment in August 2015. Over onethree hundred sixty cases have been resolved pursuant to confidential settlements that have been or we expect will be fully funded by insurance. The remaining cases are in various stages of discovery and pre-trial proceedings. The next trialgroup of cases is expected to be scheduledset for later in 2018.trial after the Court resumes scheduling civil jury trials currently on hold because of the coronavirus disease 2019 (COVID-19) pandemic. We believe we have strong legal and factual defenses and intend to continue defending the CF Entities vigorously in the pending lawsuits. The Company cannot provide a range of reasonably possible loss due to the lack of damages discovery for many of the remaining claims and the uncertain nature of this litigation, including uncertainties around the potential allocation of responsibility by a jury to other defendants or responsible third parties. The recognition of a potential loss in the future in the West Fertilizer Co. litigation could negatively affect our results in the period of recognition. However, based upon currently available information, including available insurance coverage, we do not believe that this litigation will have a material adverse effect on our consolidated financial position, results of operations or cash flows.
Yazoo City Clean Air Act
On February 10, 2016, CFN was orally informed by representatives of the Mississippi Department of Environmental Quality (MDEQ) of MDEQ’s intent to impose a civil penalty of an amount exceeding $100,000 for alleged violations of certain fuel firing rate limits in the Company’s Clean Air Act Title V Permit for the Yazoo City, Mississippi facility. Representatives of the Company attended an administrative conference with MDEQ in early July 2016 to discuss MDEQ’s findings and calculation of the proposed penalty. On July 20, 2017, the Company and MDEQ executed an Agreed Order with MDEQ that that requires the Company to pay $95,625 that fully and finally resolves the alleged permit limit exceedances at issue in this matter.

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Environmental
Florida Environmental Matters
On March 17, 2014, we completed the sale of our phosphate mining and manufacturing business, which was located in Florida, to Mosaic. Pursuant to the terms of the definitive agreement executed in October 2013 among CF Industries Holdings, Inc., CF Industries and Mosaic, Mosaic assumed the following environmental matters and we agreed to indemnify Mosaic with respect to losses arising out of the matters below, subject to a maximum indemnification cap and the other terms of the definitive agreement.
Clean Air Act Notice of Violation
We received a Notice of Violation (NOV) from the EPA by letter dated June 16, 2010, alleging that we violated the Prevention of Significant Deterioration Clean Air Act regulations relating to certain projects undertaken at the former Plant City, Florida facility's sulfuric acid plants. This NOV further alleges that the actions that are the basis for the alleged PSD violations also resulted in violations of Title V air operating permit regulations. Finally, the NOV alleges that we failed to comply with certain compliance dates established by hazardous air pollutant regulations for phosphoric acid manufacturing plants and phosphate fertilizer production plants. We had several meetings with the EPA with respect to this matter prior to our sale of the phosphate mining and manufacturing business in March 2014. We and Mosaic have separately had continued discussions with the EPA subsequent to our sale of the phosphate mining and manufacturing business with respect to this matter. We do not know at this time if this matter will be settled prior to initiation of formal legal action.
We cannot estimate the potential penalties, fines or other expenditures, if any, that may result from the Clean Air Act NOV and, therefore, we cannot determine if the ultimate outcome of this matter will have a material impact on our consolidated financial position, results of operations or cash flows.
EPCRA/CERCLA Notice of Violation
By letter dated July 6, 2010, the EPA issued a NOV to us alleging violations of Section 313 of the Emergency Planning and Community Right-to-Know Act (EPCRA) in connection with the former Plant City facility. EPCRA requires annual reports to be submitted with respect to the use of certain toxic chemicals. The NOV also included an allegation that we violated Section 304 of EPCRA and Section 103 of CERCLA by failing to file a timely notification relating to the release of hydrogen fluoride above applicable reportable quantities. We do not know at this time if this matter will be settled prior to initiation of formal legal action.
We do not expect that penalties or fines, if any, that may arise out of the EPCRA/CERCLA matter will have a material impact on our consolidated financial position, results of operations or cash flows.
Other
CERCLA/Remediation Matters
For information on pending proceedings relating to environmental remediation matters, see Item 1. Business—Environmental, Health and SafetySafety—CERCLA/Remediation Matters and Note 19—20—Contingencies to our consolidated financial statements included in Item 8 of this report.
ITEM 4.    MINE SAFETY DISCLOSURESDISCLOSURES.
Not applicable.

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PART II
ITEM 5.    MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES.
Our common stock is traded on the New York Stock Exchange, Inc. (NYSE) under the symbol "CF". Quarterly high and low sales prices, as reported by the NYSE, are provided below:Company
 Sales Prices Dividends
per Share
2017High Low 
First Quarter$37.17
 $28.35
 $0.30
Second Quarter30.07
 25.04
 0.30
Third Quarter36.51
 27.27
 0.30
Fourth Quarter43.42
 33.50
 0.30

 Sales Prices Dividends
per Share
2016High Low 
First Quarter$40.95
 $26.10
 $0.30
Second Quarter35.84
 23.15
 0.30
Third Quarter28.32
 20.77
 0.30
Fourth Quarter32.61
 22.00
 0.30
As of February 15, 2018, there were 753 stockholders of record.
The following table sets forth stock repurchases for each of the three months of the quarter ended December 31, 2017.
        
 Issuer Purchases of Equity Securities
Period
Total
Number
of Shares
(or Units)
Purchased
(1)
 Average
Price Paid
per Share
(or Unit)
 Cumulative Number of
Shares (or Units)
Purchased as Part of
Publicly Announced
Plans or Programs
 Maximum Number (or
Approximate Dollar
Value) of Shares (or
Units) that May Yet Be
Purchased Under the
Plans or Programs
(in thousands)
October 1, 2017 - October 31, 2017
 $
  

 $
November 1, 2017 - November 30, 2017
 
 
 
December 1, 2017 - December 31, 2017324
 39.26
 
 
Total324
 $39.26
  
  

(1)
Represents shares withheld to pay for employee tax obligations upon the vesting of restricted stock units.


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ITEM 6.    SELECTED FINANCIAL DATA.
The following selected historical financial data as of December 31, 2017 and 2016 and for the years ended December 31, 2017, 2016 and 2015 have been derived from our audited consolidated financial statements and related notes included elsewhere in this document. The following selected historical financial data as of December 31, 2015, 2014 and 2013 and for the years ended December 31, 2014 and 2013 have been derived from our consolidated financial statements, which are not included in this document. The selected historical financial data should be read in conjunction with the information contained in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations and Item 8. Financial Statements and Supplementary Data.
 Year ended December 31,
 2017 2016 
2015(1)
 
2014(2)
 2013
 (in millions, except per share amounts)
Statement of Operations Data: 
  
  
  
  
Net sales$4,130
 $3,685
 $4,308
 $4,743
 $5,475
Cost of sales3,700
 2,845
 2,761
 2,965
 2,955
Gross margin430
 840
 1,547
 1,778
 2,520
Selling, general and administrative expenses192
 174
 170
 152
 166
Transaction costs
 179
 57
 
 
Other operating—net18
 208
 92
 53
 (16)
Total other operating costs and expenses210
 561
 319
 205
 150
Gain on sale of phosphate business
 
 
 750
 
Equity in earnings (losses) of operating affiliates9
 (145) (35) 43
 42
Operating earnings229
 134
 1,193
 2,366
 2,412
Interest expense—net303
 195
 131
 177
 147
Loss on debt extinguishment53
 167
 
 
 
Other non-operating—net(2) (2) 4
 2
 55
(Loss) earnings before income taxes and equity in earnings of non-operating affiliates(125) (226) 1,058
 2,187
 2,210
Income tax (benefit) provision(575) (68) 396
 773
 687
Equity in earnings of non-operating affiliates—net of taxes
 
 72
 23
 10
Net earnings (loss)450
 (158) 734
 1,437
 1,533
Less: Net earnings attributable to noncontrolling interests92
 119
 34
 47
 68
Net earnings (loss) attributable to common stockholders$358
 $(277) $700
 $1,390
 $1,465
Cash dividends declared per common share$1.20
 $1.20
 $1.20
 $1.00
 $0.44
Share and per share data: 
  
  
  
  
Net earnings (loss) per share attributable to common stockholders: 
  
  
  
  
Basic$1.53
 $(1.19) $2.97
 $5.43
 $4.97
Diluted1.53
 (1.19) 2.96
 5.42
 4.95
Weighted-average common shares outstanding: 
  
  
  
  
Basic233.5
 233.1
 235.3
 255.9
 294.4
Diluted233.9
 233.1
 236.1
 256.7
 296.0
Other Financial Data: 
  
  
  
  
Depreciation, depletion and amortization$883
 $678
 $480
 $393
 $411
Capital expenditures473
 2,211
 2,469
 1,809
 824

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 December 31,
 2017 2016 
2015(1)
 
2014(2)
 2013
 (in millions)
Balance Sheet Data: 
  
  
  
  
Cash and cash equivalents$835
 $1,164
 $286
 $1,997
 $1,711
Total assets(3)
13,463
 15,131
 12,683
 11,200
 10,574
Customer advances89
 42
 162
 325
 121
Total debt(3)
4,692
 5,778
 5,537
 4,538
 3,054
Total equity6,684
 6,492
 4,387
 4,572
 5,438

(1)
On July 31, 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK not previously owned by us. CF Fertilisers UK is now wholly owned by us. The financial results of CF Fertilisers UK have been consolidated within our financial results since July 31, 2015. Prior to July 31, 2015, our initial 50% equity interest in CF Fertilisers UK was accounted for as an equity method investment and the financial results of this investment were included in equity in earnings of non-operating affiliates—net of taxes. See Note 7—Equity Method Investments for additional information.

(2)
On March 17, 2014, we completed the sale of our phosphate mining and manufacturing business. The selected historical financial data above includes the results of the phosphate business through March 17, 2014, plus the continuing sales of the phosphate inventory in the distribution network after March 17, 2014. The remaining phosphate inventory was sold in the second quarter of 2014. The results of the phosphate mining and manufacturing business are not reported as discontinued operations in our consolidated statements of operations.
(3)
Total debt and total assets have been retroactively restated for the years ended December 31, 2015, 2014 and 2013 to reflect our adoption during fiscal year 2016 of Accounting Standards Update 2015-03, Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs, which resulted in the reclassification of deferred debt issuance costs from other assets to an offset of long-term debt on our consolidated balance sheets. See Note 11—Financing Agreements for additional information.



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ITEM 7.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.
You should read the following discussion and analysis in conjunction with the consolidated financial statements and related notes included in Item 8. Financial Statements and Supplementary Data. All references to "CF“CF Holdings," "we," "us," "our"” “we,” “us,” “our” and "the Company"“the Company,” refer to CF Industries Holdings, Inc. and its subsidiaries, except where the context makes clear that the reference is only to CF Industries Holdings, Inc. itself and not its subsidiaries. All references to "CF Industries"“CF Industries” refer to CF Industries, Inc., a 100% owned subsidiary of CF Industries Holdings, Inc. References to tons refer to short-tons. Notes referenced inthroughout this discussion and analysisdocument refer to the notes to consolidated financial statementsstatement note disclosures that are found in Item 8. Financial Statements and Supplementary DataData—Notes to Consolidated Financial Statements.
We are a leading global manufacturer of hydrogen and nitrogen products for clean energy, fertilizer, emissions abatement, and other industrial applications. We operate nitrogen manufacturing complexes in the United States, Canada and the United Kingdom, which are among the most cost-advantaged, efficient and flexible in the world, and an extensive storage, transportation and distribution network in North America. Our 3,000 employees focus on safe and reliable operations, environmental stewardship and disciplined capital and corporate management, driving our strategy to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our principal customers are cooperatives, independent fertilizer distributors, traders, wholesalers and industrial users. Our core product is anhydrous ammonia (ammonia), which contains 82% nitrogen and 18% hydrogen. Our nitrogen products that are upgraded from ammonia are granular urea, urea ammonium nitrate solution (UAN) and ammonium nitrate (AN). Our other nitrogen products include diesel exhaust fluid (DEF), urea liquor, nitric acid and aqua ammonia, which are sold primarily to our industrial customers, and compound fertilizer products (NPKs), which are solid granular fertilizer products for which the nutrient content is a combination of nitrogen, phosphorus and potassium.
Our principal assets as of December 31, 2020 include:
five U.S. nitrogen manufacturing facilities, located in Donaldsonville, Louisiana (the largest nitrogen complex in the world); Port Neal, Iowa; Yazoo City, Mississippi; Verdigris, Oklahoma; and Woodward, Oklahoma. These facilities are wholly owned directly or indirectly by CF Industries Nitrogen, LLC (CFN), of which we own approximately 89% and CHS Inc. (CHS) owns the remainder;
two Canadian nitrogen manufacturing facilities, located in Medicine Hat, Alberta (the largest nitrogen complex in Canada) and Courtright, Ontario;
two United Kingdom nitrogen manufacturing facilities, located in Billingham and Ince;
an extensive system of terminals and associated transportation equipment located primarily in the Midwestern United States; and
a 50% interest in Point Lisas Nitrogen Limited (PLNL), an ammonia production joint venture located in the Republic of Trinidad and Tobago that we account for under the equity method.
We have a strategic venture with CHS under which CHS owns an equity interest in CFN, a subsidiary of CF Holdings, which represents approximately 11% of the membership interests of CFN. We own the remaining membership interests. CHS also receives deliveries pursuant to a supply agreement under which CHS has the right to purchase annually from CFN up to approximately 1.1 million tons of granular urea and 580,000 tons of UAN at market prices. As a result of its minority equity interest in CFN, CHS is entitled to semi-annual cash distributions from CFN. We are also entitled to semi-annual cash distributions from CFN. See Note 17—Noncontrolling Interests for additional information on our strategic venture with CHS.
For the years ended December 31, 2020, 2019 and 2018, we sold 20.3 million, 19.5 million and 19.3 million product tons generating net sales of $4.12 billion, $4.59 billion and $4.43 billion, respectively.
Our principal executive offices are located outside of Chicago, Illinois, at 4 Parkway North, Suite 400, Deerfield, Illinois 60015, and our telephone number is 847-405-2400. Our Internet website address is www.cfindustries.com. Information made available on our website does not constitute part of this Annual Report on Form 10-K.
We make available free of charge on or through our Internet website, www.cfindustries.com, all of our reports on Forms 10-K, 10-Q and 8-K and all amendments to those reports as soon as reasonably practicable after such material is filed electronically with, or furnished to, the Securities and Exchange Commission (SEC). Copies of our Corporate Governance Guidelines, Code of Corporate Conduct and charters for the Audit Committee, Compensation and Management Development Committee, Corporate Governance and Nominating Committee, and Environmental Sustainability and Community Committee of our Board of Directors (the Board) are also available on our Internet website. We will provide electronic or paper copies of
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these documents free of charge upon request. The SEC also maintains a website at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC.
Our Commitment to a Clean Energy Economy
In October 2020, we announced that we are taking significant steps to support a global hydrogen and clean fuel economy, through the production of green and low-carbon ammonia. Since ammonia is one of the most efficient ways to transport and store hydrogen and is also a fuel in its own right, we believe that the Company, as the world’s largest producer of ammonia, with an unparalleled manufacturing and distribution network and deep technical expertise, is uniquely positioned to fulfill anticipated demand for hydrogen and ammonia from green and low-carbon sources. Our strategy is to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our approach will focus on green ammonia production, which refers to ammonia produced through a carbon-free process, and low-carbon ammonia, which relates to ammonia produced by conventional processes but with CO2 removed through carbon capture and sequestration (CCS) and other certified carbon abatement projects. We have announced an initial green ammonia project at our flagship Donaldsonville nitrogen complex to produce approximately 20,000 tons per year of green ammonia. Additionally, we are developing CCS and other carbon abatement projects across our production facilities that will enable us to produce low-carbon ammonia.
Company History
We were founded in 1946 as Central Farmers Fertilizer Company, and were owned by a group of regional agriculture cooperatives for the first 59 years of our existence. Central Farmers became CF Industries in 1970.
Originally established as a fertilizer brokerage company, we expanded owning and operating fertilizer manufacturing and distribution facilities in the early 1950s with a principal objective of assured supply for our owners. At various times in our history, we manufactured and/or distributed nitrogen, phosphate and potash fertilizers.
We operated as a traditional manufacturing and supply cooperative until 2002, when we adopted a new business model that established financial performance as our principal objective, rather than assured supply to our owners. A critical aspect of the new business model was to establish a more economically driven approach to the marketplace.
In August 2005, we completed our initial public offering (IPO) of common stock, which is listed on the New York Stock Exchange. In connection with the IPO, we consummated a reorganization transaction whereby we ceased to be a cooperative and our pre-IPO owners’ equity interests in CF Industries were canceled in exchange for all of the proceeds of the offering and shares of our common stock. At the time of the IPO, our assets consisted of one wholly owned nitrogen manufacturing facility in Louisiana, United States; a joint venture nitrogen manufacturing facility in Alberta, Canada, of which we owned 66 percent; a phosphate mining and manufacturing operation in Florida, United States; and distribution facilities throughout North America.
In April 2010, we acquired Terra Industries Inc. (Terra), a leading North American producer and marketer of nitrogen fertilizer products for a purchase price of $4.6 billion, which was paid in cash and shares of our common stock. As a result of the Terra acquisition, we acquired five nitrogen fertilizer manufacturing facilities, an approximately 75.3% interest in TNCLP and certain joint venture interests.
In March 2014, we exited our phosphate mining and manufacturing business, which was located in Florida, through a sale to The Mosaic Company for approximately $1.4 billion in cash. As a result, our company became focused solely on nitrogen manufacturing and distribution.
In July 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK Group Limited (formerly known as GrowHow UK Group Limited) (CF Fertilisers UK) not previously owned by us for total consideration of $570 million, and CF Fertilisers UK became wholly owned by us. This transaction added CF Fertilisers UK’s nitrogen manufacturing complexes in Ince, United Kingdom and Billingham, United Kingdom to our consolidated manufacturing capacity.
In February 2016, our strategic venture with CHS commenced, at which time CHS made a capital contribution of $2.8 billion to CFN in exchange for membership interests in CFN, which represented approximately 11% of the total membership interests of CFN.
In late 2015 and 2016, we completed certain capacity expansion projects at Donaldsonville, Louisiana and Port Neal, Iowa. These projects, originally announced in 2012, included the construction of new ammonia, urea, and UAN plants at our Donaldsonville, Louisiana complex and new ammonia and urea plants at our Port Neal, Iowa complex. These plants increased our overall production capacity by approximately 25%, improved our product mix flexibility at Donaldsonville, and improved our ability to serve upper-Midwest urea customers from our Port Neal location. The total capital cost of the capacity expansion projects was $5.2 billion.
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Prior to April 2, 2018, Terra Nitrogen, Limited Partnership, which owns and operates our nitrogen manufacturing facility in Verdigris, Oklahoma, was a subsidiary of Terra Nitrogen Company, L.P. (TNCLP). TNCLP was a publicly traded limited partnership of which we were the sole general partner and the majority limited partner, and in which we owned an approximate 75.3% interest.
In 2018, we announced that, in accordance with the terms of TNCLP’s First Amended and Restated Agreement of Limited Partnership (as amended by Amendment No. 1 to the First Amended and Restated Agreement of Limited Partnership, the TNCLP Agreement of Limited Partnership), Terra Nitrogen GP Inc. (TNGP), the sole general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP (the TNCLP Public Units). On April, 2, 2018, TNGP completed its purchase of the TNCLP Public Units (the Purchase) for an aggregate cash purchase price of $388 million. We funded the Purchase with cash on hand. Upon completion of the Purchase, CF Holdings owned, through its subsidiaries, 100 percent of the general and limited partnership interests of TNCLP.
Product Tons and Nutrient Tons
Unless otherwise stated, we measure our production and sales volume in this Annual Report on Form 10-K in product tons, which represents the weight of the product measured in short tons (one short ton is equal to 2,000 pounds). References to UAN product tons assume a 32% nitrogen content basis for production volume. 
We also provide certain supplementary volume information measured in nutrient tons. Nutrient tons represent the weight of the product’s nitrogen content, which varies by product. Ammonia represents 82% nitrogen content, granular urea represents 46% nitrogen content, UAN represents between 28% and 32% nitrogen content and AN represents between 29% and 35% nitrogen content. 
Reportable Segments
Our reportable segments consist of the following segments: ammonia, granular urea, UAN, AN and Other. These segments are differentiated by products. We use gross margin to evaluate segment performance and allocate resources. Total other operating costs and expenses (consisting of selling, general and administrative expenses and other operating—net) and non-operating expenses (interest and income taxes), are centrally managed and are not included in the measurement of segment profitability reviewed by management. See Note 21—Segment Disclosures for additional information.
Our Products
Our primary nitrogen products are ammonia, granular urea, UAN and AN. Our historical sales of nitrogen products are shown in the following table. Net sales do not reflect amounts used internally, such as ammonia, in the manufacture of other products.
 202020192018
 Sales Volume (tons)Net SalesSales Volume (tons)Net SalesSales Volume (tons)Net Sales
 (tons in thousands; dollars in millions)
Products   
Ammonia3,767 $1,020 3,516 $1,113 3,135 $1,028 
Granular urea5,148 1,248 4,849 1,342 4,898 1,322 
UAN6,843 1,063 6,807 1,270 7,042 1,234 
AN2,216 455 2,109 506 2,002 460 
Other(1)
2,322 338 2,257 359 2,252 385 
Total20,296 $4,124 19,538 $4,590 19,329 $4,429 

(1)Other segment products include DEF, urea liquor, nitric acid, aqua ammonia and NPKs.
Gross margin was $801 million, $1,174 million and $917 million for the years ended December 31, 2020, 2019 and 2018, respectively.
We own and operate seven nitrogen manufacturing facilities in North America, including five nitrogen manufacturing facilities in the United States, and two in Canada. As of December 31, 2020, the combined production capacity of these seven facilities represented approximately 37%, 42%, 44% and 19% of North American ammonia, granular urea, UAN and AN production capacity, respectively. Each of our nitrogen manufacturing facilities in North America has on-site storage to provide
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flexibility to manage the flow of outbound shipments without impacting production. We also operate two United Kingdom nitrogen manufacturing facilities that produce ammonia, AN and NPKs and serve primarily the British agricultural and industrial markets.
The following table shows the production capacities as of December 31, 2020 at each of our nitrogen manufacturing facilities:
 
Average Annual Capacity(1)
 
Gross
Ammonia(2)
Net
Ammonia(2)
UAN(3)
Urea(4)
AN(5)
Other(6)
 (tons in thousands)
Donaldsonville, Louisiana(7)
4,335 1,390 3,255 2,635 — 445 
Medicine Hat, Alberta1,230 770 — 810 — — 
Port Neal, Iowa1,230 110 800 1,350 — 110 
Verdigris, Oklahoma(8)
1,210 430 1,955 — — — 
Woodward, Oklahoma480 130 810 — — 115 
Yazoo City, Mississippi(8)(9)
570 — 160 — 1,035 125 
Courtright, Ontario(8)(10)
500 265 345 — — 400 
Ince, U.K.(11)
380 15 — — 575 415 
Billingham, U.K.(8)
595 230 — — 625 410 
10,530 3,340 7,325 4,795 2,235 2,020 
Unconsolidated Affiliate      
Point Lisas, Trinidad(12)
360 360 — — — — 
Total10,890 3,700 7,325 4,795 2,235 2,020 

(1)Average annual capacity includes allowance for normal outages and planned maintenance shutdowns.
(2)Gross ammonia capacity includes ammonia used to produce upgraded products. Net ammonia capacity is gross ammonia capacity less ammonia used to produce upgraded products based on the product mix shown in the table.
(3)Measured in tons of UAN containing 32% nitrogen by weight.
(4)Reflects granular urea capacity from the Donaldsonville, Medicine Hat, and Port Neal facilities. Urea liquor and DEF production capacities are included in Other.
(5)AN includes prilled products (Amtrate and industrial-grade AN, or IGAN) and AN solution produced for sale.
(6)Includes product tons of: urea liquor and DEF from the Donaldsonville, Port Neal, Woodward, Yazoo City, and Courtright facilities; nitric acid from the Courtright, Yazoo City, Billingham, and Ince facilities; and NPKs from the Ince facility. Production of DEF can be increased by reducing urea and/or UAN production.
(7)The Donaldsonville facility capacities present an outlineestimated production mix. This facility is capable of producing between 2.4 million and 3.3 million tons of granular urea and between 1.2 million and 4.3 million tons of UAN annually. The facility is also capable of producing up to 1.2 million product tons of 32.5% DEF.
(8)Reduction of UAN or AN production at the Yazoo City, Courtright, Verdigris, and Billingham facilities can allow more merchant nitric acid to be made available for sale.
(9)The Yazoo City facility’s production capacity depends on product mix. With the facility maximizing the production of AN products, 160,000 tons of UAN can be produced. UAN production can be increased to 450,000 tons by reducing the production of AN to 900,000 tons.
(10)Production of urea liquor and DEF at the Courtright facility can be increased by reducing UAN production.
(11)The Ince facility can increase production of NPKs and nitric acid by reducing AN production.
(12)Represents our 50% interest in the capacity of PLNL.

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The following table summarizes our production volume for the last three years:
 December 31,
 202020192018
 (tons in thousands)
Ammonia(1)
10,353 10,246 9,805 
Granular urea5,001 4,941 4,837 
UAN (32%)6,677 6,768 6,903 
AN2,115 2,128 1,731 

(1)Gross ammonia production, including amounts subsequently upgraded on-site into granular urea, UAN or AN.
Donaldsonville, Louisiana
The Donaldsonville facility is the world’s largest and most flexible nitrogen complex. It has six ammonia plants, five urea plants, four nitric acid plants, three UAN plants, and one DEF plant. The complex, which is located on the Mississippi River, includes deep-water docking facilities, access to an ammonia pipeline, and truck and railroad loading capabilities. The complex has on-site storage for 140,000 tons of ammonia, 201,000 tons of UAN (measured on a 32% nitrogen content basis) and 130,000 tons of granular urea.
Medicine Hat, Alberta, Canada
The Medicine Hat facility, located in southeast Alberta, is the largest nitrogen complex in Canada. It has two ammonia plants and one urea plant. The complex has on-site storage for 60,000 tons of ammonia and 60,000 tons of granular urea.
Port Neal, Iowa
The Port Neal facility is located approximately 12 miles south of Sioux City, Iowa, on the Missouri River. The facility consists of two ammonia plants, three urea plants, two nitric acid plants and one UAN plant. The location has on-site storage for 85,000 tons of ammonia, 130,000 tons of granular urea, and 100,000 tons of 32% UAN.
Verdigris, Oklahoma
The Verdigris facility is located northeast of Tulsa, Oklahoma, near the Verdigris River. It is the second largest UAN production facility in North America. The facility comprises two ammonia plants, two nitric acid plants, two UAN plants and a port terminal. We lease the port terminal from the Tulsa-Rogers County Port Authority. The complex has on-site storage for 60,000 tons of ammonia and 100,000 tons of 32% UAN.
Woodward, Oklahoma
The Woodward facility is located in rural northwest Oklahoma and consists of one ammonia plant, two nitric acid plants, two urea plants and two UAN plants. The facility has on-site storage for 36,000 tons of ammonia and 84,000 tons of 32% UAN.
Yazoo City, Mississippi
The Yazoo City facility is located in central Mississippi and includes one ammonia plant, four nitric acid plants, one AN plant, two urea plants, one UAN plant and a dinitrogen tetroxide production and storage facility. The site has on-site storage for 50,000 tons of ammonia, 48,000 tons of 32% UAN and 11,000 tons of AN and related products.
Courtright, Ontario, Canada
The Courtright facility is located south of Sarnia, Ontario near the St. Clair River. The facility consists of an ammonia plant, a UAN plant, a nitric acid plant and a urea plant. The location has on-site storage for 64,000 tons of ammonia and 16,000 tons of 32% UAN.
Ince, United Kingdom
The Ince facility is located in northwestern England and consists of one ammonia plant, three nitric acid plants, one AN plant and three NPK plants. The location has on-site storage for 11,000 tons of ammonia, 95,000 tons of AN, and 40,000 tons of NPKs.
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Billingham, United Kingdom
The Billingham facility, located in the Teesside chemical area in northeastern England, is geographically split among three primary locations: the main site, which contains an ammonia plant, three nitric acid plants and a carbon dioxide plant; the Portrack site, approximately two miles away, which contains an AN fertilizer plant; and the North Tees site, approximately seven miles away, which contains an ammonia storage area. These locations collectively have on-site storage for 40,000 tons of ammonia and 128,000 tons of AN.
Point Lisas, Trinidad
The Point Lisas Nitrogen facility in the Republic of Trinidad and Tobago is owned jointly through a 50/50 venture with Koch Fertilizer LLC. This facility has the capacity to produce 720,000 tons of ammonia annually from natural gas supplied under a contract with The National Gas Company of Trinidad and Tobago Limited (NGC).
Nitrogen Fertilizer Raw Materials
Natural gas is the principal raw material and primary fuel source used in the ammonia production process at our nitrogen manufacturing facilities. In 2020, natural gas accounted for approximately one-third of our total production costs for nitrogen products. Our nitrogen manufacturing facilities have access to abundant, competitively-priced natural gas through a reliable network of pipelines that are connected to major natural gas trading hubs near the facilities. Our facilities utilize the following natural gas hubs: Henry Hub in Louisiana; SONAT in Louisiana; TETCO ELA in Louisiana; ONEOK in Oklahoma; AECO in Alberta; Ventura in Iowa; Demarcation in Kansas; Welcome in Minnesota; Dawn in Ontario; Parkway in Ontario; and the National Balancing Point (NBP) in the United Kingdom.
In 2020, our nitrogen manufacturing facilities consumed, in the aggregate, approximately 365 million MMBtus of natural gas. We employ a combination of daily spot and term purchases from a variety of quality suppliers to maintain a reliable, competitively-priced supply of natural gas. We also use certain financial instruments to hedge natural gas prices. See Note 15—Derivative Financial Instruments for additional information about our natural gas hedging activities.
Nitrogen Fertilizer Distribution
The safe, efficient and economical distribution of nitrogen products is critical for successful operations. Our nitrogen production facilities have access to multiple transportation modes by which we ship products to terminals, warehouses and customers. Each of our production facilities has a unique distribution pattern based on its production capacity and location.
Our North American nitrogen production facilities can ship products via truck and rail to customers and to our storage facilities in the U.S. and Canada, with access to our leased railcar fleet of approximately 5,000 tank and hopper cars, as well as railcars provided by rail carriers. Our United Kingdom nitrogen production facilities mainly ship products via truck.
The North American waterway system is also used extensively to ship products from our Donaldsonville, Verdigris and Yazoo City facilities. To ship ammonia and UAN, we employ a fleet of ten tow boats and twenty-eight river barges, which are primarily leased. We also utilize contract marine services to move urea fertilizer. We can also export nitrogen fertilizer products via seagoing vessels from our Donaldsonville, Yazoo City, Billingham and Ince manufacturing facilities.
The Donaldsonville facility is connected to the 2,000-mile long Nustar pipeline through which we have the ability to transport ammonia to ten terminals and shipping points in the Midwestern U.S. corn belt.
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Storage Facilities and Other Properties
As of December 31, 2020, we owned or leased space at 63 in-market storage terminals and warehouses located in a 21-state region of the discussionUnited States, Canada and analysisthe United Kingdom. Including storage at our production facilities, we have an aggregate storage capacity for approximately 3.2 million tons of product. Our storage capabilities are summarized in the following table:
 AmmoniaGranular Urea
UAN(1)
AN
 Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Plants546 320 549 234 
Terminal and Warehouse Locations
Owned22 780 — — 244 — — 
Leased(2)
124 32 24 391 — — 
Total In-Market28 904 32 33 635 — — 
Total Storage Capacity1,450 352 1,184 234 

(1)Capacity is expressed as the equivalent volume of UAN measured on a 32% nitrogen content basis.
(2)Our lease agreements are typically for periods of one to five years.
Customers
The principal customers for our nitrogen products are cooperatives, independent fertilizer distributors, traders, wholesalers and industrial users. Sales are generated by our internal marketing and sales force. CHS was our largest customer in 2020 and accounted for approximately 13% of our consolidated net sales. We have a strategic venture with CHS under which CHS has a minority equity interest in CFN. See Note 17—Noncontrolling Interests for additional information on our strategic venture with CHS.
Competition
Our markets are global and intensely competitive, based primarily on delivered price and, to a lesser extent, on customer service and product quality. During the peak demand periods, product availability and delivery time also play a role in the buying decisions of customers.
Our primary North American-based competitors include Nutrien Ltd., Koch Fertilizer LLC and Iowa Fertilizer Company. There is also significant competition from products sourced from other regions of the world, including some with lower natural gas or other feedstock costs. Because ammonia, urea and UAN are widely-traded fertilizer products and there are limited barriers to entry, we experience competition from foreign-sourced products continuously.
Our primary United Kingdom competition comes from imported products supplied by companies including Yara International, Origin Fertilisers, Ameropa, CHS and Helm. Urea and UAN are not produced in the United Kingdom, but along with AN are widely-traded fertilizer products with limited barriers to entry.
Seasonality
The fertilizer business is seasonal. The degree of seasonality of our business can change significantly from year to year due to weather conditions in the agricultural industry and other factors. The strongest demand for our products in North America occurs during the spring planting season, with a second period of strong demand following the fall harvest. In contrast, we and other fertilizer producers generally manufacture and distribute products throughout the year. As a result, we and/or our customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application season and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in our sales volumes and net sales being the highest during the spring and our working capital requirements being the highest just prior to the start of the spring planting season. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in planting schedules and purchasing patterns.
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Environmental, Health and Safety
We are subject to numerous environmental, health and safety laws and regulations in the United States, Canada, the United Kingdom, the European Union and the Republic of Trinidad and Tobago, including laws and regulations relating to the generation and handling of hazardous substances and wastes; the cleanup of hazardous substance releases; the discharge of regulated substances to air or water; and the demolition of existing plant sites upon permanent closure. In the United States, these laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act (RCRA), the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), the Toxic Substances Control Act (TSCA), the Occupational Safety and Health Act (OSHA) and various other federal, state and local statutes. Violations of environmental, health and safety laws can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. In addition, environmental, health and safety laws and regulations may impose joint and several liability, without regard to fault, for cleanup costs on potentially responsible parties who have released or disposed of hazardous substances into the environment. We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future.
Environmental, Health and Safety Expenditures
Our environmental, health and safety capital expenditures in 2020 totaled approximately $40 million. We estimate that we will have approximately $45 million of capital expenditures for environmental, health and safety in 2021. In addition, to support safe and reliable operations at our continuous process manufacturing facilities, we conduct scheduled inspections, replacements and overhauls of our plant machinery and equipment, which are referred to as turnarounds. A further description of turnaround activities is included herein:in Note 6—Property, Plant and Equipment—Net to our consolidated financial statements included in Item 8 of this report. Environmental, health and safety laws and regulations are complex, change frequently and have tended to become more stringent over time. We expect that continued government and public emphasis on environmental issues will result in increased future expenditures for environmental controls at our manufacturing and distribution facilities. Such expenditures could have a material adverse effect on our business, financial condition, results of operations and cash flows. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial expenditures. Our costs to comply with, or any liabilities under, these laws and regulations could have a material adverse effect on our business, financial condition, results of operations and cash flows.
CERCLA/Remediation Matters
From time to time, we receive notices from governmental agencies or third parties alleging that we are a potentially responsible party at certain cleanup sites under CERCLA or other environmental cleanup laws. In 2011, we received a notice from the Idaho Department of Environmental Quality (IDEQ) that alleged that we were a potentially responsible party for the cleanup of a former phosphate mine site we owned in the late 1950s and early 1960s located in Georgetown Canyon, Idaho. The current owner of the property and a former mining contractor received similar notices for the site. Based on a Consent Order entered into with IDEQ and the U.S. Forest Service in 2014, we and the current property owner are currently conducting a remedial investigation and feasibility study of the site. In 2015, we and several other parties received a notice that the U.S. Department of the Interior and other trustees intend to undertake a natural resource damage assessment for 17 former phosphate mines in southeast Idaho, one of which is the former Georgetown Canyon mine. See Note 20—Contingencies for additional information.
Regulation of Greenhouse Gases
We are subject to regulations in the United Kingdom, the European Union, Canada and the United States concerning greenhouse gas (GHG) emissions.
The United Kingdom has adopted GHG emissions regulations, including regulations to implement the European Union Greenhouse Gas Emission Trading System (EU ETS). Our U.K. manufacturing plants are required to report GHG emissions annually to the United Kingdom Environment Agency pursuant to their site Environmental Permits and Climate Change Agreement, which specify energy efficiency targets. Failure to meet efficiency targets may require these plants to purchase CO2 emissions allowances. The steam boilers at each of our U.K. sites have also been subject to the EU ETS, and have been required to hold or obtain emissions allowances to offset GHG emissions. Notwithstanding the exit of the United Kingdom from the European Union (Brexit) on January 31, 2020, facilities in the United Kingdom remained subject to the EU ETS through the end of 2020. Beginning on January 1, 2021, our U.K. manufacturing plants became subject to the UK Emissions Trading Scheme (UK ETS). At least initially, the UK ETS is expected to be similar to the EU ETS, although the U.K. government has stated that it intends to establish an emissions cap that is lower than what it would have been had the United Kingdom remained subject to the EU ETS. No agreement has been reached as to whether the UK ETS will establish a linkage with the EU ETS or other national emission trading systems.
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In Canada, we are required to conduct an annual review of our operations with respect to compliance with Environment Canada’s National Pollutant Release Inventory and Ontario’s Mandatory Monitoring and Reporting Regulation and the GHG Reporting Regulation. In 2018, the federal Greenhouse Pollution Pricing Act came into effect, pursuant to which Environment and Climate Change Canada (ECCC) will implement the Output-Based Performance Standard (OBPS), which is intended to function as a backstop to provincial greenhouse gas emissions regulations. In June 2019, the ECCC finalized the emission limits for carbon dioxide equivalent (CO2e) emissions from nitrogen fertilizer products. These emission limits are based on 95% of the average emissions intensity for the production of such products from all Canadian nitrogen fertilizer plants, reflecting that such products are deemed to be energy-intensive and trade-exposed and thus subject to a less stringent emissions reduction requirement. In the provinces and territories where the OBPS applies, a facility whose carbon emissions exceed the applicable limits is required to offset emissions by obtaining and retiring surplus emission credits, obtaining qualifying emissions offsets, or paying a fee, which for calendar year 2019 was CAD $20 per ton of excess carbon dioxide equivalent, and which fee increases by CAD $10 per ton for each succeeding year through 2022. In December 2020, the Canadian federal government announced that it intended to increase the price of excess emissions of CO2e by CAD $15 per ton for each year beginning in 2023, with the price of excess CO2e emissions reaching CAD $170 per ton by 2030. Ontario, Saskatchewan and Alberta are challenging whether the federal government has jurisdiction to impose a federal carbon price on the provinces and territories. The Saskatchewan Court of Appeal (in May 2019) and the Ontario Court of Appeal (in June 2019) each held that the Greenhouse Pollution Pricing Act (GPPA) was validly enacted under the Canadian constitution, while the Alberta Court of Appeal ruled in February 2020 that the GPPA was unconstitutional. Oral argument on the appeal of these decisions was heard by the Supreme Court of Canada in September 2020.
In January 2017, Ontario launched its own GHG cap and trade program and beginning January 1, 2018, Ontario’s cap and trade program was linked with the cap and trade programs in Quebec and California. Our Courtright Nitrogen Complex was subject to the Ontario cap and trade program. However, the Ontario government rescinded the cap and trade program in June 2018. Because Ontario no longer had a GHG regulatory regime, the federal government imposed the OBPS in the province beginning in 2019. In July 2019, the new Ontario government enacted a new GHG regulation, called the Emissions-Performance Standards program (EPS), that sets CO2e emissions limits for nitrogen products based on a production weighted sectoral average. For facilities whose carbon emissions exceed the applicable limits, compliance options included the purchase of emissions performance units for a fee of CAD $20 per ton of excess CO2e for calendar year 2019, which fee rises by CAD $10 per ton each year through 2022. Except for registration and recordkeeping provisions, the EPS has not yet gone into effect in Ontario and facilities in Ontario are subject to the federal OBPS. However, in September 2020, ECCC announced that the Ontario EPS met the federal government’s minimum stringency benchmark requirements, and the federal carbon pricing system will no longer apply in Ontario at a date to be set in consultation between ECCC and the Ontario government.
Beginning in 2018, our Medicine Hat Nitrogen Complex became subject to the Carbon Competitiveness Incentive Regulation (CCIR). This regulation establishes product-specific benchmarks based on the most efficient GHG-emitting facilities in a sector. A facility with emissions that exceeded the applicable benchmark was required to take action to reduce its GHG emissions intensity, purchase emissions offsets or performance credits, or make contributions to Alberta’s climate fund. In 2019, the Alberta government passed the Technology Innovation and Emission Reduction Implementation Act (TIER), which replaced the CCIR and went into effect on January 1, 2020. The TIER requires large emitting facilities (other than electricity producers, which are subject to a different standard) to comply with the least stringent of a “facility-specific” benchmark of 90% of historical GHG emissions intensity from a three-year baseline, which intensity limit will be reduced by 1% a year beginning in 2021, or a benchmark reflecting the emissions intensity of the top 10% of facilities for a given sector. The compliance options under the TIER are similar to the compliance options under the CCIR, including initially establishing the price for payments into its carbon fund at CAD $30 per excess ton of emissions (the same effective price as set in the CCIR). The federal government had determined that Alberta’s CCIR meets its stringency requirements and did not impose the OBPS in 2019. In December 2019, the federal government determined that the TIER also met the stringency requirements of the OBPS with respect to its regulation of large industrial emitters for 2020. The Alberta government has announced that it will increase the levy for excess emissions of CO2e from CAD $30 per ton in 2020 by CAD $10 per year, up to CAD $50 per ton in 2022, to match the price of carbon established in the OBPS.
In the United States, GHG regulation is evolving at state, regional and federal levels, although some of the more significant developments to date, including EPA’s efforts to regulate greenhouse gas emissions from fossil fuel-fired power plants, do not directly impose obligations on our facilities. The EPA issued a mandatory GHG reporting rule that required all of our U.S. manufacturing facilities to commence monitoring GHG emissions beginning on January 1, 2010 and reporting the previous year’s emissions annually starting in 2011. In addition, if we seek to modify or expand any of our major facilities and as a result, are required to obtain a Prevention of Significant Deterioration (PSD) construction permit applicable to such facilities, we could be subject to pollution control requirements applicable to GHGs in addition to requirements applicable to conventional air pollutants. Such requirements may result in increased costs or delays in completing such projects. Other than
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the states’ implementation of this permitting requirement, none of the states where our U.S. production facilities are located-Iowa, Louisiana, Mississippi and Oklahoma-has proposed control regulations limiting GHG emissions.
On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement was accepted by the United States and ratified by Canada and the United Kingdom and went into effect in November 2016. The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5°C above pre-industrial levels. Each signatory is required to develop its own national plan to attain this objective. Increasing concern over the impacts of climate change is driving the signatories to establish even more ambitious GHG reduction targets. In December 2020, the United Kingdom announced a target to reduce GHG emission 68% from 1990 levels by 2030. The EU has announced a new target to reduce its GHG emission 55% below 1990 levels by 2030. On November 4, 2019, the United States submitted formal notice of its withdrawal from the Paris Agreement, which became effective on November 4, 2020, but on January 20, 2021, President Biden announced that the United States has rejoined the Paris Agreement. This will require the United States to submit its own national plan for reducing GHG emissions. Executive Orders issued by the Biden Administration, including in particular an executive order issued on January 27, 2021 focusing on climate change, evidence the Administration’s intent to undertake numerous initiatives in an effort to reduce GHG emissions, including promoting renewable energy development, limiting or prohibiting new oil and gas leases on federal lands, and in general, making climate change considerations a critical component of federal policy.
New Source Performance Standards for Nitric Acid Plants
We operate 14 nitric acid plants in the United States. On August 14, 2012, the EPA issued a final regulation revising air emission standards applicable to newly constructed, reconstructed or modified nitric acid plants. The regulations will apply to these plants if and when we undertake activities or operations that are considered modifications, including physical changes that would allow us to increase our production capacity at these plants. The regulations include certain provisions that could make it difficult for us to meet the limits on emissions of nitrogen oxides (NOx) notwithstanding pollution controls we may add to our plants, and accordingly, the regulations could impact our ability to expand production at our existing plants. The EPA regulation did not include a limitation on emissions of nitrous oxide (a greenhouse gas).
Regulatory Permits and Approvals
We hold numerous environmental and other governmental permits and approvals authorizing operations at each of our facilities. A decision by a government agency to deny or delay issuing a new or renewed regulatory material permit or approval, or to revoke or substantially modify an existing material permit or approval, could have a material adverse effect on our ability to continue operations at the affected facility. Any future expansion of our existing operations is also predicated upon securing the necessary environmental or other permits or approvals. More stringent environmental standards may impact our ability to obtain such permits.
Human Capital Resources
Our long-term success depends on our people. We are dedicated to creating a workplace where employees are proud to work and grow and everyone feels empowered to do their best work. We do this by investing in extensive recruitment, training and professional development opportunities for our employees and fostering diversity and inclusion in our culture.
Employee Population. We employed approximately 3,000 employees at December 31, 2020, of which 66% were located in the United States, 20% in the United Kingdom, and 14% in Canada. As of December 31, 2020, 16% of our employees have worked for the Company more than 20 years, 16% of our employees have worked for the Company between 11 and 20 years, 27% of our employees have worked for the Company between 6 and 10 years, and 41% of our employees have worked at the Company for less than 6 years. Full-time employees represented approximately 99% of our workforce as of December 31, 2020 and approximately 15% were covered by a collective bargaining agreement. We supplement our workforce with contractors with specialized skill sets during periods of peak activity, such as during turnarounds and maintenance events.
Culture, Inclusion and Diversity. Our core values and their underlying principles reflect our commitment to a diverse and inclusive culture, treating one another with respect. During 2020, all of our employees engaged in training to learn to recognize and address the effects of unconscious bias by challenging assumptions; encouraging diversity of experience, opinion, and expression; and supporting a workplace culture that actively strives to be more inclusive. As of December 31, 2020, approximately 14% of our global workforce was female and 15% of the Company’s employees in managerial roles were female. Minorities represented approximately 14% of the Company’s U.S. workforce and 12% of our U.S. employees in managerial roles. In order to continue to improve the inclusiveness and diversity of our company and culture, our recently
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announced comprehensive ESG goals include goals to increase the representation of females and persons of color in senior leadership roles and to implement a program designed to increase the hiring and promotion of minority and female candidates.
Workforce Health and Safety. Operating in a safe and responsible manner is a core value and an integral part of what sets the Company apart. We believe that focusing on leading indicators - such as the behavioral safety practices we have incorporated into our annual incentive plan - to drive and measure activities that prevent and control safety incidents, results in our industry-leading safety record. As of December 31, 2020, our 12-month rolling average recordable incident rate (RIR) was 0.14 incidents per 200,000 work hours, and our total recordable injury count was four. For the year ended December 31, 2020, our days away, restricted or transferred (DART) incident rate was 0.03 injuries per 200,000 work hours, and our lost time incident rate was 0.00.
Response to COVID-19 Pandemic. During fiscal 2020, in response to the COVID-19 pandemic, we implemented safety precautions to protect the health and well-being of all of our employees, including the manufacturing workforce who operate our nitrogen manufacturing complexes and distribution facilities. See Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Overview of CF Holdings—Market Conditions and Current Developments—COVID-19 Pandemic, for a further discussion of the pandemic and the actions we have taken.
Talent Development. A core aspect of our culture is our commitment to identifying and developing talent to help employees accelerate growth and achieve their career goals. We invest in extensive assessment, training and professional development opportunities for our employees through a robust set of formal and informal programs, including targeted job movements, key experiences, and training, with an emphasis on creating a culture of inclusion. Leadership is the quality that drives our values and sets us apart. To help foster leadership, we have developed a set of leadership competencies that provide a common language for how to demonstrate leadership at every level of the organization. We view training and development programs as being a key part of succession planning, allowing us to grow a stronger company today and in the future.
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ITEM 1A.    RISK FACTORS.
In addition to the other information contained in this Annual Report on Form 10-K, you should carefully consider the factors discussed below before deciding to invest in any of our securities. These risks and uncertainties, individually or in combination, could materially and adversely affect our business, financial condition, results of operations and cash flows.
Market Risks
Our business is cyclical, resulting in periods of industry oversupply during which our business, financial condition, results of operations and cash flows tend to be negatively affected.
Historically, selling prices for our products have fluctuated in response to periodic changes in supply and demand conditions. Demand for nitrogen is affected by planted acreage, crop selection and fertilizer application rates, driven by population growth, gross domestic product growth, changes in dietary habits and non-food use of crops, such as production of ethanol and other biofuels among other things. Demand also includes industrial uses of nitrogen, for example chemical manufacturing and emissions reductants such as diesel exhaust fluid (DEF). Supply is affected by available capacity and operating rates, raw material costs and availability, energy prices, government policies and global trade.
Periods of strong demand, high capacity utilization and increasing operating margins tend to stimulate global investment in production capacity. In recent years, fertilizer producers, including CF Holdings, have built new production facilities or expanded capacity of existing production assets, or announced plans to do so. The construction of new nitrogen fertilizer manufacturing capacity in the industry, plus improvements to increase output from the existing production assets, increase nitrogen supply availability and affect the balance of supply and demand. In certain years, global nitrogen fertilizer capacity has increased faster than global nitrogen fertilizer demand, creating a surplus of global nitrogen fertilizer capacity, which led to lower nitrogen fertilizer selling prices in 2016 and 2017. For example, in the two-year period ended December 31, 2017, additional production capacity came on line and, at the same time, the average selling price for our products declined 34%, from $314 per ton in 2015 to $207 per ton in 2017.
Additional production capacity is expected to come on line over the next 12 months outside of North America. We cannot predict the impact of this additional capacity. Also, global or local economic and financial conditions or changes in such conditions, or other factors may cause acceleration of other announced and/or ongoing projects.
Price fluctuations for our products result from changes in supply and demand. Significant price fluctuations we experience could be symptoms of an oversupplied market in transition as new capacity ramps up, and production slows down or shuts down in high cost regions. Similarly, lower energy prices can spur increases in production in high cost regions, which would result in increased supply and pressure on selling prices. Additionally, trade flows adjust as imports into different regions of the world also impact the local supply and demand balances. If imports increase into an oversupplied region, lower prices in that region could result.
During periods of industry oversupply, our financial condition, results of operations and cash flows tend to be affected negatively as the price at which we sell our products typically declines, resulting in possible reduced profit margins, write-downs in the value of our inventory and temporary or permanent curtailments of production. In 2016 and 2017, our financial performance, credit ratings and the trading price for our common stock were negatively impacted by the lower selling prices resulting from the global oversupply of nitrogen fertilizer; while in 2018 and 2019, we experienced increases in the average selling price for our products. In 2020, the average selling price for our products decreased 14% to $203 per ton compared to $235 per ton in 2019. The period of time that these oversupply conditions can persist and the degree to which they will impact our business, financial condition, results of operations and cash flows are uncertain.
Our nitrogen products are global commodities, and we face intense global competition from other producers.
We are subject to intense price competition from our competitors. Most fertilizers and related nitrogen products that we produce, such as industrial grade ammonium nitrate and DEF, are global commodities, with little or no product differentiation, and customers make their purchasing decisions principally on the basis of delivered price and, to a lesser extent, customer service and product quality. As a consequence, conditions in the international market for nitrogen products significantly influence our operating results.
We compete with many producers, including state-owned and government-subsidized entities. Some of our competitors have greater total resources and are less dependent on earnings from fertilizer sales, which make them less vulnerable to industry downturns and better positioned to pursue new expansion and development opportunities. Furthermore, certain governments, in some cases as owners of some of our competitors, may be willing to accept lower prices and profitability on their products or subsidize production or consumption in order to support domestic employment or other political or social
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goals. Our competitive position could suffer to the extent we are not able to expand our own resources, either through investments in new or existing operations or through acquisitions, joint ventures or partnerships.
China, the world’s largest producer and consumer of nitrogen fertilizers, currently has significant capacity surplus and many high-cost plants. As a result, the domestic nitrogen industry in China is operating at less than full capacity. If Chinese government policy, devaluation of the Chinese renminbi, the relaxation of Chinese environmental standards or decreases in Chinese producers’ underlying costs such as the price of Chinese coal encourage increased production capacity utilization, any resulting export volume could adversely affect the balance between global supply and demand and may put downward pressure on global fertilizer prices, which could materially adversely affect our business, financial condition, results of operations and cash flows.    
Our competitors in Russia continue to benefit from non-market pricing of natural gas, allowing continued exports from the region, and have significant nitrogen fertilizer export capacity. The 2016 revocations of U.S. antidumping measures on solid urea and fertilizer grade ammonium nitrate from Russia have allowed for increases in imports from that country into the United States in recent years.
We also face competition from other fertilizer producers in the Middle East, Europe, Latin America and Africa, who, depending on market conditions, fluctuating input prices, geographic location and freight economics, may take actions at times with respect to price or selling volumes that adversely affect our business, financial condition, results of operations and cash flows.
In addition, the international market for nitrogen products is influenced by such factors as currency exchange rates, including the relative value of the U.S. dollar and its impact upon the cost of importing of nitrogen products into the United States, foreign agricultural policies, the existence of, or changes in, import or foreign currency exchange barriers in certain foreign markets and the laws and policies of the markets in which we operate, including the imposition of new duties, tariffs or quotas, that affect foreign trade and investment. For example, the imposition of duties, tariffs or quotas in a region can directly impact product pricing in that region, which can lead to changes in global trade flows and impact the global supply and demand balance and pricing. Market participants customarily move product between regions of the world, or adjust trade flows, in response to these factors. North America, where we manufacture and sell most of our products, is one of the largest and most liquid nitrogen trading regions in the world. As a result, other manufacturers, traders and other market participants can move nitrogen products to North America when there is uncertainty associated with the supply and demand balance in other regions or when duties, tariffs or quotas impact prices or trade flows in other regions. As a result, duties, tariffs and quotas can lead to uncertainty in the global marketplace and impact the supply and demand balance in many regions, which could adversely affect our business, financial condition, results of operations and cash flows. On October 9, 2019, the European Commission (the Commission) imposed definitive anti-dumping duties on imports to the European Union of UAN manufactured in Russia, the Republic of Trinidad and Tobago and the United States. For imports of UAN manufactured in the United States, the fixed duty rate is €29.48 per metric ton (or €26.74 per ton). The duties will remain in place for an initial five-year period, after which the measures may be renewed by the Commission. The long term impact of this duty on the international market for nitrogen products is uncertain.
A decline in agricultural production or limitations on the use of our products for agricultural purposes could materially adversely affect the demand for our products.
Conditions in the United States, Europe, India, Brazil, China and other global agricultural areas significantly impact our operating results. Agricultural planted areas and production can be affected by a number of factors, including weather patterns and field conditions, current and projected grain inventories and prices, crop disease and/or livestock disease, demand for agricultural products and governmental policies regarding production of or trade in agricultural products. These factors are outside of our control.
Governmental policies, including farm and biofuel subsidies, commodity support programs and tariffs, as well as the prices of fertilizer products, may also directly or indirectly influence the number of acres planted, the mix of crops planted and the use of fertilizers for particular agricultural applications. Ethanol production in the United States contributes significantly to corn demand, representing approximately 35% of total U.S. corn demand, due in part to federal legislation mandating use of renewable fuels. An increase in ethanol production has led to an increase in the amount of corn grown in the United States and to increased fertilizer usage on both corn and other crops that have also benefited from improved farm economics. While the current Renewable Fuel Standard encourages continued high levels of corn-based ethanol production, various interested parties have called to eliminate or reduce the renewable fuel mandate, or to eliminate or reduce corn-based ethanol as part of the renewable fuel mandate. Other factors that drive the ethanol market include the prices of ethanol, gasoline and corn. Lower gasoline prices and fewer aggregate miles, driven by increased automobile fuel efficiency or the continued expansion of electric
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vehicles, may put pressure on ethanol prices that could result in reduced profitability and lower production for the ethanol industry. This could have an adverse effect on corn-based ethanol production, planted corn acreage and fertilizer demand.
Developments in crop technology, such as nitrogen fixation, the conversion of atmospheric nitrogen into compounds that plants can assimilate, or nitrogen-efficient varieties, or developments in alternatives to traditional animal feed or alternative proteins, could also reduce the use of chemical fertilizers and adversely affect the demand for our products. Widespread adoption of emerging application technologies or alternative farming techniques could disrupt traditional application practices, affecting the volume or types of products used and timing of applications. In addition, from time to time various foreign government and U.S. state legislatures have considered limitations on the use and application of chemical fertilizers due to concerns about the impact of these products on the environment. For example, the United Kingdom is currently consulting with stakeholders and reviewing proposals to limit emissions from solid urea fertilizers, including a potential ban on urea fertilizers. While CF Fertilisers UK Limited does not sell solid urea fertilizer in the United Kingdom, other jurisdictions may consider limits on fertilizer use, such as the European Union, which announced its Farm to Fork and Biodiversity Strategies. Any reduction in the demand for chemical fertilizer products, including as a result of technological developments and/or limitations on the use and application of chemical fertilizers, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Our business is dependent on natural gas, the prices of which are subject to volatility.
Nitrogen from the atmosphere and hydrogen from natural gas, coal and other carbon energy feedstocks, or from the electrolysis of water, are the fundamental building blocks of nitrogen fertilizers. Energy feedstock costs comprise a significant portion of the total production cost of nitrogen products and, relative to the industry’s marginal producers that set the global price of nitrogen, generally determine profitability for nitrogen producers. Our manufacturing processes utilize natural gas as the principal raw material used in our production of nitrogen fertilizers. We use natural gas both as a chemical feedstock and as a fuel to produce ammonia, granular urea, urea ammonium nitrate solution (UAN), ammonium nitrate (AN) and other nitrogen products.
Most of our nitrogen fertilizer manufacturing facilities are located in the United States and Canada. As a result, North American natural gas comprises a significant portion of the total production cost of our products. In recent years, the cost of North American natural gas for the production of nitrogen fertilizers has been significantly lower than the energy costs of the industry’s marginal nitrogen producers. Changes in the supply of and demand for natural gas can lead to extended periods of higher natural gas prices. If high natural gas prices were to persist in North America and significantly erode our favorable energy cost differentials relative to the marginal nitrogen producers, it could have a material adverse effect on our business, financial condition, results of operations and cash flows.
The price of natural gas in North America has been volatile in recent years. During 2020, the daily closing price at the Henry Hub, the most heavily-traded natural gas pricing point in North America, reached a low of $1.34 per MMBtu on September 22, 2020 and three consecutive days in October and a high of $3.08 per MMBtu on October 27, 2020. During the three-year period ended December 31, 2020, the daily closing price at the Henry Hub reached a low of $1.34 per MMBtu on September 22, 2020 and three consecutive days in October 2020 and a high of $6.88 per MMBtu on January 4, 2018.
We also have manufacturing facilities located in the United Kingdom. These facilities are subject to fluctuations associated with the price of natural gas in Europe, which has also been volatile in recent years. The major natural gas trading point for the United Kingdom is the National Balancing Point (NBP). During 2020, the daily closing price at NBP reached a low of $1.04 per MMBtu on May 22, 2020 and a high of $7.71 per MMBtu on December 30, 2020. During the three-year period ended December 31, 2020, the daily closing price at NBP reached a low of $1.04 per MMBtu on May 22, 2020 and a high of $31.74 per MMBtu on March 2, 2018.
The price of natural gas in North America and worldwide has been volatile in recent years and has declined on average due in part to the development of significant natural gas reserves, including shale gas, and the rapid improvement in shale gas extraction techniques, such as hydraulic fracturing and horizontal drilling. Future production of natural gas from shale formations could be reduced by regulatory changes that restrict drilling or hydraulic fracturing or increase its cost or by reduction in oil exploration and development prompted by lower oil prices resulting in production of less associated gas.
Certain of our operating facilities are located near natural gas hubs that have experienced increased natural gas development and have favorable basis differences as compared to other North American hubs. Favorable basis differences in certain regions may dissipate over time due to increases in natural gas pipeline or storage capacity in those regions. Additionally, basis differentials may become materially unfavorable due to a lack of inbound gas pipeline or storage capacity in other regions during periods of unusually high demand. Increased demand for natural gas, particularly in the Gulf Coast Region, due to increased industrial demand and increased natural gas exports, could result in increased natural gas prices. If such reduced production, increased demand or changes in basis were to occur, or if other developments adversely impact the
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supply and demand balance for natural gas in North America or elsewhere, natural gas prices could rise, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Adverse weather conditions may decrease demand for our fertilizer products, increase the cost of natural gas or materially disrupt our operations.
Weather conditions that delay or disrupt field work during the planting, growing, harvesting or application periods may cause agricultural customers to use different forms of nitrogen fertilizer, which may adversely affect demand for the forms that we sell or may impede farmers from applying our fertilizers until the following application period, resulting in lower seasonal demand for our products.
Adverse weather conditions during or following harvest may delay or eliminate opportunities to apply fertilizer in the fall. Weather can also have an adverse effect on crop yields, which could lower the income of growers and impair their ability to purchase fertilizer from our customers. Adverse weather conditions could also impact transportation of fertilizer, which could disrupt our ability to deliver our products to customers on a timely basis. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in fertilizer applications, planting schedules and purchasing patterns. Over the longer-term, changes in weather patterns may shift the periods of demand for products and even the regions to which our products are distributed, which could require us to evolve our distribution system.
In addition, we use the North American waterway system extensively to ship products from some of our manufacturing facilities to our distribution facilities and our customers, and we also export nitrogen fertilizer products via seagoing vessels from deep-water docking facilities at certain of our manufacturing sites. Therefore, persistent significant changes in river or ocean water levels (either up or down, such as a result of flooding or drought for example), may require changes to our operating and distribution activities and/or significant capital improvements to our facilities.
Weather conditions or, in certain cases, weather forecasts, also can disrupt our operations and can affect the price of natural gas, the principal raw material used to make our nitrogen fertilizer products. Colder and/or longer than normal winters and warmer than normal summers increase the demand for natural gas for power generation and for residential and industrial use, which can increase the cost and/or decrease the availability of natural gas. In addition, adverse weather events can not only cause loss of power at our facilities disrupting our operations, but also can impact the supply of natural gas and utilities and cause prices to rise.
Our operating results fluctuate due to seasonality. Our inability to predict future seasonal fertilizer demand accurately could result in our having excess inventory, potentially at costs in excess of market value.
The fertilizer business is seasonal. The degree of seasonality of our business can change significantly from year to year due to conditions in the agricultural industry and other factors. The strongest demand for our products in North America occurs during the spring planting season, with a second period of strong demand following the fall harvest. In contrast, we and other fertilizer producers generally manufacture and distribute products throughout the year. As a result, we and/or our customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application seasons and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in our sales volumes and net sales being the highest during the spring and our working capital requirements being the highest just prior to the start of the spring planting season.
If seasonal demand is less than we expect, we may be left with excess inventory that will have to be stored (in which case our results of operations would be negatively affected by any related increased storage costs) or liquidated (in which case the selling price could be below our production, procurement and storage costs). The risks associated with excess inventory and product shortages are exacerbated by the volatility of nitrogen fertilizer prices and the relatively brief periods during which farmers can apply nitrogen fertilizers. If prices for our products rapidly decrease, we may be subject to inventory write-downs, adversely affecting our operating results.
A change in the volume of products that our customers purchase on a forward basis, or the percentage of our sales volume that is sold to our customers on a forward basis, could increase our exposure to fluctuations in our profit margins and materially adversely affect our business, financial condition, results of operations and cash flows.
We offer our customers the opportunity to purchase products from us on a forward basis at prices and delivery dates we propose. Under our forward sales programs, customers generally make an initial cash down payment at the time of order and pay the remaining portion of the contract sales value in advance of the shipment date. Forward sales improve our liquidity by reducing our working capital needs due to the cash payments received from customers in advance of shipment of the product
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and allow us to improve our production scheduling and planning and the utilization of our manufacturing and distribution assets.
Any cash payments received in advance from customers in connection with forward sales are reflected on our consolidated balance sheets as a current liability until the related orders are shipped, which can take up to several months.
We believe the ability to purchase products on a forward basis is most appealing to our customers during periods of generally increasing prices for nitrogen fertilizers. Our customers may be less willing or even unwilling to purchase products on a forward basis during periods of generally decreasing or stable prices or during periods of relatively high fertilizer prices due to the expectation of lower prices in the future or limited capital resources. In periods of rising fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in lower profit margins than if we had not sold fertilizer on a forward basis. Conversely, in periods of declining fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in higher profit margins than if we had not sold fertilizer on a forward basis. In addition, fixing the selling prices of our products, often months in advance of their ultimate delivery to customers, typically causes our reported selling prices and margins to differ from spot market prices and margins available at the time of shipment.
Operational Risks
Our operations are dependent upon raw materials provided by third parties, and any delay or interruption in the delivery of raw materials may adversely affect our business.
We use natural gas and other raw materials in the manufacture of nitrogen products. We purchase the natural gas and other raw materials from third party suppliers. Our natural gas is transported by pipeline to our facilities by third party transportation providers or through the use of facilities owned by third parties. Delays or interruptions in the delivery of natural gas or other raw materials may be caused by, among other things, severe weather or natural disasters, unscheduled downtime, labor difficulties, insolvency of our suppliers or their inability to meet existing contractual arrangements, deliberate sabotage and terrorist incidents, or mechanical failures. In addition, the transport of natural gas by pipeline is subject to additional risks, including delays or interruptions caused by capacity constraints, leaks or ruptures. Any delay or interruption in the delivery of natural gas or other raw materials, even for a limited period, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Our transportation and distribution activities rely on third party providers and are subject to environmental, safety and regulatory oversight. This exposes us to risks and uncertainties beyond our control that may adversely affect our operations and exposes us to additional liability.
We rely on natural gas pipelines to transport raw materials to our manufacturing facilities. In addition, we rely on railroad, barge, truck, vessel and pipeline companies to coordinate and deliver finished products to our distribution system and to ship finished products to our customers. We also lease rail cars in order to ship raw materials and finished products. These transportation operations, equipment and services are subject to various hazards, including adverse operating conditions on the inland waterway system, extreme weather conditions, system failures, work stoppages, shutdowns, delays, accidents such as spills and derailments, vessel groundings and other accidents and operating hazards. Additionally, due to the aging infrastructure of certain rail lines, bridges, roadways, pipelines, river locks, and equipment that our third party service providers utilize, we may experience delays in both the receipt of raw materials or the shipment of finished product while repairs, maintenance or replacement activities are conducted. Also, certain third party service providers, such as railroads, have experienced periodic service delays or shutdowns due to capacity constraints in their systems, operational and maintenance difficulties, blockades, weather or safety-related embargoes and delays, and other events, which could impact the shipping of our products and cause disruption in our supply chain.
These transportation operations, equipment and services are also subject to environmental, safety, and regulatory oversight. Due to concerns related to accidents, discharges or other releases of hazardous substances, terrorism or the potential use of fertilizers as explosives, governmental entities could implement new or more stringent regulatory requirements affecting the transportation of raw materials or finished products.
If shipping of our products is delayed or we are unable to obtain raw materials as a result of these transportation companies’ failure to operate properly, or if new and more stringent regulatory requirements were implemented affecting transportation operations or equipment, or if there were significant increases in the cost of these services or equipment, our revenues and cost of operations could be adversely affected. In addition, increases in our transportation costs, or changes in such costs relative to transportation costs incurred by our competitors, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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In the United States and Canada, the railroad industry continues various efforts to limit the railroads’ potential liability stemming from the transportation of Toxic Inhalation Hazard materials, such as the anhydrous ammonia we transport to and from our manufacturing and distribution facilities. For example, various railroads shift liability to shippers by contract, purport to shift liability to shippers by tariff, or otherwise seek to require shippers to indemnify and defend the railroads from and against liabilities (including in negligence, strict liability, or statutory liability) that may arise from certain acts or omissions of the railroads, third parties who may have insufficient resources, or the Company, unknown causes or acts of god. These initiatives could materially and adversely affect our operating expenses and potentially our ability to transport anhydrous ammonia and increase our liability for releases of our anhydrous ammonia while in the care, custody and control of the railroads, third parties or us, for which our insurance may be insufficient or unavailable. New or more stringent regulatory requirements also could be implemented affecting the equipment used to ship our raw materials or finished products. Restrictions on service, increases in transportation costs, or changes in such costs relative to transportation costs incurred by our competitors, and any railroad industry initiatives that may impact our ability to transport our products, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
We are subject to risks relating to our information technology systems, and any technology disruption or cybersecurity incident could negatively affect our operations.
We rely on internal and third-party information technology and computer control systems in many aspects of our business, including internal and external communications, the management of our accounting, financial and supply chain functions and plant operations. If we do not allocate and effectively manage the resources necessary to build and sustain the proper technology infrastructure, we could be subject to transaction errors, processing inefficiencies, the loss of customers, business disruptions, or the loss of or damage to our confidential business information due to a security breach. In addition, our information technology systems may be damaged, disrupted or shut down due to attacks by computer hackers, computer viruses, employee error or malfeasance, power outages, hardware failures, telecommunication or utility failures, catastrophes or other unforeseen events, and in any such circumstances our system redundancy and other disaster recovery planning may be ineffective or inadequate. Security breaches of our systems (or the systems of our customers, suppliers or other business partners) could result in the misappropriation, destruction or unauthorized disclosure of confidential information or personal data belonging to us or to our employees, business partners, customers or suppliers, and may subject us to legal liability.
As with most large systems, our information technology systems have in the past been, and in the future likely will be, subject to computer viruses, malicious codes, unauthorized access and other cyber attacks, and we expect the sophistication and frequency of such attacks to continue to increase. To date, we are not aware of any significant impact on our operations or financial results from such attempts; however, unauthorized access could disrupt our business operations, result in the loss of assets, and have a material adverse effect on our business, financial condition, or results of operations. Any of the attacks, breaches or other disruptions or damage described above could: interrupt our operations at one or more sites; delay production and shipments; result in the theft of our and our customers’ intellectual property and trade secrets; damage customer and business partner relationships and our reputation; result in legal claims and proceedings, liability and penalties under privacy or other laws, or increased costs for security and remediation; or raise concerns regarding our accounting for transactions. Each of these consequences could adversely affect our business, reputation and our financial statements.
Our business involves the use, storage, and transmission of information about our employees, customers, and suppliers. The protection of such information, as well as our proprietary information, is critical to us. The regulatory environment surrounding information security and privacy is increasingly demanding, with the frequent imposition of new and constantly changing requirements. We have established policies and procedures to help protect the security and privacy of this information. Breaches of our security measures or the accidental loss, inadvertent disclosure, or unapproved dissemination of proprietary information or sensitive or confidential data about us or our employees, customers or suppliers, including the potential loss or disclosure of such information or data as a result of fraud, trickery, or other forms of deception, could expose us or our employees, customers, suppliers or other individuals affected to a risk of loss or misuse of this information, which could ultimately result in litigation and potential legal and financial liability. These events could also damage our reputation or otherwise harm our business.
We are reliant on a limited number of key facilities.
Our nitrogen fertilizer operations are located at nine separate nitrogen complexes, the largest of which is the Donaldsonville complex, which represented approximately 40% of our ammonia production capacity as of December 31, 2020. The suspension of operations at any of these complexes could adversely affect our ability to produce our products and fulfill our commitments, and could have a material adverse effect on our business, financial condition, results of operations and cash flows. Operational disruptions could occur for many reasons, including natural disasters, weather, unplanned maintenance and other manufacturing problems, disease, strikes or other labor unrest or transportation interruptions. For example, our
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Donaldsonville complex is located in an area of the United States that experiences a relatively high level of hurricane or high wind activity and several of our complexes are located in areas that experience severe weather. Such storms, depending on their severity and location, have the potential not only to damage our facilities and disrupt our operations, but also to affect adversely the shipping and distribution of our products. Moreover, our facilities may be subject to failure of equipment that may be difficult to replace or have long delivery lead times, due in part to a limited number of suppliers, and could result in operational disruptions.
Acts of terrorism and regulations to combat terrorism could negatively affect our business.
Like other companies with major industrial facilities, we may be targets of terrorist activities. Many of our plants and facilities store significant quantities of ammonia and other materials that can be dangerous if mishandled. Any damage to infrastructure facilities, such as electric generation, transmission and distribution facilities, or injury to employees, who could be direct targets or indirect casualties of an act of terrorism, may affect our operations. Any disruption of our ability to produce or distribute our products could result in a significant decrease in revenues and significant additional costs to replace, repair or insure our assets, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Due to concerns related to terrorism or the potential use of certain fertilizers as explosives, we are subject to various security laws and regulations. In the United States, these security laws include the Maritime Transportation Security Act of 2002 and the Chemical Facilities Anti-Terrorism Standards regulation. In addition, President Obama issued in 2013 Executive Order 13650 Improving Chemical Facility Safety and Security to improve chemical facility safety in coordination with owners and operators. Governmental entities could implement new or impose more stringent regulations affecting the security of our plants, terminals and warehouses or the transportation and use of fertilizers. These regulations could result in higher operating costs or limitations on the sale of our products and could result in significant unanticipated costs, lower revenues and reduced profit margins. We manufacture and sell certain nitrogen products that can be used as explosives. It is possible that governmental entities in the United States or elsewhere could impose additional limitations on the use, sale or distribution of nitrogen products, thereby limiting our ability to manufacture or sell those products, or that illicit use of our products could result in liability for us.
We are subject to risks associated with international operations.
Our international business operations are subject to numerous risks and uncertainties, including difficulties and costs associated with complying with a wide variety of complex laws, treaties and regulations; unexpected changes in regulatory environments; currency fluctuations; tax rates that may exceed those in the United States; earnings that may be subject to withholding requirements; and the imposition of tariffs, exchange controls or other restrictions.
Changes in governmental trade policies can lead to the imposition of new taxes, levies, duties, tariffs or quotas affecting agricultural commodities, fertilizer or industrial products. These can alter costs, trade flows, access to supplies or demand, and regional balances for our products.
Our principal reporting currency is the U.S. dollar and our business operations and investments outside the United States increase our risk related to fluctuations in foreign currency exchange rates. The main currencies to which we are exposed, besides the U.S. dollar, are the Canadian dollar, the British pound and the euro. These exposures may change over time as business practices evolve and economic conditions change. We may selectively reduce some foreign currency exchange rate risk by, among other things, requiring contracted purchases of our products to be settled in, or indexed to, the U.S. dollar or a currency freely convertible into U.S. dollars, or hedging through foreign currency derivatives. These efforts, however, may not be effective and could have a material adverse effect on our business, financial condition, results of operations and cash flows.
We are subject to anti-corruption laws and regulations and economic sanctions programs in various jurisdictions, including the U.S. Foreign Corrupt Practices Act of 1977, the United Kingdom Bribery Act of 2010, the Canadian Corruption of Foreign Public Officials Act, and economic sanctions programs administered by the United Nations, the European Union and the Office of Foreign Assets Control of the U.S. Department of the Treasury, and regulations set forth under the Comprehensive Iran Accountability Divestment Act. As a result of doing business internationally, we are exposed to a risk of violating anti-corruption laws and sanctions regulations applicable in those countries where we, our partners or agents operate. Violations of anti-corruption and sanctions laws and regulations are punishable by civil penalties, including fines, denial of export privileges, injunctions, asset seizures, debarment from government contracts (and termination of existing contracts) and revocations or restrictions of licenses, as well as criminal fines and imprisonment. The violation of applicable laws by our employees, consultants, agents or partners could subject us to penalties and could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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We are subject to antitrust and competition laws in various countries throughout the world. We cannot predict how these laws or their interpretation, administration and enforcement will change over time. Changes in antitrust laws globally, or in their interpretation, administration or enforcement, may limit our existing or future operations and growth.
Financial Risks
Our operations and the production and handling of our products involve significant risks and hazards. We are not fully insured against all potential hazards and risks incident to our business. Therefore, our insurance coverage may not adequately cover our losses.
Our operations are subject to hazards inherent in the manufacture, transportation, storage and distribution of chemical products, including ammonia, which is highly toxic and corrosive. These hazards include: explosions; fires; severe weather and natural disasters; train derailments, collisions, vessel groundings and other transportation and maritime incidents; leaks and ruptures involving storage tanks, pipelines and rail cars; spills, discharges and releases of toxic or hazardous substances or gases; deliberate sabotage and terrorist incidents; mechanical failures; unscheduled plant downtime; labor difficulties and other risks. Some of these hazards can cause bodily injury and loss of life, severe damage to or destruction of property and equipment and environmental damage, and may result in suspension of operations for an extended period of time and/or the imposition of civil or criminal penalties and liabilities.
We maintain property, business interruption, casualty and liability insurance policies, but we are not fully insured against all potential hazards and risks incident to our business. If we were to incur significant liability for which we were not fully insured, it could have a material adverse effect on our business, financial condition, results of operations and cash flows. We are subject to various self-insured retentions, deductibles and limits under these insurance policies. The policies also contain exclusions and conditions that could have a material adverse impact on our ability to receive indemnification thereunder. Our policies are generally renewed annually. As a result of market conditions, our premiums, self-insured retentions and deductibles for certain insurance policies can increase substantially and, in some instances, certain insurance may become unavailable or available only for reduced amounts of coverage. In addition, significantly increased costs could lead us to decide to reduce, or possibly eliminate, coverage. There can be no assurance that we will be able to buy and maintain insurance with adequate limits and reasonable pricing terms and conditions.
In April 2013, there was a fire and explosion at the West Fertilizer Co. fertilizer storage and distribution facility in West, Texas. According to published reports, 15 people were killed and approximately 200 people were injured in the incident, and the fire and explosion damaged or destroyed a number of homes and buildings around the facility. Various subsidiaries of CF Industries Holdings, Inc. (the CF Entities) were named as defendants along with other companies in lawsuits filed in 2013, 2014 and 2015 in the District Court of McLennan County, Texas by the City of West, individual residents of the County and other parties seeking recovery for damages allegedly sustained as a result of the explosion. The cases were consolidated for discovery and pretrial proceedings in the District Court of McLennan County under the caption “In re: West Explosion Cases.” The two-year statute of limitations expired on April 17, 2015. As of that date, over 400 plaintiffs had filed claims, including at least 9 entities, 325 individuals, and 80 insurance companies. Plaintiffs allege various theories of negligence, strict liability, and breach of warranty under Texas law. Although we do not own or operate the facility or directly sell our products to West Fertilizer Co., products that the CF Entities manufactured and sold to others were delivered to the facility and may have been stored at the West facility at the time of the incident. The Court granted in part and denied in part the CF Entities’ Motions for Summary Judgment in August 2015. Over three hundred cases have been resolved pursuant to confidential settlements that have been or we expect will be fully funded by insurance. The remaining cases are in various stages of discovery and pre-trial proceedings. The next group of cases is expected to be set for trial after the Court resumes scheduling civil jury trials currently on hold because of the outbreak of coronavirus disease 2019 (COVID-19) pandemic. We believe we have strong legal and factual defenses and intend to continue defending the CF Entities vigorously in the pending lawsuits. The increased focus on the risks associated with fertilizers as a result of the incident could impact the regulatory environment and requirements applicable to fertilizer manufacturing and storage facilities.
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Our substantial indebtedness could adversely affect our cash flow, prevent us from fulfilling our obligations and impair our ability to pursue or achieve other business objectives.
As of December 31, 2020, we had approximately $4.0 billion of total funded indebtedness, consisting primarily of secured and unsecured senior notes with varying maturity dates between 2021 and 2044, or approximately 40% of our total capitalization, and an additional $750 million of senior secured borrowing availability (reflecting no outstanding borrowings and no outstanding letters of credit) for general corporate purposes under our senior secured revolving credit agreement (as amended, the Revolving Credit Agreement). Our substantial debt service obligations will have an impact on our earnings and cash flow for so long as the indebtedness is outstanding.
Our substantial indebtedness could, as a result of our debt service obligations or through the operation of the financial and other restrictive covenants to which we are subject under the agreements and instruments governing that indebtedness and otherwise, have important consequences. For example, it could:
make it more difficult for us to pay or refinance our debts as they become due during adverse economic and industry conditions because any related decrease in revenues could cause us not to have sufficient cash flows from operations to make our scheduled debt payments;
cause us to be less able to take advantage of significant business opportunities, such as acquisition opportunities, and to react to changes in market or industry conditions;
cause us to use a portion of our cash flow from operations for debt service, reducing the availability of cash to fund working capital and capital expenditures, and other business activities;
cause us to be more vulnerable to general adverse economic and industry conditions;
expose us to the risk of increased interest rates because certain of our borrowings, including borrowings under our Revolving Credit Agreement, could be at variable rates of interest;
make us more leveraged than some of our competitors, which could place us at a competitive disadvantage;
restrict our ability to dispose of assets or otherwise restrict our use of funds from the disposal of assets;
restrict our ability to pay dividends on our common stock or utilize excess cash to repurchase shares of our common stock;
limit our ability to borrow additional monies in the future to fund working capital, capital expenditures and other general corporate purposes; and
result in a downgrade in the credit rating of our indebtedness which could increase the cost of further borrowings.
We expect to consider options to refinance our outstanding indebtedness from time to time. Our ability to obtain any financing, whether through the issuance of new debt securities or otherwise, and the terms of any such financing are dependent on, among other things, our financial condition, financial market conditions within our industry and generally, credit ratings and numerous other factors, including factors beyond our control. Consequently, in the event that we need to access the credit markets, including to refinance our debt, there can be no assurance that we will be able to obtain financing on acceptable terms or within an acceptable timeframe, if at all. An inability to obtain financing with acceptable terms when needed could have a material adverse effect on our business, financial condition, results of operations and cash flows.
The terms of our existing indebtedness allow us to incur significant additional debt in the future. If we incur additional indebtedness, the risks that we face as a result of our leverage could intensify. If our financial condition or operating results deteriorate, our relations with our creditors, including the holders of our outstanding debt securities, the lenders under our Revolving Credit Agreement and our suppliers, may be materially and adversely affected.
A failure to satisfy the financial maintenance covenants under our Revolving Credit Agreement or a breach of the covenants under any of the agreements governing our indebtedness could limit the borrowing availability under our Revolving Credit Agreement or result in an event of default under such agreements.
Our ability to comply with the covenants in the agreements and instruments governing our indebtedness, including the consolidated interest coverage ratio and consolidated net leverage ratio maintenance covenants contained in our Revolving Credit Agreement, will depend upon our future performance and various other factors, such as market prices for our nitrogen products, natural gas prices and other business, competitive and regulatory factors, many of which are beyond our control. We may not be able to maintain compliance with all of these covenants. In that event, we may not be able to access the borrowing availability under our Revolving Credit Agreement and we would need to seek an amendment to our debt agreements or would need to refinance our indebtedness. There can be no assurance that we can obtain future amendments or waivers of our debt agreements and instruments, or refinance our debt, and, even if we were able to do so, such relief might only last for a limited period, potentially necessitating additional amendments, waivers or refinancings. Any noncompliance by us with the covenants under our debt agreements and instruments could result in an event of default under those debt agreements and instruments. An event of default under an agreement or instrument governing any of our indebtedness may allow our creditors to accelerate the
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related debt and may result in the acceleration of any other debt to which a cross-acceleration or cross-default provision applies. If our lenders or holders of our debt securities accelerate the repayment of borrowings, we may be forced to liquidate certain assets to repay all or part of our indebtedness, which could materially and adversely impair our business operations. An event of default under our Revolving Credit Agreement would permit the lenders thereunder to terminate all commitments to extend further credit under our Revolving Credit Agreement. Furthermore, our Revolving Credit Agreement and senior secured notes provide for liens on specified collateral to secure our obligations thereunder, and if we were unable to repay amounts due and payable under our Revolving Credit Agreement or the senior secured notes, our Revolving Credit Agreement lenders or holders of the senior secured notes, as applicable, could proceed against the collateral granted to them, which could have a material adverse effect on our business, financial condition and results of operations. In the event our creditors accelerate the repayment of our indebtedness, we cannot assure that we would have sufficient assets to make such repayment.
Potential future downgrades of our credit ratings could adversely affect our access to capital, cause vendors to change their credit terms for doing business with us, and could otherwise have a material adverse effect on us.
As of February 16, 2021, our corporate credit rating by S&P Global Ratings is BB+ with a stable outlook; our corporate credit rating by Moody’s Investor Services, Inc. is Ba1 with a stable outlook; and our corporate credit rating with Fitch Ratings, Inc. is BB+ with a stable outlook.
These ratings and our current credit condition affect, among other things, our ability to access new capital, especially debt, as well as the payment terms that vendors are willing to provide us. Negative changes in these ratings may result in more stringent covenants and higher interest rates under the terms of any new debt, and could cause vendors to shorten our payment terms, require us to pay in advance for materials or services, or provide letters of credit, security, or other credit enhancements in order to do business with us.
Tax matters, including changes in tax laws or rates, adverse determinations by taxing authorities and imposition of new taxes could adversely affect our results of operations and financial condition.
We are subject to taxes in (i) the United States, where most of our operations are located, and (ii) numerous foreign jurisdictions where our subsidiaries are organized or conduct business. Tax rates in the various jurisdictions in which we operate may be subject to significant change. Our future effective tax rate could also be affected by changes in our mix of earnings from countries with differing statutory tax rates and tax systems, changes in valuation of deferred tax assets and liabilities or changes in tax laws or their interpretation.
We are also subject to regular reviews, examinations and audits by the Internal Revenue Service (IRS) and other taxing authorities in jurisdictions where we conduct business. Although we believe our tax estimates are reasonable, if a taxing authority disagrees with the positions we have taken, we could face additional tax liabilities, including interest and penalties. There can be no assurance that payment of such additional amounts upon final adjudication of any disputes will not have a material impact on our results of operations and financial condition.
We have used the cash we generate outside the United States primarily to fund development of our business in non-U.S. jurisdictions. If the funds generated by our U.S. business are not sufficient to meet our need for cash in the United States, we may need to repatriate a portion of our future international earnings to the United States. Under the tax laws of the foreign countries in which we operate, those international earnings could be subject to withholding taxes when repatriated; therefore, the repatriation of those earnings could result in an increase in our worldwide effective tax rate and an increase in our use of cash to pay these taxes.
We also need to comply with other new, evolving or revised tax laws and regulations. The enactment of, or increases in, tariffs or value added taxes, or other changes in the application of existing taxes, in markets in which we are currently active, or may be active in the future, or on specific products that we sell or with which our products compete, could have an adverse effect on our results of operations and financial condition.
The United States and other countries in which we operate are in the process of implementing the Organization for Economic Co-operation and Development’s (OECD) Base Erosion and Profit Shifting Project (BEPS). BEPS is intended to improve tax disclosure and transparency and eliminate structures and activities that could be perceived by a particular country as resulting in tax avoidance. The OECD is currently developing a framework in order to assist member countries in adopting BEPS related legislation. Each country is permitted to introduce its own legislation to implement BEPS legislation. As a number of our business operations do business across country lines, we are subject to BEPS. The implementation of BEPS could result in tax changes and may adversely affect our provision for income taxes, results of operations and cash flows. In some cases, BEPS legislation could result in double taxation in a portion of our profits without an appropriate mechanism to recover the incremental tax amount in another jurisdiction.
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Our business is subject to risks involving derivatives and the risk that our hedging activities might not prevent losses.
We may utilize natural gas derivatives to hedge our financial exposure to the price volatility of natural gas, the principal raw material used in the production of nitrogen-based products. We have used natural gas futures, swaps and option contracts traded in over-the-counter markets or on exchanges. We have also used fixed-price, physical purchase and sales contracts to hedge our exposure to natural gas price volatility. In order to manage our exposure to changes in foreign currency exchange rates, we may from time to time use foreign currency derivatives (primarily forward exchange contracts).
Our use of derivatives can result in volatility in reported earnings due to the unrealized mark-to-market adjustments that occur from changes in the value of the derivatives that do not qualify for, or to which we do not apply, hedge accounting. To the extent that our derivative positions lose value, we may be required to post collateral with our counterparties, adversely affecting our liquidity.
Hedging arrangements are imperfect and unhedged risks will always exist. In addition, our hedging activities may themselves give rise to various risks that could adversely affect us. For example, we are exposed to counterparty credit risk when our derivatives are in a net asset position. The counterparties to our derivatives are multi-national commercial banks, major financial institutions or large energy companies.
Our liquidity could be negatively impacted by a counterparty default on settlement of one or more of our derivative financial instruments or by the triggering of any cross default provisions or credit support requirements against us. Additionally, the International Swaps and Derivative Association master netting arrangements for most of our derivative instruments contain credit-risk-related contingent features, such as cross default provisions and credit support requirements. In the event of certain defaults or a credit ratings downgrade, our counterparty may request early termination and net settlement of certain derivative trades or may require us to collateralize derivatives in a net liability position.
At other times we may not utilize derivatives or derivative strategies to hedge certain risks or to reduce the financial exposure of price volatility. As a result, we may not prevent certain material adverse impacts that could have been mitigated through the use of derivative strategies.
Environmental and Regulatory Risks
We are subject to numerous environmental, health and safety laws, regulations and permitting requirements, as well as potential environmental liabilities, which may require us to make substantial expenditures.
We are subject to numerous environmental, health and safety laws and regulations in the United States, Canada, the United Kingdom, the European Union, the Republic of Trinidad and Tobago and other locations, including laws and regulations relating to the generation and handling of hazardous substances and wastes; the cleanup of hazardous substance releases; the discharge of regulated substances to air or water; and the demolition of existing plant sites upon permanent closure. In the United States, these laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act, the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), the Toxic Substances Control Act and various other federal, state, provincial, local and international laws.
As a producer of nitrogen fertilizer products working with hazardous substances, our business faces risks of spills, discharges or other releases of those substances into the environment. Certain environmental laws, including CERCLA, impose joint and several liability, without regard to fault, for cleanup costs on persons who have disposed of or released hazardous substances into the environment. Given the nature of our business, we have incurred, are incurring currently, and are likely to incur periodically in the future, liabilities under CERCLA and other environmental cleanup laws at our current facilities or facilities previously owned by us or other acquired businesses, adjacent or nearby third-party facilities or offsite disposal locations. The costs associated with future cleanup activities that we may be required to conduct or finance may be material. Additionally, we may become liable to third parties for damages, including personal injury and property damage, resulting from the disposal or release of hazardous substances into the environment.
Violations of environmental, health and safety laws can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. Environmental, health and safety laws change regularly and have tended to become more stringent over time. As a result, we have not always been and may not always be in compliance with all environmental, health and safety laws and regulations. We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial expenditures. Our costs to comply with, or any liabilities under, these laws and regulations could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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From time to time, our production, distribution or storage of anhydrous ammonia has resulted in accidental releases that have temporarily disrupted our operations and/or resulted in liability for administrative penalties and/or claims for personal injury. To date, our costs to resolve these liabilities have not been material. However, we could incur significant costs if our liability coverage is not sufficient to pay for all or a large part of any judgments against us, or if our insurance carrier refuses coverage for these losses.
We hold numerous environmental and other governmental permits and approvals authorizing operations at each of our facilities. Expansion or modification of our operations is predicated upon securing necessary environmental or other permits or approvals. A decision by a government agency to deny or delay issuing a new or renewed regulatory material permit or approval, or to revoke or substantially modify an existing permit or approval, or a determination that we have violated a law or permit as a result of a governmental inspection of our facilities could have a material adverse effect on our ability to continue operations at our facilities and on our business, financial condition, results of operations and cash flows.
Future regulatory or legislative restrictions on greenhouse gas (GHG) emissions in the jurisdictions in which we operate could materially adversely affect our business, financial condition, results of operations and cash flows.
We are subject to GHG regulations in the United Kingdom, Canada and the United States. In the United States, our existing facilities currently are only subject to GHG emissions reporting obligations, although new facilities that we build, or existing facilities that we modify in the future, could be subject to GHG emissions standards included in their air permits. Our facilities in the United Kingdom have been subject to the European Union Emissions Trading System (EU ETS), which generally required us to hold or obtain emissions allowances to offset GHG emissions from those aspects of our operations that are subject to regulation under this program. Notwithstanding the exit of the United Kingdom from the European Union (Brexit) on January 31, 2020, facilities in the United Kingdom remained subject to the EU ETS through the end of 2020. Beginning on January 1, 2021, our U.K. manufacturing plants became subject to the UK Emissions Trading Scheme (UK ETS). At least initially, the UK ETS is expected to be similar to the EU ETS, although the UK government has stated that it intends to establish an emissions cap that is lower than what it would have been had the United Kingdom remained subject to the EU ETS. No agreement has been reached as to whether the UK ETS will establish a linkage with the EU ETS or other national emission trading systems. Our Medicine Hat Nitrogen Complex, in Alberta, Canada, and our Courtright Nitrogen Complex, in Ontario, Canada, are subject to provincial or federal laws that impose a price on excess GHG emissions. Each of these laws establishes carbon dioxide equivalent (CO2e) emissions standards applicable to our facilities in terms of emissions per unit of production, with the provincial laws and the federal law using different formulas for establishing these intensity limits and changes in these limits over time. If CO2e emissions exceed the applicable limits, the excess emissions must be offset, either through obtaining qualifying emission credits or offsets or by making a payment for each ton of excess emissions. The Canadian federal government has announced that it intends to increase the price of excess emissions of CO2e from CAD $40 per ton in 2021 and CAD $50 per ton in 2022, by CAD $15 per ton each year beginning in 2023, with the price of excess CO2e emissions reaching CAD $170 per ton by 2030.
On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement was accepted by the United States and ratified by Canada and the United Kingdom and went into effect in November 2016. The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5ºC above pre-industrial levels. Each signatory is required to develop its own national plan to attain this objective. Increasing concern over the impacts of climate change is driving the signatories to establish ever more ambitious GHG reduction targets. In December 2020, the United Kingdom announced a target to reduce GHG emission 68% from 1990 levels by 2030. The EU has announced a new target to reduce its GHG emission 55% below 1990 levels by 2030. On November 4, 2019, the United States submitted formal notice of its withdrawal from the Paris Agreement, which became effective on November 4, 2020, but on January 20, 2021, President Biden announced that the United States has rejoined the Paris Agreement. This will require the United States to submit its own national plan for reducing GHG emissions. Executive Orders issued by the Biden administration, including in particular an executive order issued on January 27, 2021 focusing on climate change, evidence the Administration’s intent to undertake numerous initiatives in an effort to reduce GHG emissions, including promoting renewable energy development, limiting or prohibiting new oil and gas leases on federal lands, and in general, making climate change considerations a critical component of federal policy.
More stringent GHG regulations, if they are enacted, are likely to have a significant impact on us, because our production facilities emit GHGs such as carbon dioxide and nitrous oxide and because natural gas, a fossil fuel, is a primary raw material used in our nitrogen production process. Regulation of GHGs may require us to make changes in our operating activities that would increase our operating costs, reduce our efficiency, limit our output, require us to make capital improvements to our facilities, increase our costs for or limit the availability of energy, raw materials or transportation, or otherwise materially adversely affect our business, financial condition, results of operations and cash flows. In addition, to the extent that GHG
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restrictions are not imposed in countries where our competitors operate or are less stringent than regulations that may be imposed in the United States, Canada or the United Kingdom, our competitors may have cost or other competitive advantages over us.
Strategic Risks
The market for green and low-carbon ammonia may be slow to develop, may not develop to the size expected or may not develop at all. Moreover, we may not be successful in the development and implementation of our green and low-carbon ammonia projects in a timely or economic manner, or at all, due to a number of factors, many of which are beyond our control.
The market for green and low-carbon ammonia is developing and evolving, may not develop to the size or at the rate we expect, and is dependent in part on the developing market for green and low-carbon hydrogen. These markets are heavily influenced by federal, state and local government laws, regulations and policies concerning carbon emissions and clean energy in the United States and abroad.
We believe the demand for green and low-carbon ammonia will take several years to fully develop and mature and we cannot be certain that this market or the market for green and low-carbon hydrogen will grow to the size or at the rate we expect. Hydrogen currently only accounts for less than 1% of the world’s energy needs.
The recognition and acceptance of green and low-carbon ammonia as a transport and storage mechanism for green and low-carbon hydrogen, the use of green and low-carbon ammonia as a fuel in its own right and the development and growth of end market demand and applications for green and low-carbon hydrogen and green and low-carbon ammonia are uncertain and dependent on a number of factors outside of our control. These factors include, among others, the extent to which and rate at which cost competitive global renewable energy capacity increases, the pricing of alternative sources of energy, the realization of technological improvements required to increase the efficiency and lower the costs of production of green and low-carbon ammonia, the regulatory environment, the rate and extent of infrastructure investment and developments, the availability of tax benefits and other incentives and our ability to provide green and low-carbon ammonia offerings cost-effectively. If a sustainable market fails to develop or develops more slowly than we anticipate, we may decide not to implement, or may not be successful in implementing, one or more elements of our multi-year strategic plan and commitment to a clean fuel economy.
Our clean energy strategy also depends on the realization of certain technical improvements required to increase the efficiency and lower the costs of production of green and low-carbon ammonia. Over time, as we seek to convert additional existing production facilities and further expand our green ammonia and low-carbon ammonia production capacity, we may face operational difficulties and execution risks related to the design, development and construction. If our assumptions about the engineering and process characteristics necessary to successfully build the facility capacity that we are contemplating and to scale up to larger production quantities prove to be incorrect, we may be unable to produce substantial quantities of green or low-carbon ammonia, and the cost to construct or convert such green and low-carbon ammonia facilities, or the production costs associated with the operation of such facilities, may be higher than we project.
We may not be successful in the expansion of our business.
We routinely consider possible expansions of our business, both within the United States and elsewhere. Major investments in our business, including as a result of acquisitions, partnerships, joint ventures, business combination transactions or other major investments, such as our green and low-carbon ammonia projects, require significant managerial resources, the diversion of which from our other activities or opportunities may impair the existing operations of our business. We may be unable to identify or successfully compete for certain acquisition targets, which may hinder or prevent us from acquiring a target or completing other transactions. The risks of any expansion of our business through investments, acquisitions, partnerships, joint ventures or business combination transactions are increased due to the significant capital and other resources that we may have to commit to any such expansion, which may not be recoverable if the expansion initiative to which they were devoted is ultimately not implemented. In addition, these efforts may require capital resources that could otherwise be used for the improvement and expansion of our existing business. As a result of these and other factors, including general economic risk, we may not be able to realize our projected returns from any future acquisitions, partnerships, joint ventures, business combination transactions or other major investments. Among the risks associated with the pursuit and consummation of acquisitions, partnerships, joint ventures or other major investments or business combinations are those involving:
difficulties in integrating the parties’ operations, systems, technologies, products and personnel;
incurrence of significant transaction-related expenses;
potential integration or restructuring costs;
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potential impairment charges related to the goodwill, intangible assets or other assets to which any such transaction relates, in the event that the economic benefits of such transaction prove to be less than anticipated;
other unanticipated costs associated with such transactions;
our ability to achieve operating and financial efficiencies, synergies and cost savings;
our ability to obtain the desired financial or strategic benefits from any such transaction;
the parties’ ability to retain key business relationships, including relationships with employees, customers, partners and suppliers;
potential loss of key personnel;
entry into markets or involvement with products with which we have limited current or prior experience or in which competitors may have stronger positions;
assumption of contingent liabilities, including litigation;
exposure to unanticipated liabilities;
differences in the parties’ internal control environments, which may require significant time and resources to resolve in conformity with applicable legal and accounting standards;
increased scope, geographic diversity and complexity of our operations;
the tax effects of any such transaction; and
the potential for costly and time-consuming litigation, including stockholder lawsuits.
In addition, major capital projects may be dependent on the availability and performance of engineering firms, construction firms, equipment suppliers, transportation providers and other vendors necessary to design and implement those projects on a timely basis and on acceptable terms. Major investments such as capital improvements at our facilities are subject to a number of risks, any of which could prevent us from completing capital projects in a timely or economic manner or at all, including, without limitation, cost overruns, non-performance of third parties, the inability to obtain necessary permits or other permitting matters, adverse weather, defects in materials and workmanship, labor and raw material shortages, transportation constraints, engineering and construction change orders, errors in design, construction or start-up, and other unforeseen difficulties.
International acquisitions, partnerships, joint ventures, investments or business combinations and other international expansions of our business involve additional risks and uncertainties, including, but not limited to:
the impact of particular economic, tax, currency, political, legal and regulatory risks associated with specific countries;
challenges caused by distance and by language and cultural differences;
difficulties and costs of complying with a wide variety of complex laws, treaties and regulations;
unexpected changes in regulatory environments;
political and economic instability, including the possibility for civil unrest;
nationalization of properties by foreign governments;
tax rates that may exceed those in the United States, and earnings that may be subject to withholding requirements;
the imposition of tariffs, exchange controls or other restrictions; and
the impact of currency exchange rate fluctuations.
If we finance acquisitions, partnerships, joint ventures, business combination transactions or other major investments by issuing equity or convertible or other debt securities or loans, our existing stockholders may be diluted or we could face constraints under the terms of, and as a result of the repayment and debt-service obligations under, the additional indebtedness. A business combination transaction between us and another company could result in our stockholders receiving cash or shares of another entity on terms that such stockholders may not consider desirable. Moreover, the regulatory approvals associated with a business combination may result in divestitures or other changes to our business, the effects of which are difficult to predict.
We are subject to risk associated with our strategic venture with CHS Inc. (CHS).
We may not realize the full benefits from our strategic venture with CHS that are expected. The realization of the expected benefits of the CHS strategic venture depends on our ability to operate and manage the strategic venture successfully, and on the market prices of the nitrogen fertilizer products that are the subject of our supply agreement with CHS over the life of the agreement, among other factors. Additionally, any challenges related to the CHS strategic venture could harm our relationships with CHS or our other customers.
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COVID-19 Pandemic Risk
Our business and operations may be adversely affected by the COVID-19 pandemic.
The outbreak and pandemic of the coronavirus disease 2019 (COVID-19) could have a material and adverse effect on our business, financial condition, results of operations or cash flows. The rapid spread of COVID-19 has resulted in governmental authorities implementing numerous measures to try to contain the virus, such as travel bans and restrictions, quarantines, shelter in place orders and shutdowns. Even though our business operations are designated as part of the critical infrastructure by the United States, United Kingdom and Canadian governments and the governments of the states and provinces in which we operate, these measures have impacted and may further impact all or portions of our workforce and operations. If significant portions of our workforce are unable to work effectively, including because of illness, quarantines, government actions, facility closures or other restrictions, we may be unable to meet customer demand or perform fully under our contracts.
In addition, our customers, suppliers and third party service providers, including transportation providers, have been, or may be in the future, affected by COVID-19, including by the impact of measures taken by federal and local governments to slow the spread of the virus. Any negative impacts on our customers, suppliers and third party service providers could negatively impact our business, financial condition, results of operations or cash flows. For example, global demand for nitrogen for industrial use has been negatively affected by the pandemic, and we expect this to continue as long as economic activity remains low due to the impacts of the pandemic. Restrictions on or disruptions of transportation, port closures or increased border controls or closures, or other impacts on domestic and global supply chains or distribution channels, could increase our costs, limit our ability to meet customer demand or otherwise have a material adverse effect on our business, financial condition, results of operations or cash flows.
The COVID-19 pandemic has reduced and may further reduce the demand for energy, including crude oil, as well as natural gas and coal, which are nitrogen feedstocks. Reduced demand for nitrogen feedstocks has reduced and could further reduce the cost of nitrogen production outside of North America, increasing global nitrogen supply and reducing the market prices of our products. Lower demand for crude oil could also reduce the supply and therefore increase the cost of natural gas, which is the principal raw material used in our production of nitrogen fertilizers. In addition, lower crude oil prices, and a reduced demand for gasoline resulting from actions to slow the spread of COVID-19, have reduced ethanol production and therefore negatively impacted the demand for corn, which is a significant factor driving customer demand for our nitrogen fertilizers. The pandemic has also disrupted traditional food supply chains, which may have a material impact on livestock and food demand, including the demand for corn. Each of these consequences could have a material adverse effect on our business, financial condition, results of operations or cash flows.
While the COVID-19 pandemic did not have a material adverse effect on our reported results for the year ended December 31, 2020, we are unable to predict the ultimate impact it may have on our business, financial condition, results of operations or cash flows. The extent to which our operations may be impacted by COVID-19 will depend on future developments, which are highly uncertain and cannot be accurately predicted, including the further spread of the virus, the duration of the COVID-19 outbreak and the type and duration of actions that may be taken by various governmental authorities in response to the outbreak. The pandemic significantly increased global market uncertainty and caused an economic slowdown, which resulted in a global recession. Persistent weakness in economic activity caused by a deterioration of global market and economic conditions could materially adversely affect our business, financial condition, results of operations or cash flows.
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FORWARD LOOKING STATEMENTS
From time to time, in this Annual Report on Form 10-K as well as in other written reports and oral statements, we make forward-looking statements that are not statements of historical fact and may involve a number of risks and uncertainties. These statements relate to analyses and other information that are based on forecasts of future results and estimates of amounts not yet determinable. These statements may also relate to our prospects, future developments and business strategies. We have used the words “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “predict,” “project,” “will” or “would” and similar terms and phrases, including references to assumptions, to identify forward-looking statements in this document. These forward-looking statements are made based on currently available competitive, financial and economic data, our current expectations, estimates, forecasts and projections about the industries and markets in which we operate and management’s beliefs and assumptions concerning future events affecting us. These statements are not guarantees of future performance and are subject to risks, uncertainties and factors relating to our operations and business environment, all of which are difficult to predict and many of which are beyond our control. Therefore, our actual results may differ materially from what is expressed in or implied by any forward-looking statements. We want to caution you not to place undue reliance on any forward-looking statements. We do not undertake any responsibility to release publicly any revisions to these forward-looking statements to take into account events or circumstances that occur after the date of this document. Additionally, we do not undertake any responsibility to provide updates regarding the occurrence of any unanticipated events which may cause actual results to differ from those expressed or implied by the forward-looking statements contained in this document.
Important factors that could cause actual results to differ materially from our expectations are disclosed under “Risk Factors” and elsewhere in this Annual Report on Form 10-K. Such factors include, among others:
the cyclical nature of our business and the impact of global supply and demand on our selling prices;
the global commodity nature of our nitrogen products, the conditions in the international market for nitrogen products, and the intense global competition from other producers;
conditions in the United States, Europe and other agricultural areas;
the volatility of natural gas prices in North America and Europe;
weather conditions;
the seasonality of the fertilizer business;
the impact of changing market conditions on our forward sales programs;
difficulties in securing the supply and delivery of raw materials, increases in their costs or delays or interruptions in their delivery;
reliance on third party providers of transportation services and equipment;
risks associated with cyber security;
our reliance on a limited number of key facilities;
acts of terrorism and regulations to combat terrorism;
risks associated with international operations;
the significant risks and hazards involved in producing and handling our products against which we may not be fully insured;
our ability to manage our indebtedness and any additional indebtedness that may be incurred;
our ability to maintain compliance with covenants under our revolving credit agreement and the agreements governing our indebtedness;
downgrades of our credit ratings;
risks associated with changes in tax laws and disagreements with taxing authorities;
risks involving derivatives and the effectiveness of our risk measurement and hedging activities;
potential liabilities and expenditures related to environmental, health and safety laws and regulations and permitting requirements;
regulatory restrictions and requirements related to greenhouse gas emissions;
the development and growth of the market for green and low-carbon ammonia and the risks and uncertainties relating to the development and implementation of our green and low-carbon ammonia projects;
risks associated with expansions of our business, including unanticipated adverse consequences and the significant resources that could be required;
risks associated with the operation or management of the CHS strategic venture, risks and uncertainties relating to the market prices of the fertilizer products that are the subject of our supply agreement with CHS over the life of the supply agreement, and the risk that any challenges related to the CHS strategic venture will harm our other business relationships; and
the impact of the novel coronavirus disease 2019 (COVID-19) pandemic, including measures taken by governmental authorities to slow the spread of the virus, on our business and operations.
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ITEM 1B.    UNRESOLVED STAFF COMMENTS.
None.
ITEM 2.    PROPERTIES.
Information regarding our facilities and properties is included in Item 1. Business—Reportable Segments and Item 1. Business—Storage Facilities and Other Properties.
Certain of our distribution and storage facilities in the United States are subject to mortgages securing obligations under the Revolving Credit Agreement and our senior secured notes. For additional information, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt.
ITEM 3.    LEGAL PROCEEDINGS.
Litigation
West Fertilizer Co.
On April 17, 2013, there was a fire and explosion at the West Fertilizer Co. fertilizer storage and distribution facility in West, Texas. According to published reports, 15 people were killed and approximately 200 people were injured in the incident, and the fire and explosion damaged or destroyed a number of homes and buildings around the facility. Various subsidiaries of CF Industries Holdings, Inc. (the CF Entities) were named as defendants along with other companies in lawsuits filed in 2013, 2014 and 2015 in the District Court of McLennan County, Texas by the City of West, individual residents of the County and other parties seeking recovery for damages allegedly sustained as a result of the explosion. The cases were consolidated for discovery and pretrial proceedings in the District Court of McLennan County under the caption “In re: West Explosion Cases.” The two-year statute of limitations expired on April 17, 2015. As of that date, over 400 plaintiffs had filed claims, including at least 9 entities, 325 individuals, and 80 insurance companies. Plaintiffs allege various theories of negligence, strict liability, and breach of warranty under Texas law. Although we do not own or operate the facility or directly sell our products to West Fertilizer Co., products that the CF Entities manufactured and sold to others were delivered to the facility and may have been stored at the West facility at the time of the incident.
The Court granted in part and denied in part the CF Entities’ Motions for Summary Judgment in August 2015. Over three hundred cases have been resolved pursuant to confidential settlements that have been or we expect will be fully funded by insurance. The remaining cases are in various stages of discovery and pre-trial proceedings. The next group of cases is expected to be set for trial after the Court resumes scheduling civil jury trials currently on hold because of the coronavirus disease 2019 (COVID-19) pandemic. We believe we have strong legal and factual defenses and intend to continue defending the CF Entities vigorously in the pending lawsuits. The Company cannot provide a range of reasonably possible loss due to the uncertain nature of this litigation, including uncertainties around the potential allocation of responsibility by a jury to other defendants or responsible third parties. The recognition of a potential loss in the future in the West Fertilizer Co. litigation could negatively affect our results in the period of recognition. However, based upon currently available information, including available insurance coverage, we do not believe that this litigation will have a material adverse effect on our consolidated financial position, results of operations or cash flows.
Environmental
For information on pending proceedings relating to environmental remediation matters, see Item 1. Business—Environmental, Health and Safety—CERCLA/Remediation Matters and Note 20—Contingencies to our consolidated financial statements included in Item 8 of this report.
ITEM 4.    MINE SAFETY DISCLOSURES.
Not applicable.
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Our Company
Industry Factors
Items Affecting Comparability of Results
Financial Executive Summary
Results of Consolidated Operations
Year Ended December 31, 2017 ComparedAll references to Year Ended December 31, 2016
Year Ended December 31, 2016 Compared“CF Holdings,” “we,” “us,” “our” and “the Company,” refer to Year Ended December 31, 2015
Operating Results by Business Segment
LiquidityCF Industries Holdings, Inc. and Capital Resources
Off-Balance Sheet Arrangements
Critical Accounting Policiesits subsidiaries, except where the context makes clear that the reference is only to CF Industries Holdings, Inc. itself and Estimates
Recent Accounting Pronouncements
Overviewnot its subsidiaries. All references to “CF Industries” refer to CF Industries, Inc., a 100% owned subsidiary of CF Industries Holdings,
Our Company Inc. Notes referenced throughout this document refer to consolidated financial statement note disclosures that are found in Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements.
We are onea leading global manufacturer of the largest manufacturershydrogen and distributors of nitrogen products for clean energy, fertilizer, productsemissions abatement, and other industrial applications. We operate nitrogen productsmanufacturing complexes in the world.United States, Canada and the United Kingdom, which are among the most cost-advantaged, efficient and flexible in the world, and an extensive storage, transportation and distribution network in North America. Our 3,000 employees focus on safe and reliable operations, environmental stewardship and disciplined capital and corporate management, driving our strategy to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our principal customers are cooperatives, independent fertilizer distributors, farmerstraders, wholesalers and industrial users. Our principalcore product is anhydrous ammonia (ammonia), which contains 82% nitrogen fertilizerand 18% hydrogen. Our nitrogen products that are upgraded from ammonia are granular urea, urea ammonium nitrate solution (UAN) and ammonium nitrate (AN). Our other nitrogen products include diesel exhaust fluid (DEF), urea liquor, nitric acid and aqua ammonia, which are sold primarily to our industrial customers, and compound fertilizer products (NPKs), which are solid granular fertilizer products for which the nutrient content is a combination of nitrogen, phosphorus and potassium. We operate world-class nitrogen manufacturing complexes in Canada, the United Kingdom and the United States, and distribute plant nutrients through a system of terminals, warehouses, and associated transportation equipment located primarily in the Midwestern United States. We also export nitrogen fertilizer products from our Donaldsonville, Louisiana and Yazoo City, Mississippi manufacturing facilities, and our United Kingdom manufacturing facilities in Billingham and Ince.
Our principal assets as of December 31, 2020 include:
fourfive U.S. nitrogen fertilizer manufacturing facilities, located in Donaldsonville, Louisiana (the largest nitrogen fertilizer complex in the world); Port Neal, Iowa; Yazoo City, Mississippi; Verdigris, Oklahoma; and Woodward, Oklahoma. These facilities are wholly owned directly or indirectly by CF Industries Nitrogen, LLC (CFN), of which we own approximately 89% and CHS Inc. (CHS) owns the remainder. See Note 16—Noncontrolling Interests for additional information on our strategic venture with CHS;remainder;
an approximately 75.3% interest in Terra Nitrogen Company, L.P. (TNCLP), a publicly traded limited partnership of which we are the sole general partner and the majority limited partner and which, through its subsidiary Terra Nitrogen, Limited Partnership (TNLP), operates a nitrogen fertilizer manufacturing facility in Verdigris, Oklahoma;
two Canadian nitrogen fertilizer manufacturing facilities, located in Medicine Hat, Alberta (the largest nitrogen fertilizer complex in Canada) and Courtright, Ontario;
two United Kingdom nitrogen manufacturing complexes,facilities, located in Billingham and Ince;

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an extensive system of terminals and associated transportation equipment located primarily in the midwesternMidwestern United States; and
a 50% interest in Point Lisas Nitrogen Limited (PLNL), an ammonia production joint venture located in the Republic of Trinidad and Tobago that we account for under the equity method.
OnWe have a strategic venture with CHS under which CHS owns an equity interest in CFN, a subsidiary of CF Holdings, which represents approximately 11% of the membership interests of CFN. We own the remaining membership interests. CHS also receives deliveries pursuant to a supply agreement under which CHS has the right to purchase annually from CFN up to approximately 1.1 million tons of granular urea and 580,000 tons of UAN at market prices. As a result of its minority equity interest in CFN, CHS is entitled to semi-annual cash distributions from CFN. We are also entitled to semi-annual cash distributions from CFN. See Note 17—Noncontrolling Interests for additional information on our strategic venture with CHS.
For the years ended December 31, 2020, 2019 and 2018, we sold 20.3 million, 19.5 million and 19.3 million product tons generating net sales of $4.12 billion, $4.59 billion and $4.43 billion, respectively.
Our principal executive offices are located outside of Chicago, Illinois, at 4 Parkway North, Suite 400, Deerfield, Illinois 60015, and our telephone number is 847-405-2400. Our Internet website address is www.cfindustries.com. Information made available on our website does not constitute part of this Annual Report on Form 10-K.
We make available free of charge on or through our Internet website, www.cfindustries.com, all of our reports on Forms 10-K, 10-Q and 8-K and all amendments to those reports as soon as reasonably practicable after such material is filed electronically with, or furnished to, the Securities and Exchange Commission (SEC). Copies of our Corporate Governance Guidelines, Code of Corporate Conduct and charters for the Audit Committee, Compensation and Management Development Committee, Corporate Governance and Nominating Committee, and Environmental Sustainability and Community Committee of our Board of Directors (the Board) are also available on our Internet website. We will provide electronic or paper copies of
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these documents free of charge upon request. The SEC also maintains a website at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC.
Our Commitment to a Clean Energy Economy
In October 2020, we announced that we are taking significant steps to support a global hydrogen and clean fuel economy, through the production of green and low-carbon ammonia. Since ammonia is one of the most efficient ways to transport and store hydrogen and is also a fuel in its own right, we believe that the Company, as the world’s largest producer of ammonia, with an unparalleled manufacturing and distribution network and deep technical expertise, is uniquely positioned to fulfill anticipated demand for hydrogen and ammonia from green and low-carbon sources. Our strategy is to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our approach will focus on green ammonia production, which refers to ammonia produced through a carbon-free process, and low-carbon ammonia, which relates to ammonia produced by conventional processes but with CO2 removed through carbon capture and sequestration (CCS) and other certified carbon abatement projects. We have announced an initial green ammonia project at our flagship Donaldsonville nitrogen complex to produce approximately 20,000 tons per year of green ammonia. Additionally, we are developing CCS and other carbon abatement projects across our production facilities that will enable us to produce low-carbon ammonia.
Company History
We were founded in 1946 as Central Farmers Fertilizer Company, and were owned by a group of regional agriculture cooperatives for the first 59 years of our existence. Central Farmers became CF Industries in 1970.
Originally established as a fertilizer brokerage company, we expanded owning and operating fertilizer manufacturing and distribution facilities in the early 1950s with a principal objective of assured supply for our owners. At various times in our history, we manufactured and/or distributed nitrogen, phosphate and potash fertilizers.
We operated as a traditional manufacturing and supply cooperative until 2002, when we adopted a new business model that established financial performance as our principal objective, rather than assured supply to our owners. A critical aspect of the new business model was to establish a more economically driven approach to the marketplace.
In August 2005, we completed our initial public offering (IPO) of common stock, which is listed on the New York Stock Exchange. In connection with the IPO, we consummated a reorganization transaction whereby we ceased to be a cooperative and our pre-IPO owners’ equity interests in CF Industries were canceled in exchange for all of the proceeds of the offering and shares of our common stock. At the time of the IPO, our assets consisted of one wholly owned nitrogen manufacturing facility in Louisiana, United States; a joint venture nitrogen manufacturing facility in Alberta, Canada, of which we owned 66 percent; a phosphate mining and manufacturing operation in Florida, United States; and distribution facilities throughout North America.
In April 2010, we acquired Terra Industries Inc. (Terra), a leading North American producer and marketer of nitrogen fertilizer products for a purchase price of $4.6 billion, which was paid in cash and shares of our common stock. As a result of the Terra acquisition, we acquired five nitrogen fertilizer manufacturing facilities, an approximately 75.3% interest in TNCLP and certain joint venture interests.
In March 2014, we exited our phosphate mining and manufacturing business, which was located in Florida, through a sale to The Mosaic Company for approximately $1.4 billion in cash. As a result, our company became focused solely on nitrogen manufacturing and distribution.
In July 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK Group Limited (formerly known as GrowHow UK Group Limited) (CF Fertilisers UK) not previously owned by us for total consideration of $570 million, and CF Fertilisers UK became wholly owned by us. This transaction added CF Fertilisers UK’s nitrogen manufacturing complexes in Ince, United Kingdom and Billingham, United Kingdom to our consolidated manufacturing capacity.
In February 7,2016, our strategic venture with CHS commenced, at which time CHS made a capital contribution of $2.8 billion to CFN in exchange for membership interests in CFN, which represented approximately 11% of the total membership interests of CFN.
In late 2015 and 2016, we completed certain capacity expansion projects at Donaldsonville, Louisiana and Port Neal, Iowa. These projects, originally announced in 2012, included the construction of new ammonia, urea, and UAN plants at our Donaldsonville, Louisiana complex and new ammonia and urea plants at our Port Neal, Iowa complex. These plants increased our overall production capacity by approximately 25%, improved our product mix flexibility at Donaldsonville, and improved our ability to serve upper-Midwest urea customers from our Port Neal location. The total capital cost of the capacity expansion projects was $5.2 billion.
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Prior to April 2, 2018, Terra Nitrogen, Limited Partnership, which owns and operates our nitrogen manufacturing facility in Verdigris, Oklahoma, was a subsidiary of Terra Nitrogen Company, L.P. (TNCLP). TNCLP was a publicly traded limited partnership of which we were the sole general partner and the majority limited partner, and in which we owned an approximate 75.3% interest.
In 2018, we announced that, in accordance with the terms of TNCLP’s First Amended and Restated Agreement of Limited Partnership (as amended by Amendment No. 1 to the First Amended and Restated Agreement of Limited Partnership, the TNCLP Agreement of Limited Partnership), Terra Nitrogen GP Inc. (TNGP), the sole general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP on(the TNCLP Public Units). On April, 2, 2018, TNGP completed its purchase of the TNCLP Public Units (the Purchase) for aan aggregate cash purchase price of $84.033 per unit in accordance with the terms of TNCLP’s partnership agreement. The purchase price of $84.033 per unit was determined under the terms of TNCLP’s partnership agreement as the average of the daily closing prices per common unit for the 20 consecutive trading days beginning with January 5, 2018 and ending with February 2, 2018. The purchase price of all of the 4,612,562 publicly traded common units of TNCLP is approximately $390$388 million. We intend to fundfunded the purchasePurchase with cash on hand. As of the April 2, 2018 purchase date, all rights of the holders of the units will terminate, with the exception of the right to receive payment of the purchase price. Upon completion of the purchase, we will ownPurchase, CF Holdings owned, through its subsidiaries, 100 percent of the general and limited partnership interests of TNCLP,TNCLP.
Product Tons and Nutrient Tons
Unless otherwise stated, we measure our production and sales volume in this Annual Report on Form 10-K in product tons, which represents the weight of the product measured in short tons (one short ton is equal to 2,000 pounds). References to UAN product tons assume a 32% nitrogen content basis for production volume. 
We also provide certain supplementary volume information measured in nutrient tons. Nutrient tons represent the weight of the product’s nitrogen content, which varies by product. Ammonia represents 82% nitrogen content, granular urea represents 46% nitrogen content, UAN represents between 28% and 32% nitrogen content and AN represents between 29% and 35% nitrogen content. 
Reportable Segments
Our reportable segments consist of the following segments: ammonia, granular urea, UAN, AN and Other. These segments are differentiated by products. We use gross margin to evaluate segment performance and allocate resources. Total other operating costs and expenses (consisting of selling, general and administrative expenses and other operating—net) and non-operating expenses (interest and income taxes), are centrally managed and are not included in the measurement of segment profitability reviewed by management. See Note 21—Segment Disclosures for additional information.
Our Products
Our primary nitrogen products are ammonia, granular urea, UAN and AN. Our historical sales of nitrogen products are shown in the following table. Net sales do not reflect amounts used internally, such as ammonia, in the manufacture of other products.
 202020192018
 Sales Volume (tons)Net SalesSales Volume (tons)Net SalesSales Volume (tons)Net Sales
 (tons in thousands; dollars in millions)
Products   
Ammonia3,767 $1,020 3,516 $1,113 3,135 $1,028 
Granular urea5,148 1,248 4,849 1,342 4,898 1,322 
UAN6,843 1,063 6,807 1,270 7,042 1,234 
AN2,216 455 2,109 506 2,002 460 
Other(1)
2,322 338 2,257 359 2,252 385 
Total20,296 $4,124 19,538 $4,590 19,329 $4,429 

(1)Other segment products include DEF, urea liquor, nitric acid, aqua ammonia and NPKs.
Gross margin was $801 million, $1,174 million and $917 million for the years ended December 31, 2020, 2019 and 2018, respectively.
We own and operate seven nitrogen manufacturing facilities in North America, including five nitrogen manufacturing facilities in the United States, and two in Canada. As of December 31, 2020, the combined production capacity of these seven facilities represented approximately 37%, 42%, 44% and 19% of North American ammonia, granular urea, UAN and AN production capacity, respectively. Each of our nitrogen manufacturing facilities in North America has on-site storage to provide
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flexibility to manage the flow of outbound shipments without impacting production. We also operate two United Kingdom nitrogen manufacturing facilities that produce ammonia, AN and NPKs and serve primarily the British agricultural and industrial markets.
The following table shows the production capacities as of December 31, 2020 at each of our nitrogen manufacturing facilities:
 
Average Annual Capacity(1)
 
Gross
Ammonia(2)
Net
Ammonia(2)
UAN(3)
Urea(4)
AN(5)
Other(6)
 (tons in thousands)
Donaldsonville, Louisiana(7)
4,335 1,390 3,255 2,635 — 445 
Medicine Hat, Alberta1,230 770 — 810 — — 
Port Neal, Iowa1,230 110 800 1,350 — 110 
Verdigris, Oklahoma(8)
1,210 430 1,955 — — — 
Woodward, Oklahoma480 130 810 — — 115 
Yazoo City, Mississippi(8)(9)
570 — 160 — 1,035 125 
Courtright, Ontario(8)(10)
500 265 345 — — 400 
Ince, U.K.(11)
380 15 — — 575 415 
Billingham, U.K.(8)
595 230 — — 625 410 
10,530 3,340 7,325 4,795 2,235 2,020 
Unconsolidated Affiliate      
Point Lisas, Trinidad(12)
360 360 — — — — 
Total10,890 3,700 7,325 4,795 2,235 2,020 

(1)Average annual capacity includes allowance for normal outages and planned maintenance shutdowns.
(2)Gross ammonia capacity includes ammonia used to produce upgraded products. Net ammonia capacity is gross ammonia capacity less ammonia used to produce upgraded products based on the product mix shown in the table.
(3)Measured in tons of UAN containing 32% nitrogen by weight.
(4)Reflects granular urea capacity from the Donaldsonville, Medicine Hat, and Port Neal facilities. Urea liquor and DEF production capacities are included in Other.
(5)AN includes prilled products (Amtrate and industrial-grade AN, or IGAN) and AN solution produced for sale.
(6)Includes product tons of: urea liquor and DEF from the Donaldsonville, Port Neal, Woodward, Yazoo City, and Courtright facilities; nitric acid from the Courtright, Yazoo City, Billingham, and Ince facilities; and NPKs from the Ince facility. Production of DEF can be increased by reducing urea and/or UAN production.
(7)The Donaldsonville facility capacities present an estimated production mix. This facility is capable of producing between 2.4 million and 3.3 million tons of granular urea and between 1.2 million and 4.3 million tons of UAN annually. The facility is also capable of producing up to 1.2 million product tons of 32.5% DEF.
(8)Reduction of UAN or AN production at the Yazoo City, Courtright, Verdigris, and Billingham facilities can allow more merchant nitric acid to be made available for sale.
(9)The Yazoo City facility’s production capacity depends on product mix. With the facility maximizing the production of AN products, 160,000 tons of UAN can be produced. UAN production can be increased to 450,000 tons by reducing the production of AN to 900,000 tons.
(10)Production of urea liquor and DEF at the Courtright facility can be increased by reducing UAN production.
(11)The Ince facility can increase production of NPKs and nitric acid by reducing AN production.
(12)Represents our 50% interest in the capacity of PLNL.

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The following table summarizes our production volume for the last three years:
 December 31,
 202020192018
 (tons in thousands)
Ammonia(1)
10,353 10,246 9,805 
Granular urea5,001 4,941 4,837 
UAN (32%)6,677 6,768 6,903 
AN2,115 2,128 1,731 

(1)Gross ammonia production, including amounts subsequently upgraded on-site into granular urea, UAN or AN.
Donaldsonville, Louisiana
The Donaldsonville facility is the world’s largest and most flexible nitrogen complex. It has six ammonia plants, five urea plants, four nitric acid plants, three UAN plants, and one DEF plant. The complex, which is located on the Mississippi River, includes deep-water docking facilities, access to an ammonia pipeline, and truck and railroad loading capabilities. The complex has on-site storage for 140,000 tons of ammonia, 201,000 tons of UAN (measured on a 32% nitrogen content basis) and 130,000 tons of granular urea.
Medicine Hat, Alberta, Canada
The Medicine Hat facility, located in southeast Alberta, is the largest nitrogen complex in Canada. It has two ammonia plants and one urea plant. The complex has on-site storage for 60,000 tons of ammonia and 60,000 tons of granular urea.
Port Neal, Iowa
The Port Neal facility is located approximately 12 miles south of Sioux City, Iowa, on the Missouri River. The facility consists of two ammonia plants, three urea plants, two nitric acid plants and one UAN plant. The location has on-site storage for 85,000 tons of ammonia, 130,000 tons of granular urea, and 100,000 tons of 32% UAN.
Verdigris, Oklahoma
The Verdigris facility is located northeast of Tulsa, Oklahoma, near the Verdigris River. It is the second largest UAN production facility in North America. The facility comprises two ammonia plants, two nitric acid plants, two UAN plants and a port terminal. We lease the port terminal from the Tulsa-Rogers County Port Authority. The complex has on-site storage for 60,000 tons of ammonia and 100,000 tons of 32% UAN.
Woodward, Oklahoma
The Woodward facility is located in rural northwest Oklahoma and consists of one ammonia plant, two nitric acid plants, two urea plants and two UAN plants. The facility has on-site storage for 36,000 tons of ammonia and 84,000 tons of 32% UAN.
Yazoo City, Mississippi
The Yazoo City facility is located in central Mississippi and includes one ammonia plant, four nitric acid plants, one AN plant, two urea plants, one UAN plant and a dinitrogen tetroxide production and storage facility. The site has on-site storage for 50,000 tons of ammonia, 48,000 tons of 32% UAN and 11,000 tons of AN and related products.
Courtright, Ontario, Canada
The Courtright facility is located south of Sarnia, Ontario near the St. Clair River. The facility consists of an ammonia plant, a UAN plant, a nitric acid plant and a urea plant. The location has on-site storage for 64,000 tons of ammonia and 16,000 tons of 32% UAN.
Ince, United Kingdom
The Ince facility is located in northwestern England and consists of one ammonia plant, three nitric acid plants, one AN plant and three NPK plants. The location has on-site storage for 11,000 tons of ammonia, 95,000 tons of AN, and 40,000 tons of NPKs.
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Billingham, United Kingdom
The Billingham facility, located in the Teesside chemical area in northeastern England, is geographically split among three primary locations: the main site, which contains an ammonia plant, three nitric acid plants and a carbon dioxide plant; the Portrack site, approximately two miles away, which contains an AN fertilizer plant; and the common units representingNorth Tees site, approximately seven miles away, which contains an ammonia storage area. These locations collectively have on-site storage for 40,000 tons of ammonia and 128,000 tons of AN.
Point Lisas, Trinidad
The Point Lisas Nitrogen facility in the Republic of Trinidad and Tobago is owned jointly through a 50/50 venture with Koch Fertilizer LLC. This facility has the capacity to produce 720,000 tons of ammonia annually from natural gas supplied under a contract with The National Gas Company of Trinidad and Tobago Limited (NGC).
Nitrogen Fertilizer Raw Materials
Natural gas is the principal raw material and primary fuel source used in the ammonia production process at our nitrogen manufacturing facilities. In 2020, natural gas accounted for approximately one-third of our total production costs for nitrogen products. Our nitrogen manufacturing facilities have access to abundant, competitively-priced natural gas through a reliable network of pipelines that are connected to major natural gas trading hubs near the facilities. Our facilities utilize the following natural gas hubs: Henry Hub in Louisiana; SONAT in Louisiana; TETCO ELA in Louisiana; ONEOK in Oklahoma; AECO in Alberta; Ventura in Iowa; Demarcation in Kansas; Welcome in Minnesota; Dawn in Ontario; Parkway in Ontario; and the National Balancing Point (NBP) in the United Kingdom.
In 2020, our nitrogen manufacturing facilities consumed, in the aggregate, approximately 365 million MMBtus of natural gas. We employ a combination of daily spot and term purchases from a variety of quality suppliers to maintain a reliable, competitively-priced supply of natural gas. We also use certain financial instruments to hedge natural gas prices. See Note 15—Derivative Financial Instruments for additional information about our natural gas hedging activities.
Nitrogen Fertilizer Distribution
The safe, efficient and economical distribution of nitrogen products is critical for successful operations. Our nitrogen production facilities have access to multiple transportation modes by which we ship products to terminals, warehouses and customers. Each of our production facilities has a unique distribution pattern based on its production capacity and location.
Our North American nitrogen production facilities can ship products via truck and rail to customers and to our storage facilities in the U.S. and Canada, with access to our leased railcar fleet of approximately 5,000 tank and hopper cars, as well as railcars provided by rail carriers. Our United Kingdom nitrogen production facilities mainly ship products via truck.
The North American waterway system is also used extensively to ship products from our Donaldsonville, Verdigris and Yazoo City facilities. To ship ammonia and UAN, we employ a fleet of ten tow boats and twenty-eight river barges, which are primarily leased. We also utilize contract marine services to move urea fertilizer. We can also export nitrogen fertilizer products via seagoing vessels from our Donaldsonville, Yazoo City, Billingham and Ince manufacturing facilities.
The Donaldsonville facility is connected to the 2,000-mile long Nustar pipeline through which we have the ability to transport ammonia to ten terminals and shipping points in the Midwestern U.S. corn belt.
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Storage Facilities and Other Properties
As of December 31, 2020, we owned or leased space at 63 in-market storage terminals and warehouses located in a 21-state region of the United States, Canada and the United Kingdom. Including storage at our production facilities, we have an aggregate storage capacity for approximately 3.2 million tons of product. Our storage capabilities are summarized in the following table:
 AmmoniaGranular Urea
UAN(1)
AN
 Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Number of
Facilities
Capacity
(000 Tons)
Plants546 320 549 234 
Terminal and Warehouse Locations
Owned22 780 — — 244 — — 
Leased(2)
124 32 24 391 — — 
Total In-Market28 904 32 33 635 — — 
Total Storage Capacity1,450 352 1,184 234 

(1)Capacity is expressed as the equivalent volume of UAN measured on a 32% nitrogen content basis.
(2)Our lease agreements are typically for periods of one to five years.
Customers
The principal customers for our nitrogen products are cooperatives, independent fertilizer distributors, traders, wholesalers and industrial users. Sales are generated by our internal marketing and sales force. CHS was our largest customer in 2020 and accounted for approximately 13% of our consolidated net sales. We have a strategic venture with CHS under which CHS has a minority equity interest in CFN. See Note 17—Noncontrolling Interests for additional information on our strategic venture with CHS.
Competition
Our markets are global and intensely competitive, based primarily on delivered price and, to a lesser extent, on customer service and product quality. During the peak demand periods, product availability and delivery time also play a role in the buying decisions of customers.
Our primary North American-based competitors include Nutrien Ltd., Koch Fertilizer LLC and Iowa Fertilizer Company. There is also significant competition from products sourced from other regions of the world, including some with lower natural gas or other feedstock costs. Because ammonia, urea and UAN are widely-traded fertilizer products and there are limited partner interestsbarriers to entry, we experience competition from foreign-sourced products continuously.
Our primary United Kingdom competition comes from imported products supplied by companies including Yara International, Origin Fertilisers, Ameropa, CHS and Helm. Urea and UAN are not produced in the United Kingdom, but along with AN are widely-traded fertilizer products with limited barriers to entry.
Seasonality
The fertilizer business is seasonal. The degree of seasonality of our business can change significantly from year to year due to weather conditions in the agricultural industry and other factors. The strongest demand for our products in North America occurs during the spring planting season, with a second period of strong demand following the fall harvest. In contrast, we and other fertilizer producers generally manufacture and distribute products throughout the year. As a result, we and/or our customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application season and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in our sales volumes and net sales being the highest during the spring and our working capital requirements being the highest just prior to the start of the spring planting season. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in planting schedules and purchasing patterns.
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Environmental, Health and Safety
We are subject to numerous environmental, health and safety laws and regulations in the United States, Canada, the United Kingdom, the European Union and the Republic of Trinidad and Tobago, including laws and regulations relating to the generation and handling of hazardous substances and wastes; the cleanup of hazardous substance releases; the discharge of regulated substances to air or water; and the demolition of existing plant sites upon permanent closure. In the United States, these laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act (RCRA), the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), the Toxic Substances Control Act (TSCA), the Occupational Safety and Health Act (OSHA) and various other federal, state and local statutes. Violations of environmental, health and safety laws can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. In addition, environmental, health and safety laws and regulations may impose joint and several liability, without regard to fault, for cleanup costs on potentially responsible parties who have released or disposed of hazardous substances into the environment. We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future.
Environmental, Health and Safety Expenditures
Our environmental, health and safety capital expenditures in 2020 totaled approximately $40 million. We estimate that we will ceasehave approximately $45 million of capital expenditures for environmental, health and safety in 2021. In addition, to support safe and reliable operations at our continuous process manufacturing facilities, we conduct scheduled inspections, replacements and overhauls of our plant machinery and equipment, which are referred to as turnarounds. A further description of turnaround activities is included in Note 6—Property, Plant and Equipment—Net to our consolidated financial statements included in Item 8 of this report. Environmental, health and safety laws and regulations are complex, change frequently and have tended to become more stringent over time. We expect that continued government and public emphasis on environmental issues will result in increased future expenditures for environmental controls at our manufacturing and distribution facilities. Such expenditures could have a material adverse effect on our business, financial condition, results of operations and cash flows. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial expenditures. Our costs to comply with, or any liabilities under, these laws and regulations could have a material adverse effect on our business, financial condition, results of operations and cash flows.
CERCLA/Remediation Matters
From time to time, we receive notices from governmental agencies or third parties alleging that we are a potentially responsible party at certain cleanup sites under CERCLA or other environmental cleanup laws. In 2011, we received a notice from the Idaho Department of Environmental Quality (IDEQ) that alleged that we were a potentially responsible party for the cleanup of a former phosphate mine site we owned in the late 1950s and early 1960s located in Georgetown Canyon, Idaho. The current owner of the property and a former mining contractor received similar notices for the site. Based on a Consent Order entered into with IDEQ and the U.S. Forest Service in 2014, we and the current property owner are currently conducting a remedial investigation and feasibility study of the site. In 2015, we and several other parties received a notice that the U.S. Department of the Interior and other trustees intend to undertake a natural resource damage assessment for 17 former phosphate mines in southeast Idaho, one of which is the former Georgetown Canyon mine. See Note 20—Contingencies for additional information.
Regulation of Greenhouse Gases
We are subject to regulations in the United Kingdom, the European Union, Canada and the United States concerning greenhouse gas (GHG) emissions.
The United Kingdom has adopted GHG emissions regulations, including regulations to implement the European Union Greenhouse Gas Emission Trading System (EU ETS). Our U.K. manufacturing plants are required to report GHG emissions annually to the United Kingdom Environment Agency pursuant to their site Environmental Permits and Climate Change Agreement, which specify energy efficiency targets. Failure to meet efficiency targets may require these plants to purchase CO2 emissions allowances. The steam boilers at each of our U.K. sites have also been subject to the EU ETS, and have been required to hold or obtain emissions allowances to offset GHG emissions. Notwithstanding the exit of the United Kingdom from the European Union (Brexit) on January 31, 2020, facilities in the United Kingdom remained subject to the EU ETS through the end of 2020. Beginning on January 1, 2021, our U.K. manufacturing plants became subject to the UK Emissions Trading Scheme (UK ETS). At least initially, the UK ETS is expected to be similar to the EU ETS, although the U.K. government has stated that it intends to establish an emissions cap that is lower than what it would have been had the United Kingdom remained subject to the EU ETS. No agreement has been reached as to whether the UK ETS will establish a linkage with the EU ETS or other national emission trading systems.
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In Canada, we are required to conduct an annual review of our operations with respect to compliance with Environment Canada’s National Pollutant Release Inventory and Ontario’s Mandatory Monitoring and Reporting Regulation and the GHG Reporting Regulation. In 2018, the federal Greenhouse Pollution Pricing Act came into effect, pursuant to which Environment and Climate Change Canada (ECCC) will implement the Output-Based Performance Standard (OBPS), which is intended to function as a backstop to provincial greenhouse gas emissions regulations. In June 2019, the ECCC finalized the emission limits for carbon dioxide equivalent (CO2e) emissions from nitrogen fertilizer products. These emission limits are based on 95% of the average emissions intensity for the production of such products from all Canadian nitrogen fertilizer plants, reflecting that such products are deemed to be energy-intensive and trade-exposed and thus subject to a less stringent emissions reduction requirement. In the provinces and territories where the OBPS applies, a facility whose carbon emissions exceed the applicable limits is required to offset emissions by obtaining and retiring surplus emission credits, obtaining qualifying emissions offsets, or paying a fee, which for calendar year 2019 was CAD $20 per ton of excess carbon dioxide equivalent, and which fee increases by CAD $10 per ton for each succeeding year through 2022. In December 2020, the Canadian federal government announced that it intended to increase the price of excess emissions of CO2e by CAD $15 per ton for each year beginning in 2023, with the price of excess CO2e emissions reaching CAD $170 per ton by 2030. Ontario, Saskatchewan and Alberta are challenging whether the federal government has jurisdiction to impose a federal carbon price on the provinces and territories. The Saskatchewan Court of Appeal (in May 2019) and the Ontario Court of Appeal (in June 2019) each held that the Greenhouse Pollution Pricing Act (GPPA) was validly enacted under the Canadian constitution, while the Alberta Court of Appeal ruled in February 2020 that the GPPA was unconstitutional. Oral argument on the appeal of these decisions was heard by the Supreme Court of Canada in September 2020.
In January 2017, Ontario launched its own GHG cap and trade program and beginning January 1, 2018, Ontario’s cap and trade program was linked with the cap and trade programs in Quebec and California. Our Courtright Nitrogen Complex was subject to the Ontario cap and trade program. However, the Ontario government rescinded the cap and trade program in June 2018. Because Ontario no longer had a GHG regulatory regime, the federal government imposed the OBPS in the province beginning in 2019. In July 2019, the new Ontario government enacted a new GHG regulation, called the Emissions-Performance Standards program (EPS), that sets CO2e emissions limits for nitrogen products based on a production weighted sectoral average. For facilities whose carbon emissions exceed the applicable limits, compliance options included the purchase of emissions performance units for a fee of CAD $20 per ton of excess CO2e for calendar year 2019, which fee rises by CAD $10 per ton each year through 2022. Except for registration and recordkeeping provisions, the EPS has not yet gone into effect in Ontario and facilities in Ontario are subject to the federal OBPS. However, in September 2020, ECCC announced that the Ontario EPS met the federal government’s minimum stringency benchmark requirements, and the federal carbon pricing system will no longer apply in Ontario at a date to be set in consultation between ECCC and the Ontario government.
Beginning in 2018, our Medicine Hat Nitrogen Complex became subject to the Carbon Competitiveness Incentive Regulation (CCIR). This regulation establishes product-specific benchmarks based on the most efficient GHG-emitting facilities in a sector. A facility with emissions that exceeded the applicable benchmark was required to take action to reduce its GHG emissions intensity, purchase emissions offsets or performance credits, or make contributions to Alberta’s climate fund. In 2019, the Alberta government passed the Technology Innovation and Emission Reduction Implementation Act (TIER), which replaced the CCIR and went into effect on January 1, 2020. The TIER requires large emitting facilities (other than electricity producers, which are subject to a different standard) to comply with the least stringent of a “facility-specific” benchmark of 90% of historical GHG emissions intensity from a three-year baseline, which intensity limit will be reduced by 1% a year beginning in 2021, or a benchmark reflecting the emissions intensity of the top 10% of facilities for a given sector. The compliance options under the TIER are similar to the compliance options under the CCIR, including initially establishing the price for payments into its carbon fund at CAD $30 per excess ton of emissions (the same effective price as set in the CCIR). The federal government had determined that Alberta’s CCIR meets its stringency requirements and did not impose the OBPS in 2019. In December 2019, the federal government determined that the TIER also met the stringency requirements of the OBPS with respect to its regulation of large industrial emitters for 2020. The Alberta government has announced that it will increase the levy for excess emissions of CO2e from CAD $30 per ton in 2020 by CAD $10 per year, up to CAD $50 per ton in 2022, to match the price of carbon established in the OBPS.
In the United States, GHG regulation is evolving at state, regional and federal levels, although some of the more significant developments to date, including EPA’s efforts to regulate greenhouse gas emissions from fossil fuel-fired power plants, do not directly impose obligations on our facilities. The EPA issued a mandatory GHG reporting rule that required all of our U.S. manufacturing facilities to commence monitoring GHG emissions beginning on January 1, 2010 and reporting the previous year’s emissions annually starting in 2011. In addition, if we seek to modify or expand any of our major facilities and as a result, are required to obtain a Prevention of Significant Deterioration (PSD) construction permit applicable to such facilities, we could be subject to pollution control requirements applicable to GHGs in addition to requirements applicable to conventional air pollutants. Such requirements may result in increased costs or delays in completing such projects. Other than
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the states’ implementation of this permitting requirement, none of the states where our U.S. production facilities are located-Iowa, Louisiana, Mississippi and Oklahoma-has proposed control regulations limiting GHG emissions.
On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement was accepted by the United States and ratified by Canada and the United Kingdom and went into effect in November 2016. The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5°C above pre-industrial levels. Each signatory is required to develop its own national plan to attain this objective. Increasing concern over the impacts of climate change is driving the signatories to establish even more ambitious GHG reduction targets. In December 2020, the United Kingdom announced a target to reduce GHG emission 68% from 1990 levels by 2030. The EU has announced a new target to reduce its GHG emission 55% below 1990 levels by 2030. On November 4, 2019, the United States submitted formal notice of its withdrawal from the Paris Agreement, which became effective on November 4, 2020, but on January 20, 2021, President Biden announced that the United States has rejoined the Paris Agreement. This will require the United States to submit its own national plan for reducing GHG emissions. Executive Orders issued by the Biden Administration, including in particular an executive order issued on January 27, 2021 focusing on climate change, evidence the Administration’s intent to undertake numerous initiatives in an effort to reduce GHG emissions, including promoting renewable energy development, limiting or prohibiting new oil and gas leases on federal lands, and in general, making climate change considerations a critical component of federal policy.
New Source Performance Standards for Nitric Acid Plants
We operate 14 nitric acid plants in the United States. On August 14, 2012, the EPA issued a final regulation revising air emission standards applicable to newly constructed, reconstructed or modified nitric acid plants. The regulations will apply to these plants if and when we undertake activities or operations that are considered modifications, including physical changes that would allow us to increase our production capacity at these plants. The regulations include certain provisions that could make it difficult for us to meet the limits on emissions of nitrogen oxides (NOx) notwithstanding pollution controls we may add to our plants, and accordingly, the regulations could impact our ability to expand production at our existing plants. The EPA regulation did not include a limitation on emissions of nitrous oxide (a greenhouse gas).
Regulatory Permits and Approvals
We hold numerous environmental and other governmental permits and approvals authorizing operations at each of our facilities. A decision by a government agency to deny or delay issuing a new or renewed regulatory material permit or approval, or to revoke or substantially modify an existing material permit or approval, could have a material adverse effect on our ability to continue operations at the affected facility. Any future expansion of our existing operations is also predicated upon securing the necessary environmental or other permits or approvals. More stringent environmental standards may impact our ability to obtain such permits.
Human Capital Resources
Our long-term success depends on our people. We are dedicated to creating a workplace where employees are proud to work and grow and everyone feels empowered to do their best work. We do this by investing in extensive recruitment, training and professional development opportunities for our employees and fostering diversity and inclusion in our culture.
Employee Population. We employed approximately 3,000 employees at December 31, 2020, of which 66% were located in the United States, 20% in the United Kingdom, and 14% in Canada. As of December 31, 2020, 16% of our employees have worked for the Company more than 20 years, 16% of our employees have worked for the Company between 11 and 20 years, 27% of our employees have worked for the Company between 6 and 10 years, and 41% of our employees have worked at the Company for less than 6 years. Full-time employees represented approximately 99% of our workforce as of December 31, 2020 and approximately 15% were covered by a collective bargaining agreement. We supplement our workforce with contractors with specialized skill sets during periods of peak activity, such as during turnarounds and maintenance events.
Culture, Inclusion and Diversity. Our core values and their underlying principles reflect our commitment to a diverse and inclusive culture, treating one another with respect. During 2020, all of our employees engaged in training to learn to recognize and address the effects of unconscious bias by challenging assumptions; encouraging diversity of experience, opinion, and expression; and supporting a workplace culture that actively strives to be more inclusive. As of December 31, 2020, approximately 14% of our global workforce was female and 15% of the Company’s employees in managerial roles were female. Minorities represented approximately 14% of the Company’s U.S. workforce and 12% of our U.S. employees in managerial roles. In order to continue to improve the inclusiveness and diversity of our company and culture, our recently
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announced comprehensive ESG goals include goals to increase the representation of females and persons of color in senior leadership roles and to implement a program designed to increase the hiring and promotion of minority and female candidates.
Workforce Health and Safety. Operating in a safe and responsible manner is a core value and an integral part of what sets the Company apart. We believe that focusing on leading indicators - such as the behavioral safety practices we have incorporated into our annual incentive plan - to drive and measure activities that prevent and control safety incidents, results in our industry-leading safety record. As of December 31, 2020, our 12-month rolling average recordable incident rate (RIR) was 0.14 incidents per 200,000 work hours, and our total recordable injury count was four. For the year ended December 31, 2020, our days away, restricted or transferred (DART) incident rate was 0.03 injuries per 200,000 work hours, and our lost time incident rate was 0.00.
Response to COVID-19 Pandemic. During fiscal 2020, in response to the COVID-19 pandemic, we implemented safety precautions to protect the health and well-being of all of our employees, including the manufacturing workforce who operate our nitrogen manufacturing complexes and distribution facilities. See Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Overview of CF Holdings—Market Conditions and Current Developments—COVID-19 Pandemic, for a further discussion of the pandemic and the actions we have taken.
Talent Development. A core aspect of our culture is our commitment to identifying and developing talent to help employees accelerate growth and achieve their career goals. We invest in extensive assessment, training and professional development opportunities for our employees through a robust set of formal and informal programs, including targeted job movements, key experiences, and training, with an emphasis on creating a culture of inclusion. Leadership is the quality that drives our values and sets us apart. To help foster leadership, we have developed a set of leadership competencies that provide a common language for how to demonstrate leadership at every level of the organization. We view training and development programs as being a key part of succession planning, allowing us to grow a stronger company today and in the future.
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ITEM 1A.    RISK FACTORS.
In addition to the other information contained in this Annual Report on Form 10-K, you should carefully consider the factors discussed below before deciding to invest in any of our securities. These risks and uncertainties, individually or in combination, could materially and adversely affect our business, financial condition, results of operations and cash flows.
Market Risks
Our business is cyclical, resulting in periods of industry oversupply during which our business, financial condition, results of operations and cash flows tend to be negatively affected.
Historically, selling prices for our products have fluctuated in response to periodic changes in supply and demand conditions. Demand for nitrogen is affected by planted acreage, crop selection and fertilizer application rates, driven by population growth, gross domestic product growth, changes in dietary habits and non-food use of crops, such as production of ethanol and other biofuels among other things. Demand also includes industrial uses of nitrogen, for example chemical manufacturing and emissions reductants such as diesel exhaust fluid (DEF). Supply is affected by available capacity and operating rates, raw material costs and availability, energy prices, government policies and global trade.
Periods of strong demand, high capacity utilization and increasing operating margins tend to stimulate global investment in production capacity. In recent years, fertilizer producers, including CF Holdings, have built new production facilities or expanded capacity of existing production assets, or announced plans to do so. The construction of new nitrogen fertilizer manufacturing capacity in the industry, plus improvements to increase output from the existing production assets, increase nitrogen supply availability and affect the balance of supply and demand. In certain years, global nitrogen fertilizer capacity has increased faster than global nitrogen fertilizer demand, creating a surplus of global nitrogen fertilizer capacity, which led to lower nitrogen fertilizer selling prices in 2016 and 2017. For example, in the two-year period ended December 31, 2017, additional production capacity came on line and, at the same time, the average selling price for our products declined 34%, from $314 per ton in 2015 to $207 per ton in 2017.
Additional production capacity is expected to come on line over the next 12 months outside of North America. We cannot predict the impact of this additional capacity. Also, global or local economic and financial conditions or changes in such conditions, or other factors may cause acceleration of other announced and/or ongoing projects.
Price fluctuations for our products result from changes in supply and demand. Significant price fluctuations we experience could be symptoms of an oversupplied market in transition as new capacity ramps up, and production slows down or shuts down in high cost regions. Similarly, lower energy prices can spur increases in production in high cost regions, which would result in increased supply and pressure on selling prices. Additionally, trade flows adjust as imports into different regions of the world also impact the local supply and demand balances. If imports increase into an oversupplied region, lower prices in that region could result.
During periods of industry oversupply, our financial condition, results of operations and cash flows tend to be affected negatively as the price at which we sell our products typically declines, resulting in possible reduced profit margins, write-downs in the value of our inventory and temporary or permanent curtailments of production. In 2016 and 2017, our financial performance, credit ratings and the trading price for our common stock were negatively impacted by the lower selling prices resulting from the global oversupply of nitrogen fertilizer; while in 2018 and 2019, we experienced increases in the average selling price for our products. In 2020, the average selling price for our products decreased 14% to $203 per ton compared to $235 per ton in 2019. The period of time that these oversupply conditions can persist and the degree to which they will impact our business, financial condition, results of operations and cash flows are uncertain.
Our nitrogen products are global commodities, and we face intense global competition from other producers.
We are subject to intense price competition from our competitors. Most fertilizers and related nitrogen products that we produce, such as industrial grade ammonium nitrate and DEF, are global commodities, with little or no product differentiation, and customers make their purchasing decisions principally on the basis of delivered price and, to a lesser extent, customer service and product quality. As a consequence, conditions in the international market for nitrogen products significantly influence our operating results.
We compete with many producers, including state-owned and government-subsidized entities. Some of our competitors have greater total resources and are less dependent on earnings from fertilizer sales, which make them less vulnerable to industry downturns and better positioned to pursue new expansion and development opportunities. Furthermore, certain governments, in some cases as owners of some of our competitors, may be willing to accept lower prices and profitability on their products or subsidize production or consumption in order to support domestic employment or other political or social
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goals. Our competitive position could suffer to the extent we are not able to expand our own resources, either through investments in new or existing operations or through acquisitions, joint ventures or partnerships.
China, the world’s largest producer and consumer of nitrogen fertilizers, currently has significant capacity surplus and many high-cost plants. As a result, the domestic nitrogen industry in China is operating at less than full capacity. If Chinese government policy, devaluation of the Chinese renminbi, the relaxation of Chinese environmental standards or decreases in Chinese producers’ underlying costs such as the price of Chinese coal encourage increased production capacity utilization, any resulting export volume could adversely affect the balance between global supply and demand and may put downward pressure on global fertilizer prices, which could materially adversely affect our business, financial condition, results of operations and cash flows.    
Our competitors in Russia continue to benefit from non-market pricing of natural gas, allowing continued exports from the region, and have significant nitrogen fertilizer export capacity. The 2016 revocations of U.S. antidumping measures on solid urea and fertilizer grade ammonium nitrate from Russia have allowed for increases in imports from that country into the United States in recent years.
We also face competition from other fertilizer producers in the Middle East, Europe, Latin America and Africa, who, depending on market conditions, fluctuating input prices, geographic location and freight economics, may take actions at times with respect to price or selling volumes that adversely affect our business, financial condition, results of operations and cash flows.
In addition, the international market for nitrogen products is influenced by such factors as currency exchange rates, including the relative value of the U.S. dollar and its impact upon the cost of importing of nitrogen products into the United States, foreign agricultural policies, the existence of, or changes in, import or foreign currency exchange barriers in certain foreign markets and the laws and policies of the markets in which we operate, including the imposition of new duties, tariffs or quotas, that affect foreign trade and investment. For example, the imposition of duties, tariffs or quotas in a region can directly impact product pricing in that region, which can lead to changes in global trade flows and impact the global supply and demand balance and pricing. Market participants customarily move product between regions of the world, or adjust trade flows, in response to these factors. North America, where we manufacture and sell most of our products, is one of the largest and most liquid nitrogen trading regions in the world. As a result, other manufacturers, traders and other market participants can move nitrogen products to North America when there is uncertainty associated with the supply and demand balance in other regions or when duties, tariffs or quotas impact prices or trade flows in other regions. As a result, duties, tariffs and quotas can lead to uncertainty in the global marketplace and impact the supply and demand balance in many regions, which could adversely affect our business, financial condition, results of operations and cash flows. On October 9, 2019, the European Commission (the Commission) imposed definitive anti-dumping duties on imports to the European Union of UAN manufactured in Russia, the Republic of Trinidad and Tobago and the United States. For imports of UAN manufactured in the United States, the fixed duty rate is €29.48 per metric ton (or €26.74 per ton). The duties will remain in place for an initial five-year period, after which the measures may be renewed by the Commission. The long term impact of this duty on the international market for nitrogen products is uncertain.
A decline in agricultural production or limitations on the use of our products for agricultural purposes could materially adversely affect the demand for our products.
Conditions in the United States, Europe, India, Brazil, China and other global agricultural areas significantly impact our operating results. Agricultural planted areas and production can be affected by a number of factors, including weather patterns and field conditions, current and projected grain inventories and prices, crop disease and/or livestock disease, demand for agricultural products and governmental policies regarding production of or trade in agricultural products. These factors are outside of our control.
Governmental policies, including farm and biofuel subsidies, commodity support programs and tariffs, as well as the prices of fertilizer products, may also directly or indirectly influence the number of acres planted, the mix of crops planted and the use of fertilizers for particular agricultural applications. Ethanol production in the United States contributes significantly to corn demand, representing approximately 35% of total U.S. corn demand, due in part to federal legislation mandating use of renewable fuels. An increase in ethanol production has led to an increase in the amount of corn grown in the United States and to increased fertilizer usage on both corn and other crops that have also benefited from improved farm economics. While the current Renewable Fuel Standard encourages continued high levels of corn-based ethanol production, various interested parties have called to eliminate or reduce the renewable fuel mandate, or to eliminate or reduce corn-based ethanol as part of the renewable fuel mandate. Other factors that drive the ethanol market include the prices of ethanol, gasoline and corn. Lower gasoline prices and fewer aggregate miles, driven by increased automobile fuel efficiency or the continued expansion of electric
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vehicles, may put pressure on ethanol prices that could result in reduced profitability and lower production for the ethanol industry. This could have an adverse effect on corn-based ethanol production, planted corn acreage and fertilizer demand.
Developments in crop technology, such as nitrogen fixation, the conversion of atmospheric nitrogen into compounds that plants can assimilate, or nitrogen-efficient varieties, or developments in alternatives to traditional animal feed or alternative proteins, could also reduce the use of chemical fertilizers and adversely affect the demand for our products. Widespread adoption of emerging application technologies or alternative farming techniques could disrupt traditional application practices, affecting the volume or types of products used and timing of applications. In addition, from time to time various foreign government and U.S. state legislatures have considered limitations on the use and application of chemical fertilizers due to concerns about the impact of these products on the environment. For example, the United Kingdom is currently consulting with stakeholders and reviewing proposals to limit emissions from solid urea fertilizers, including a potential ban on urea fertilizers. While CF Fertilisers UK Limited does not sell solid urea fertilizer in the United Kingdom, other jurisdictions may consider limits on fertilizer use, such as the European Union, which announced its Farm to Fork and Biodiversity Strategies. Any reduction in the demand for chemical fertilizer products, including as a result of technological developments and/or limitations on the use and application of chemical fertilizers, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Our business is dependent on natural gas, the prices of which are subject to volatility.
Nitrogen from the atmosphere and hydrogen from natural gas, coal and other carbon energy feedstocks, or from the electrolysis of water, are the fundamental building blocks of nitrogen fertilizers. Energy feedstock costs comprise a significant portion of the total production cost of nitrogen products and, relative to the industry’s marginal producers that set the global price of nitrogen, generally determine profitability for nitrogen producers. Our manufacturing processes utilize natural gas as the principal raw material used in our production of nitrogen fertilizers. We use natural gas both as a chemical feedstock and as a fuel to produce ammonia, granular urea, urea ammonium nitrate solution (UAN), ammonium nitrate (AN) and other nitrogen products.
Most of our nitrogen fertilizer manufacturing facilities are located in the United States and Canada. As a result, North American natural gas comprises a significant portion of the total production cost of our products. In recent years, the cost of North American natural gas for the production of nitrogen fertilizers has been significantly lower than the energy costs of the industry’s marginal nitrogen producers. Changes in the supply of and demand for natural gas can lead to extended periods of higher natural gas prices. If high natural gas prices were to persist in North America and significantly erode our favorable energy cost differentials relative to the marginal nitrogen producers, it could have a material adverse effect on our business, financial condition, results of operations and cash flows.
The price of natural gas in North America has been volatile in recent years. During 2020, the daily closing price at the Henry Hub, the most heavily-traded natural gas pricing point in North America, reached a low of $1.34 per MMBtu on September 22, 2020 and three consecutive days in October and a high of $3.08 per MMBtu on October 27, 2020. During the three-year period ended December 31, 2020, the daily closing price at the Henry Hub reached a low of $1.34 per MMBtu on September 22, 2020 and three consecutive days in October 2020 and a high of $6.88 per MMBtu on January 4, 2018.
We also have manufacturing facilities located in the United Kingdom. These facilities are subject to fluctuations associated with the price of natural gas in Europe, which has also been volatile in recent years. The major natural gas trading point for the United Kingdom is the National Balancing Point (NBP). During 2020, the daily closing price at NBP reached a low of $1.04 per MMBtu on May 22, 2020 and a high of $7.71 per MMBtu on December 30, 2020. During the three-year period ended December 31, 2020, the daily closing price at NBP reached a low of $1.04 per MMBtu on May 22, 2020 and a high of $31.74 per MMBtu on March 2, 2018.
The price of natural gas in North America and worldwide has been volatile in recent years and has declined on average due in part to the development of significant natural gas reserves, including shale gas, and the rapid improvement in shale gas extraction techniques, such as hydraulic fracturing and horizontal drilling. Future production of natural gas from shale formations could be reduced by regulatory changes that restrict drilling or hydraulic fracturing or increase its cost or by reduction in oil exploration and development prompted by lower oil prices resulting in production of less associated gas.
Certain of our operating facilities are located near natural gas hubs that have experienced increased natural gas development and have favorable basis differences as compared to other North American hubs. Favorable basis differences in certain regions may dissipate over time due to increases in natural gas pipeline or storage capacity in those regions. Additionally, basis differentials may become materially unfavorable due to a lack of inbound gas pipeline or storage capacity in other regions during periods of unusually high demand. Increased demand for natural gas, particularly in the Gulf Coast Region, due to increased industrial demand and increased natural gas exports, could result in increased natural gas prices. If such reduced production, increased demand or changes in basis were to occur, or if other developments adversely impact the
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supply and demand balance for natural gas in North America or elsewhere, natural gas prices could rise, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Adverse weather conditions may decrease demand for our fertilizer products, increase the cost of natural gas or materially disrupt our operations.
Weather conditions that delay or disrupt field work during the planting, growing, harvesting or application periods may cause agricultural customers to use different forms of nitrogen fertilizer, which may adversely affect demand for the forms that we sell or may impede farmers from applying our fertilizers until the following application period, resulting in lower seasonal demand for our products.
Adverse weather conditions during or following harvest may delay or eliminate opportunities to apply fertilizer in the fall. Weather can also have an adverse effect on crop yields, which could lower the income of growers and impair their ability to purchase fertilizer from our customers. Adverse weather conditions could also impact transportation of fertilizer, which could disrupt our ability to deliver our products to customers on a timely basis. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in fertilizer applications, planting schedules and purchasing patterns. Over the longer-term, changes in weather patterns may shift the periods of demand for products and even the regions to which our products are distributed, which could require us to evolve our distribution system.
In addition, we use the North American waterway system extensively to ship products from some of our manufacturing facilities to our distribution facilities and our customers, and we also export nitrogen fertilizer products via seagoing vessels from deep-water docking facilities at certain of our manufacturing sites. Therefore, persistent significant changes in river or ocean water levels (either up or down, such as a result of flooding or drought for example), may require changes to our operating and distribution activities and/or significant capital improvements to our facilities.
Weather conditions or, in certain cases, weather forecasts, also can disrupt our operations and can affect the price of natural gas, the principal raw material used to make our nitrogen fertilizer products. Colder and/or longer than normal winters and warmer than normal summers increase the demand for natural gas for power generation and for residential and industrial use, which can increase the cost and/or decrease the availability of natural gas. In addition, adverse weather events can not only cause loss of power at our facilities disrupting our operations, but also can impact the supply of natural gas and utilities and cause prices to rise.
Our operating results fluctuate due to seasonality. Our inability to predict future seasonal fertilizer demand accurately could result in our having excess inventory, potentially at costs in excess of market value.
The fertilizer business is seasonal. The degree of seasonality of our business can change significantly from year to year due to conditions in the agricultural industry and other factors. The strongest demand for our products in North America occurs during the spring planting season, with a second period of strong demand following the fall harvest. In contrast, we and other fertilizer producers generally manufacture and distribute products throughout the year. As a result, we and/or our customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application seasons and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in our sales volumes and net sales being the highest during the spring and our working capital requirements being the highest just prior to the start of the spring planting season.
If seasonal demand is less than we expect, we may be left with excess inventory that will have to be stored (in which case our results of operations would be negatively affected by any related increased storage costs) or liquidated (in which case the selling price could be below our production, procurement and storage costs). The risks associated with excess inventory and product shortages are exacerbated by the volatility of nitrogen fertilizer prices and the relatively brief periods during which farmers can apply nitrogen fertilizers. If prices for our products rapidly decrease, we may be subject to inventory write-downs, adversely affecting our operating results.
A change in the volume of products that our customers purchase on a forward basis, or the percentage of our sales volume that is sold to our customers on a forward basis, could increase our exposure to fluctuations in our profit margins and materially adversely affect our business, financial condition, results of operations and cash flows.
We offer our customers the opportunity to purchase products from us on a forward basis at prices and delivery dates we propose. Under our forward sales programs, customers generally make an initial cash down payment at the time of order and pay the remaining portion of the contract sales value in advance of the shipment date. Forward sales improve our liquidity by reducing our working capital needs due to the cash payments received from customers in advance of shipment of the product
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and allow us to improve our production scheduling and planning and the utilization of our manufacturing and distribution assets.
Any cash payments received in advance from customers in connection with forward sales are reflected on our consolidated balance sheets as a current liability until the related orders are shipped, which can take up to several months.
We believe the ability to purchase products on a forward basis is most appealing to our customers during periods of generally increasing prices for nitrogen fertilizers. Our customers may be less willing or even unwilling to purchase products on a forward basis during periods of generally decreasing or stable prices or during periods of relatively high fertilizer prices due to the expectation of lower prices in the future or limited capital resources. In periods of rising fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in lower profit margins than if we had not sold fertilizer on a forward basis. Conversely, in periods of declining fertilizer prices, selling our nitrogen fertilizers on a forward basis may result in higher profit margins than if we had not sold fertilizer on a forward basis. In addition, fixing the selling prices of our products, often months in advance of their ultimate delivery to customers, typically causes our reported selling prices and margins to differ from spot market prices and margins available at the time of shipment.
Operational Risks
Our operations are dependent upon raw materials provided by third parties, and any delay or interruption in the delivery of raw materials may adversely affect our business.
We use natural gas and other raw materials in the manufacture of nitrogen products. We purchase the natural gas and other raw materials from third party suppliers. Our natural gas is transported by pipeline to our facilities by third party transportation providers or through the use of facilities owned by third parties. Delays or interruptions in the delivery of natural gas or other raw materials may be caused by, among other things, severe weather or natural disasters, unscheduled downtime, labor difficulties, insolvency of our suppliers or their inability to meet existing contractual arrangements, deliberate sabotage and terrorist incidents, or mechanical failures. In addition, the transport of natural gas by pipeline is subject to additional risks, including delays or interruptions caused by capacity constraints, leaks or ruptures. Any delay or interruption in the delivery of natural gas or other raw materials, even for a limited period, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Our transportation and distribution activities rely on third party providers and are subject to environmental, safety and regulatory oversight. This exposes us to risks and uncertainties beyond our control that may adversely affect our operations and exposes us to additional liability.
We rely on natural gas pipelines to transport raw materials to our manufacturing facilities. In addition, we rely on railroad, barge, truck, vessel and pipeline companies to coordinate and deliver finished products to our distribution system and to ship finished products to our customers. We also lease rail cars in order to ship raw materials and finished products. These transportation operations, equipment and services are subject to various hazards, including adverse operating conditions on the inland waterway system, extreme weather conditions, system failures, work stoppages, shutdowns, delays, accidents such as spills and derailments, vessel groundings and other accidents and operating hazards. Additionally, due to the aging infrastructure of certain rail lines, bridges, roadways, pipelines, river locks, and equipment that our third party service providers utilize, we may experience delays in both the receipt of raw materials or the shipment of finished product while repairs, maintenance or replacement activities are conducted. Also, certain third party service providers, such as railroads, have experienced periodic service delays or shutdowns due to capacity constraints in their systems, operational and maintenance difficulties, blockades, weather or safety-related embargoes and delays, and other events, which could impact the shipping of our products and cause disruption in our supply chain.
These transportation operations, equipment and services are also subject to environmental, safety, and regulatory oversight. Due to concerns related to accidents, discharges or other releases of hazardous substances, terrorism or the potential use of fertilizers as explosives, governmental entities could implement new or more stringent regulatory requirements affecting the transportation of raw materials or finished products.
If shipping of our products is delayed or we are unable to obtain raw materials as a result of these transportation companies’ failure to operate properly, or if new and more stringent regulatory requirements were implemented affecting transportation operations or equipment, or if there were significant increases in the cost of these services or equipment, our revenues and cost of operations could be adversely affected. In addition, increases in our transportation costs, or changes in such costs relative to transportation costs incurred by our competitors, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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In the United States and Canada, the railroad industry continues various efforts to limit the railroads’ potential liability stemming from the transportation of Toxic Inhalation Hazard materials, such as the anhydrous ammonia we transport to and from our manufacturing and distribution facilities. For example, various railroads shift liability to shippers by contract, purport to shift liability to shippers by tariff, or otherwise seek to require shippers to indemnify and defend the railroads from and against liabilities (including in negligence, strict liability, or statutory liability) that may arise from certain acts or omissions of the railroads, third parties who may have insufficient resources, or the Company, unknown causes or acts of god. These initiatives could materially and adversely affect our operating expenses and potentially our ability to transport anhydrous ammonia and increase our liability for releases of our anhydrous ammonia while in the care, custody and control of the railroads, third parties or us, for which our insurance may be insufficient or unavailable. New or more stringent regulatory requirements also could be implemented affecting the equipment used to ship our raw materials or finished products. Restrictions on service, increases in transportation costs, or changes in such costs relative to transportation costs incurred by our competitors, and any railroad industry initiatives that may impact our ability to transport our products, could have a material adverse effect on our business, financial condition, results of operations and cash flows.
We are subject to risks relating to our information technology systems, and any technology disruption or cybersecurity incident could negatively affect our operations.
We rely on internal and third-party information technology and computer control systems in many aspects of our business, including internal and external communications, the management of our accounting, financial and supply chain functions and plant operations. If we do not allocate and effectively manage the resources necessary to build and sustain the proper technology infrastructure, we could be subject to transaction errors, processing inefficiencies, the loss of customers, business disruptions, or the loss of or damage to our confidential business information due to a security breach. In addition, our information technology systems may be damaged, disrupted or shut down due to attacks by computer hackers, computer viruses, employee error or malfeasance, power outages, hardware failures, telecommunication or utility failures, catastrophes or other unforeseen events, and in any such circumstances our system redundancy and other disaster recovery planning may be ineffective or inadequate. Security breaches of our systems (or the systems of our customers, suppliers or other business partners) could result in the misappropriation, destruction or unauthorized disclosure of confidential information or personal data belonging to us or to our employees, business partners, customers or suppliers, and may subject us to legal liability.
As with most large systems, our information technology systems have in the past been, and in the future likely will be, subject to computer viruses, malicious codes, unauthorized access and other cyber attacks, and we expect the sophistication and frequency of such attacks to continue to increase. To date, we are not aware of any significant impact on our operations or financial results from such attempts; however, unauthorized access could disrupt our business operations, result in the loss of assets, and have a material adverse effect on our business, financial condition, or results of operations. Any of the attacks, breaches or other disruptions or damage described above could: interrupt our operations at one or more sites; delay production and shipments; result in the theft of our and our customers’ intellectual property and trade secrets; damage customer and business partner relationships and our reputation; result in legal claims and proceedings, liability and penalties under privacy or other laws, or increased costs for security and remediation; or raise concerns regarding our accounting for transactions. Each of these consequences could adversely affect our business, reputation and our financial statements.
Our business involves the use, storage, and transmission of information about our employees, customers, and suppliers. The protection of such information, as well as our proprietary information, is critical to us. The regulatory environment surrounding information security and privacy is increasingly demanding, with the frequent imposition of new and constantly changing requirements. We have established policies and procedures to help protect the security and privacy of this information. Breaches of our security measures or the accidental loss, inadvertent disclosure, or unapproved dissemination of proprietary information or sensitive or confidential data about us or our employees, customers or suppliers, including the potential loss or disclosure of such information or data as a result of fraud, trickery, or other forms of deception, could expose us or our employees, customers, suppliers or other individuals affected to a risk of loss or misuse of this information, which could ultimately result in litigation and potential legal and financial liability. These events could also damage our reputation or otherwise harm our business.
We are reliant on a limited number of key facilities.
Our nitrogen fertilizer operations are located at nine separate nitrogen complexes, the largest of which is the Donaldsonville complex, which represented approximately 40% of our ammonia production capacity as of December 31, 2020. The suspension of operations at any of these complexes could adversely affect our ability to produce our products and fulfill our commitments, and could have a material adverse effect on our business, financial condition, results of operations and cash flows. Operational disruptions could occur for many reasons, including natural disasters, weather, unplanned maintenance and other manufacturing problems, disease, strikes or other labor unrest or transportation interruptions. For example, our
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Donaldsonville complex is located in an area of the United States that experiences a relatively high level of hurricane or high wind activity and several of our complexes are located in areas that experience severe weather. Such storms, depending on their severity and location, have the potential not only to damage our facilities and disrupt our operations, but also to affect adversely the shipping and distribution of our products. Moreover, our facilities may be subject to failure of equipment that may be difficult to replace or have long delivery lead times, due in part to a limited number of suppliers, and could result in operational disruptions.
Acts of terrorism and regulations to combat terrorism could negatively affect our business.
Like other companies with major industrial facilities, we may be targets of terrorist activities. Many of our plants and facilities store significant quantities of ammonia and other materials that can be dangerous if mishandled. Any damage to infrastructure facilities, such as electric generation, transmission and distribution facilities, or injury to employees, who could be direct targets or indirect casualties of an act of terrorism, may affect our operations. Any disruption of our ability to produce or distribute our products could result in a significant decrease in revenues and significant additional costs to replace, repair or insure our assets, which could have a material adverse effect on our business, financial condition, results of operations and cash flows.
Due to concerns related to terrorism or the potential use of certain fertilizers as explosives, we are subject to various security laws and regulations. In the United States, these security laws include the Maritime Transportation Security Act of 2002 and the Chemical Facilities Anti-Terrorism Standards regulation. In addition, President Obama issued in 2013 Executive Order 13650 Improving Chemical Facility Safety and Security to improve chemical facility safety in coordination with owners and operators. Governmental entities could implement new or impose more stringent regulations affecting the security of our plants, terminals and warehouses or the transportation and use of fertilizers. These regulations could result in higher operating costs or limitations on the sale of our products and could result in significant unanticipated costs, lower revenues and reduced profit margins. We manufacture and sell certain nitrogen products that can be used as explosives. It is possible that governmental entities in the United States or elsewhere could impose additional limitations on the use, sale or distribution of nitrogen products, thereby limiting our ability to manufacture or sell those products, or that illicit use of our products could result in liability for us.
We are subject to risks associated with international operations.
Our international business operations are subject to numerous risks and uncertainties, including difficulties and costs associated with complying with a wide variety of complex laws, treaties and regulations; unexpected changes in regulatory environments; currency fluctuations; tax rates that may exceed those in the United States; earnings that may be subject to withholding requirements; and the imposition of tariffs, exchange controls or other restrictions.
Changes in governmental trade policies can lead to the imposition of new taxes, levies, duties, tariffs or quotas affecting agricultural commodities, fertilizer or industrial products. These can alter costs, trade flows, access to supplies or demand, and regional balances for our products.
Our principal reporting currency is the U.S. dollar and our business operations and investments outside the United States increase our risk related to fluctuations in foreign currency exchange rates. The main currencies to which we are exposed, besides the U.S. dollar, are the Canadian dollar, the British pound and the euro. These exposures may change over time as business practices evolve and economic conditions change. We may selectively reduce some foreign currency exchange rate risk by, among other things, requiring contracted purchases of our products to be settled in, or indexed to, the U.S. dollar or a currency freely convertible into U.S. dollars, or hedging through foreign currency derivatives. These efforts, however, may not be effective and could have a material adverse effect on our business, financial condition, results of operations and cash flows.
We are subject to anti-corruption laws and regulations and economic sanctions programs in various jurisdictions, including the U.S. Foreign Corrupt Practices Act of 1977, the United Kingdom Bribery Act of 2010, the Canadian Corruption of Foreign Public Officials Act, and economic sanctions programs administered by the United Nations, the European Union and the Office of Foreign Assets Control of the U.S. Department of the Treasury, and regulations set forth under the Comprehensive Iran Accountability Divestment Act. As a result of doing business internationally, we are exposed to a risk of violating anti-corruption laws and sanctions regulations applicable in those countries where we, our partners or agents operate. Violations of anti-corruption and sanctions laws and regulations are punishable by civil penalties, including fines, denial of export privileges, injunctions, asset seizures, debarment from government contracts (and termination of existing contracts) and revocations or restrictions of licenses, as well as criminal fines and imprisonment. The violation of applicable laws by our employees, consultants, agents or partners could subject us to penalties and could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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We are subject to antitrust and competition laws in various countries throughout the world. We cannot predict how these laws or their interpretation, administration and enforcement will change over time. Changes in antitrust laws globally, or in their interpretation, administration or enforcement, may limit our existing or future operations and growth.
Financial Risks
Our operations and the production and handling of our products involve significant risks and hazards. We are not fully insured against all potential hazards and risks incident to our business. Therefore, our insurance coverage may not adequately cover our losses.
Our operations are subject to hazards inherent in the manufacture, transportation, storage and distribution of chemical products, including ammonia, which is highly toxic and corrosive. These hazards include: explosions; fires; severe weather and natural disasters; train derailments, collisions, vessel groundings and other transportation and maritime incidents; leaks and ruptures involving storage tanks, pipelines and rail cars; spills, discharges and releases of toxic or hazardous substances or gases; deliberate sabotage and terrorist incidents; mechanical failures; unscheduled plant downtime; labor difficulties and other risks. Some of these hazards can cause bodily injury and loss of life, severe damage to or destruction of property and equipment and environmental damage, and may result in suspension of operations for an extended period of time and/or the imposition of civil or criminal penalties and liabilities.
We maintain property, business interruption, casualty and liability insurance policies, but we are not fully insured against all potential hazards and risks incident to our business. If we were to incur significant liability for which we were not fully insured, it could have a material adverse effect on our business, financial condition, results of operations and cash flows. We are subject to various self-insured retentions, deductibles and limits under these insurance policies. The policies also contain exclusions and conditions that could have a material adverse impact on our ability to receive indemnification thereunder. Our policies are generally renewed annually. As a result of market conditions, our premiums, self-insured retentions and deductibles for certain insurance policies can increase substantially and, in some instances, certain insurance may become unavailable or available only for reduced amounts of coverage. In addition, significantly increased costs could lead us to decide to reduce, or possibly eliminate, coverage. There can be no assurance that we will be able to buy and maintain insurance with adequate limits and reasonable pricing terms and conditions.
In April 2013, there was a fire and explosion at the West Fertilizer Co. fertilizer storage and distribution facility in West, Texas. According to published reports, 15 people were killed and approximately 200 people were injured in the incident, and the fire and explosion damaged or destroyed a number of homes and buildings around the facility. Various subsidiaries of CF Industries Holdings, Inc. (the CF Entities) were named as defendants along with other companies in lawsuits filed in 2013, 2014 and 2015 in the District Court of McLennan County, Texas by the City of West, individual residents of the County and other parties seeking recovery for damages allegedly sustained as a result of the explosion. The cases were consolidated for discovery and pretrial proceedings in the District Court of McLennan County under the caption “In re: West Explosion Cases.” The two-year statute of limitations expired on April 17, 2015. As of that date, over 400 plaintiffs had filed claims, including at least 9 entities, 325 individuals, and 80 insurance companies. Plaintiffs allege various theories of negligence, strict liability, and breach of warranty under Texas law. Although we do not own or operate the facility or directly sell our products to West Fertilizer Co., products that the CF Entities manufactured and sold to others were delivered to the facility and may have been stored at the West facility at the time of the incident. The Court granted in part and denied in part the CF Entities’ Motions for Summary Judgment in August 2015. Over three hundred cases have been resolved pursuant to confidential settlements that have been or we expect will be fully funded by insurance. The remaining cases are in various stages of discovery and pre-trial proceedings. The next group of cases is expected to be set for trial after the Court resumes scheduling civil jury trials currently on hold because of the outbreak of coronavirus disease 2019 (COVID-19) pandemic. We believe we have strong legal and factual defenses and intend to continue defending the CF Entities vigorously in the pending lawsuits. The increased focus on the risks associated with fertilizers as a result of the incident could impact the regulatory environment and requirements applicable to fertilizer manufacturing and storage facilities.
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Our substantial indebtedness could adversely affect our cash flow, prevent us from fulfilling our obligations and impair our ability to pursue or achieve other business objectives.
As of December 31, 2020, we had approximately $4.0 billion of total funded indebtedness, consisting primarily of secured and unsecured senior notes with varying maturity dates between 2021 and 2044, or approximately 40% of our total capitalization, and an additional $750 million of senior secured borrowing availability (reflecting no outstanding borrowings and no outstanding letters of credit) for general corporate purposes under our senior secured revolving credit agreement (as amended, the Revolving Credit Agreement). Our substantial debt service obligations will have an impact on our earnings and cash flow for so long as the indebtedness is outstanding.
Our substantial indebtedness could, as a result of our debt service obligations or through the operation of the financial and other restrictive covenants to which we are subject under the agreements and instruments governing that indebtedness and otherwise, have important consequences. For example, it could:
make it more difficult for us to pay or refinance our debts as they become due during adverse economic and industry conditions because any related decrease in revenues could cause us not to have sufficient cash flows from operations to make our scheduled debt payments;
cause us to be less able to take advantage of significant business opportunities, such as acquisition opportunities, and to react to changes in market or industry conditions;
cause us to use a portion of our cash flow from operations for debt service, reducing the availability of cash to fund working capital and capital expenditures, and other business activities;
cause us to be more vulnerable to general adverse economic and industry conditions;
expose us to the risk of increased interest rates because certain of our borrowings, including borrowings under our Revolving Credit Agreement, could be at variable rates of interest;
make us more leveraged than some of our competitors, which could place us at a competitive disadvantage;
restrict our ability to dispose of assets or otherwise restrict our use of funds from the disposal of assets;
restrict our ability to pay dividends on our common stock or utilize excess cash to repurchase shares of our common stock;
limit our ability to borrow additional monies in the future to fund working capital, capital expenditures and other general corporate purposes; and
result in a downgrade in the credit rating of our indebtedness which could increase the cost of further borrowings.
We expect to consider options to refinance our outstanding indebtedness from time to time. Our ability to obtain any financing, whether through the issuance of new debt securities or otherwise, and the terms of any such financing are dependent on, among other things, our financial condition, financial market conditions within our industry and generally, credit ratings and numerous other factors, including factors beyond our control. Consequently, in the event that we need to access the credit markets, including to refinance our debt, there can be no assurance that we will be able to obtain financing on acceptable terms or within an acceptable timeframe, if at all. An inability to obtain financing with acceptable terms when needed could have a material adverse effect on our business, financial condition, results of operations and cash flows.
The terms of our existing indebtedness allow us to incur significant additional debt in the future. If we incur additional indebtedness, the risks that we face as a result of our leverage could intensify. If our financial condition or operating results deteriorate, our relations with our creditors, including the holders of our outstanding debt securities, the lenders under our Revolving Credit Agreement and our suppliers, may be materially and adversely affected.
A failure to satisfy the financial maintenance covenants under our Revolving Credit Agreement or a breach of the covenants under any of the agreements governing our indebtedness could limit the borrowing availability under our Revolving Credit Agreement or result in an event of default under such agreements.
Our ability to comply with the covenants in the agreements and instruments governing our indebtedness, including the consolidated interest coverage ratio and consolidated net leverage ratio maintenance covenants contained in our Revolving Credit Agreement, will depend upon our future performance and various other factors, such as market prices for our nitrogen products, natural gas prices and other business, competitive and regulatory factors, many of which are beyond our control. We may not be able to maintain compliance with all of these covenants. In that event, we may not be able to access the borrowing availability under our Revolving Credit Agreement and we would need to seek an amendment to our debt agreements or would need to refinance our indebtedness. There can be no assurance that we can obtain future amendments or waivers of our debt agreements and instruments, or refinance our debt, and, even if we were able to do so, such relief might only last for a limited period, potentially necessitating additional amendments, waivers or refinancings. Any noncompliance by us with the covenants under our debt agreements and instruments could result in an event of default under those debt agreements and instruments. An event of default under an agreement or instrument governing any of our indebtedness may allow our creditors to accelerate the
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related debt and may result in the acceleration of any other debt to which a cross-acceleration or cross-default provision applies. If our lenders or holders of our debt securities accelerate the repayment of borrowings, we may be forced to liquidate certain assets to repay all or part of our indebtedness, which could materially and adversely impair our business operations. An event of default under our Revolving Credit Agreement would permit the lenders thereunder to terminate all commitments to extend further credit under our Revolving Credit Agreement. Furthermore, our Revolving Credit Agreement and senior secured notes provide for liens on specified collateral to secure our obligations thereunder, and if we were unable to repay amounts due and payable under our Revolving Credit Agreement or the senior secured notes, our Revolving Credit Agreement lenders or holders of the senior secured notes, as applicable, could proceed against the collateral granted to them, which could have a material adverse effect on our business, financial condition and results of operations. In the event our creditors accelerate the repayment of our indebtedness, we cannot assure that we would have sufficient assets to make such repayment.
Potential future downgrades of our credit ratings could adversely affect our access to capital, cause vendors to change their credit terms for doing business with us, and could otherwise have a material adverse effect on us.
As of February 16, 2021, our corporate credit rating by S&P Global Ratings is BB+ with a stable outlook; our corporate credit rating by Moody’s Investor Services, Inc. is Ba1 with a stable outlook; and our corporate credit rating with Fitch Ratings, Inc. is BB+ with a stable outlook.
These ratings and our current credit condition affect, among other things, our ability to access new capital, especially debt, as well as the payment terms that vendors are willing to provide us. Negative changes in these ratings may result in more stringent covenants and higher interest rates under the terms of any new debt, and could cause vendors to shorten our payment terms, require us to pay in advance for materials or services, or provide letters of credit, security, or other credit enhancements in order to do business with us.
Tax matters, including changes in tax laws or rates, adverse determinations by taxing authorities and imposition of new taxes could adversely affect our results of operations and financial condition.
We are subject to taxes in (i) the United States, where most of our operations are located, and (ii) numerous foreign jurisdictions where our subsidiaries are organized or conduct business. Tax rates in the various jurisdictions in which we operate may be subject to significant change. Our future effective tax rate could also be affected by changes in our mix of earnings from countries with differing statutory tax rates and tax systems, changes in valuation of deferred tax assets and liabilities or changes in tax laws or their interpretation.
We are also subject to regular reviews, examinations and audits by the Internal Revenue Service (IRS) and other taxing authorities in jurisdictions where we conduct business. Although we believe our tax estimates are reasonable, if a taxing authority disagrees with the positions we have taken, we could face additional tax liabilities, including interest and penalties. There can be no assurance that payment of such additional amounts upon final adjudication of any disputes will not have a material impact on our results of operations and financial condition.
We have used the cash we generate outside the United States primarily to fund development of our business in non-U.S. jurisdictions. If the funds generated by our U.S. business are not sufficient to meet our need for cash in the United States, we may need to repatriate a portion of our future international earnings to the United States. Under the tax laws of the foreign countries in which we operate, those international earnings could be subject to withholding taxes when repatriated; therefore, the repatriation of those earnings could result in an increase in our worldwide effective tax rate and an increase in our use of cash to pay these taxes.
We also need to comply with other new, evolving or revised tax laws and regulations. The enactment of, or increases in, tariffs or value added taxes, or other changes in the application of existing taxes, in markets in which we are currently active, or may be active in the future, or on specific products that we sell or with which our products compete, could have an adverse effect on our results of operations and financial condition.
The United States and other countries in which we operate are in the process of implementing the Organization for Economic Co-operation and Development’s (OECD) Base Erosion and Profit Shifting Project (BEPS). BEPS is intended to improve tax disclosure and transparency and eliminate structures and activities that could be perceived by a particular country as resulting in tax avoidance. The OECD is currently developing a framework in order to assist member countries in adopting BEPS related legislation. Each country is permitted to introduce its own legislation to implement BEPS legislation. As a number of our business operations do business across country lines, we are subject to BEPS. The implementation of BEPS could result in tax changes and may adversely affect our provision for income taxes, results of operations and cash flows. In some cases, BEPS legislation could result in double taxation in a portion of our profits without an appropriate mechanism to recover the incremental tax amount in another jurisdiction.
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Our business is subject to risks involving derivatives and the risk that our hedging activities might not prevent losses.
We may utilize natural gas derivatives to hedge our financial exposure to the price volatility of natural gas, the principal raw material used in the production of nitrogen-based products. We have used natural gas futures, swaps and option contracts traded in over-the-counter markets or on exchanges. We have also used fixed-price, physical purchase and sales contracts to hedge our exposure to natural gas price volatility. In order to manage our exposure to changes in foreign currency exchange rates, we may from time to time use foreign currency derivatives (primarily forward exchange contracts).
Our use of derivatives can result in volatility in reported earnings due to the unrealized mark-to-market adjustments that occur from changes in the value of the derivatives that do not qualify for, or to which we do not apply, hedge accounting. To the extent that our derivative positions lose value, we may be required to post collateral with our counterparties, adversely affecting our liquidity.
Hedging arrangements are imperfect and unhedged risks will always exist. In addition, our hedging activities may themselves give rise to various risks that could adversely affect us. For example, we are exposed to counterparty credit risk when our derivatives are in a net asset position. The counterparties to our derivatives are multi-national commercial banks, major financial institutions or large energy companies.
Our liquidity could be negatively impacted by a counterparty default on settlement of one or more of our derivative financial instruments or by the triggering of any cross default provisions or credit support requirements against us. Additionally, the International Swaps and Derivative Association master netting arrangements for most of our derivative instruments contain credit-risk-related contingent features, such as cross default provisions and credit support requirements. In the event of certain defaults or a credit ratings downgrade, our counterparty may request early termination and net settlement of certain derivative trades or may require us to collateralize derivatives in a net liability position.
At other times we may not utilize derivatives or derivative strategies to hedge certain risks or to reduce the financial exposure of price volatility. As a result, we may not prevent certain material adverse impacts that could have been mitigated through the use of derivative strategies.
Environmental and Regulatory Risks
We are subject to numerous environmental, health and safety laws, regulations and permitting requirements, as well as potential environmental liabilities, which may require us to make substantial expenditures.
We are subject to numerous environmental, health and safety laws and regulations in the United States, Canada, the United Kingdom, the European Union, the Republic of Trinidad and Tobago and other locations, including laws and regulations relating to the generation and handling of hazardous substances and wastes; the cleanup of hazardous substance releases; the discharge of regulated substances to air or water; and the demolition of existing plant sites upon permanent closure. In the United States, these laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act, the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), the Toxic Substances Control Act and various other federal, state, provincial, local and international laws.
As a producer of nitrogen fertilizer products working with hazardous substances, our business faces risks of spills, discharges or other releases of those substances into the environment. Certain environmental laws, including CERCLA, impose joint and several liability, without regard to fault, for cleanup costs on persons who have disposed of or released hazardous substances into the environment. Given the nature of our business, we have incurred, are incurring currently, and are likely to incur periodically in the future, liabilities under CERCLA and other environmental cleanup laws at our current facilities or facilities previously owned by us or other acquired businesses, adjacent or nearby third-party facilities or offsite disposal locations. The costs associated with future cleanup activities that we may be required to conduct or finance may be material. Additionally, we may become liable to third parties for damages, including personal injury and property damage, resulting from the disposal or release of hazardous substances into the environment.
Violations of environmental, health and safety laws can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. Environmental, health and safety laws change regularly and have tended to become more stringent over time. As a result, we have not always been and may not always be in compliance with all environmental, health and safety laws and regulations. We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial expenditures. Our costs to comply with, or any liabilities under, these laws and regulations could have a material adverse effect on our business, financial condition, results of operations and cash flows.
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From time to time, our production, distribution or storage of anhydrous ammonia has resulted in accidental releases that have temporarily disrupted our operations and/or resulted in liability for administrative penalties and/or claims for personal injury. To date, our costs to resolve these liabilities have not been material. However, we could incur significant costs if our liability coverage is not sufficient to pay for all or a large part of any judgments against us, or if our insurance carrier refuses coverage for these losses.
We hold numerous environmental and other governmental permits and approvals authorizing operations at each of our facilities. Expansion or modification of our operations is predicated upon securing necessary environmental or other permits or approvals. A decision by a government agency to deny or delay issuing a new or renewed regulatory material permit or approval, or to revoke or substantially modify an existing permit or approval, or a determination that we have violated a law or permit as a result of a governmental inspection of our facilities could have a material adverse effect on our ability to continue operations at our facilities and on our business, financial condition, results of operations and cash flows.
Future regulatory or legislative restrictions on greenhouse gas (GHG) emissions in the jurisdictions in which we operate could materially adversely affect our business, financial condition, results of operations and cash flows.
We are subject to GHG regulations in the United Kingdom, Canada and the United States. In the United States, our existing facilities currently are only subject to GHG emissions reporting obligations, although new facilities that we build, or existing facilities that we modify in the future, could be subject to GHG emissions standards included in their air permits. Our facilities in the United Kingdom have been subject to the European Union Emissions Trading System (EU ETS), which generally required us to hold or obtain emissions allowances to offset GHG emissions from those aspects of our operations that are subject to regulation under this program. Notwithstanding the exit of the United Kingdom from the European Union (Brexit) on January 31, 2020, facilities in the United Kingdom remained subject to the EU ETS through the end of 2020. Beginning on January 1, 2021, our U.K. manufacturing plants became subject to the UK Emissions Trading Scheme (UK ETS). At least initially, the UK ETS is expected to be similar to the EU ETS, although the UK government has stated that it intends to establish an emissions cap that is lower than what it would have been had the United Kingdom remained subject to the EU ETS. No agreement has been reached as to whether the UK ETS will establish a linkage with the EU ETS or other national emission trading systems. Our Medicine Hat Nitrogen Complex, in Alberta, Canada, and our Courtright Nitrogen Complex, in Ontario, Canada, are subject to provincial or federal laws that impose a price on excess GHG emissions. Each of these laws establishes carbon dioxide equivalent (CO2e) emissions standards applicable to our facilities in terms of emissions per unit of production, with the provincial laws and the federal law using different formulas for establishing these intensity limits and changes in these limits over time. If CO2e emissions exceed the applicable limits, the excess emissions must be offset, either through obtaining qualifying emission credits or offsets or by making a payment for each ton of excess emissions. The Canadian federal government has announced that it intends to increase the price of excess emissions of CO2e from CAD $40 per ton in 2021 and CAD $50 per ton in 2022, by CAD $15 per ton each year beginning in 2023, with the price of excess CO2e emissions reaching CAD $170 per ton by 2030.
On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement was accepted by the United States and ratified by Canada and the United Kingdom and went into effect in November 2016. The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5ºC above pre-industrial levels. Each signatory is required to develop its own national plan to attain this objective. Increasing concern over the impacts of climate change is driving the signatories to establish ever more ambitious GHG reduction targets. In December 2020, the United Kingdom announced a target to reduce GHG emission 68% from 1990 levels by 2030. The EU has announced a new target to reduce its GHG emission 55% below 1990 levels by 2030. On November 4, 2019, the United States submitted formal notice of its withdrawal from the Paris Agreement, which became effective on November 4, 2020, but on January 20, 2021, President Biden announced that the United States has rejoined the Paris Agreement. This will require the United States to submit its own national plan for reducing GHG emissions. Executive Orders issued by the Biden administration, including in particular an executive order issued on January 27, 2021 focusing on climate change, evidence the Administration’s intent to undertake numerous initiatives in an effort to reduce GHG emissions, including promoting renewable energy development, limiting or prohibiting new oil and gas leases on federal lands, and in general, making climate change considerations a critical component of federal policy.
More stringent GHG regulations, if they are enacted, are likely to have a significant impact on us, because our production facilities emit GHGs such as carbon dioxide and nitrous oxide and because natural gas, a fossil fuel, is a primary raw material used in our nitrogen production process. Regulation of GHGs may require us to make changes in our operating activities that would increase our operating costs, reduce our efficiency, limit our output, require us to make capital improvements to our facilities, increase our costs for or limit the availability of energy, raw materials or transportation, or otherwise materially adversely affect our business, financial condition, results of operations and cash flows. In addition, to the extent that GHG
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restrictions are not imposed in countries where our competitors operate or are less stringent than regulations that may be imposed in the United States, Canada or the United Kingdom, our competitors may have cost or other competitive advantages over us.
Strategic Risks
The market for green and low-carbon ammonia may be slow to develop, may not develop to the size expected or may not develop at all. Moreover, we may not be successful in the development and implementation of our green and low-carbon ammonia projects in a timely or economic manner, or at all, due to a number of factors, many of which are beyond our control.
The market for green and low-carbon ammonia is developing and evolving, may not develop to the size or at the rate we expect, and is dependent in part on the developing market for green and low-carbon hydrogen. These markets are heavily influenced by federal, state and local government laws, regulations and policies concerning carbon emissions and clean energy in the United States and abroad.
We believe the demand for green and low-carbon ammonia will take several years to fully develop and mature and we cannot be certain that this market or the market for green and low-carbon hydrogen will grow to the size or at the rate we expect. Hydrogen currently only accounts for less than 1% of the world’s energy needs.
The recognition and acceptance of green and low-carbon ammonia as a transport and storage mechanism for green and low-carbon hydrogen, the use of green and low-carbon ammonia as a fuel in its own right and the development and growth of end market demand and applications for green and low-carbon hydrogen and green and low-carbon ammonia are uncertain and dependent on a number of factors outside of our control. These factors include, among others, the extent to which and rate at which cost competitive global renewable energy capacity increases, the pricing of alternative sources of energy, the realization of technological improvements required to increase the efficiency and lower the costs of production of green and low-carbon ammonia, the regulatory environment, the rate and extent of infrastructure investment and developments, the availability of tax benefits and other incentives and our ability to provide green and low-carbon ammonia offerings cost-effectively. If a sustainable market fails to develop or develops more slowly than we anticipate, we may decide not to implement, or may not be successful in implementing, one or more elements of our multi-year strategic plan and commitment to a clean fuel economy.
Our clean energy strategy also depends on the realization of certain technical improvements required to increase the efficiency and lower the costs of production of green and low-carbon ammonia. Over time, as we seek to convert additional existing production facilities and further expand our green ammonia and low-carbon ammonia production capacity, we may face operational difficulties and execution risks related to the design, development and construction. If our assumptions about the engineering and process characteristics necessary to successfully build the facility capacity that we are contemplating and to scale up to larger production quantities prove to be incorrect, we may be unable to produce substantial quantities of green or low-carbon ammonia, and the cost to construct or convert such green and low-carbon ammonia facilities, or the production costs associated with the operation of such facilities, may be higher than we project.
We may not be successful in the expansion of our business.
We routinely consider possible expansions of our business, both within the United States and elsewhere. Major investments in our business, including as a result of acquisitions, partnerships, joint ventures, business combination transactions or other major investments, such as our green and low-carbon ammonia projects, require significant managerial resources, the diversion of which from our other activities or opportunities may impair the existing operations of our business. We may be unable to identify or successfully compete for certain acquisition targets, which may hinder or prevent us from acquiring a target or completing other transactions. The risks of any expansion of our business through investments, acquisitions, partnerships, joint ventures or business combination transactions are increased due to the significant capital and other resources that we may have to commit to any such expansion, which may not be recoverable if the expansion initiative to which they were devoted is ultimately not implemented. In addition, these efforts may require capital resources that could otherwise be used for the improvement and expansion of our existing business. As a result of these and other factors, including general economic risk, we may not be able to realize our projected returns from any future acquisitions, partnerships, joint ventures, business combination transactions or other major investments. Among the risks associated with the pursuit and consummation of acquisitions, partnerships, joint ventures or other major investments or business combinations are those involving:
difficulties in integrating the parties’ operations, systems, technologies, products and personnel;
incurrence of significant transaction-related expenses;
potential integration or restructuring costs;
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potential impairment charges related to the goodwill, intangible assets or other assets to which any such transaction relates, in the event that the economic benefits of such transaction prove to be less than anticipated;
other unanticipated costs associated with such transactions;
our ability to achieve operating and financial efficiencies, synergies and cost savings;
our ability to obtain the desired financial or strategic benefits from any such transaction;
the parties’ ability to retain key business relationships, including relationships with employees, customers, partners and suppliers;
potential loss of key personnel;
entry into markets or involvement with products with which we have limited current or prior experience or in which competitors may have stronger positions;
assumption of contingent liabilities, including litigation;
exposure to unanticipated liabilities;
differences in the parties’ internal control environments, which may require significant time and resources to resolve in conformity with applicable legal and accounting standards;
increased scope, geographic diversity and complexity of our operations;
the tax effects of any such transaction; and
the potential for costly and time-consuming litigation, including stockholder lawsuits.
In addition, major capital projects may be dependent on the availability and performance of engineering firms, construction firms, equipment suppliers, transportation providers and other vendors necessary to design and implement those projects on a timely basis and on acceptable terms. Major investments such as capital improvements at our facilities are subject to a number of risks, any of which could prevent us from completing capital projects in a timely or economic manner or at all, including, without limitation, cost overruns, non-performance of third parties, the inability to obtain necessary permits or other permitting matters, adverse weather, defects in materials and workmanship, labor and raw material shortages, transportation constraints, engineering and construction change orders, errors in design, construction or start-up, and other unforeseen difficulties.
International acquisitions, partnerships, joint ventures, investments or business combinations and other international expansions of our business involve additional risks and uncertainties, including, but not limited to:
the impact of particular economic, tax, currency, political, legal and regulatory risks associated with specific countries;
challenges caused by distance and by language and cultural differences;
difficulties and costs of complying with a wide variety of complex laws, treaties and regulations;
unexpected changes in regulatory environments;
political and economic instability, including the possibility for civil unrest;
nationalization of properties by foreign governments;
tax rates that may exceed those in the United States, and earnings that may be subject to withholding requirements;
the imposition of tariffs, exchange controls or other restrictions; and
the impact of currency exchange rate fluctuations.
If we finance acquisitions, partnerships, joint ventures, business combination transactions or other major investments by issuing equity or convertible or other debt securities or loans, our existing stockholders may be diluted or we could face constraints under the terms of, and as a result of the repayment and debt-service obligations under, the additional indebtedness. A business combination transaction between us and another company could result in our stockholders receiving cash or shares of another entity on terms that such stockholders may not consider desirable. Moreover, the regulatory approvals associated with a business combination may result in divestitures or other changes to our business, the effects of which are difficult to predict.
We are subject to risk associated with our strategic venture with CHS Inc. (CHS).
We may not realize the full benefits from our strategic venture with CHS that are expected. The realization of the expected benefits of the CHS strategic venture depends on our ability to operate and manage the strategic venture successfully, and on the market prices of the nitrogen fertilizer products that are the subject of our supply agreement with CHS over the life of the agreement, among other factors. Additionally, any challenges related to the CHS strategic venture could harm our relationships with CHS or our other customers.
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COVID-19 Pandemic Risk
Our business and operations may be adversely affected by the COVID-19 pandemic.
The outbreak and pandemic of the coronavirus disease 2019 (COVID-19) could have a material and adverse effect on our business, financial condition, results of operations or cash flows. The rapid spread of COVID-19 has resulted in governmental authorities implementing numerous measures to try to contain the virus, such as travel bans and restrictions, quarantines, shelter in place orders and shutdowns. Even though our business operations are designated as part of the critical infrastructure by the United States, United Kingdom and Canadian governments and the governments of the states and provinces in which we operate, these measures have impacted and may further impact all or portions of our workforce and operations. If significant portions of our workforce are unable to work effectively, including because of illness, quarantines, government actions, facility closures or other restrictions, we may be unable to meet customer demand or perform fully under our contracts.
In addition, our customers, suppliers and third party service providers, including transportation providers, have been, or may be in the future, affected by COVID-19, including by the impact of measures taken by federal and local governments to slow the spread of the virus. Any negative impacts on our customers, suppliers and third party service providers could negatively impact our business, financial condition, results of operations or cash flows. For example, global demand for nitrogen for industrial use has been negatively affected by the pandemic, and we expect this to continue as long as economic activity remains low due to the impacts of the pandemic. Restrictions on or disruptions of transportation, port closures or increased border controls or closures, or other impacts on domestic and global supply chains or distribution channels, could increase our costs, limit our ability to meet customer demand or otherwise have a material adverse effect on our business, financial condition, results of operations or cash flows.
The COVID-19 pandemic has reduced and may further reduce the demand for energy, including crude oil, as well as natural gas and coal, which are nitrogen feedstocks. Reduced demand for nitrogen feedstocks has reduced and could further reduce the cost of nitrogen production outside of North America, increasing global nitrogen supply and reducing the market prices of our products. Lower demand for crude oil could also reduce the supply and therefore increase the cost of natural gas, which is the principal raw material used in our production of nitrogen fertilizers. In addition, lower crude oil prices, and a reduced demand for gasoline resulting from actions to slow the spread of COVID-19, have reduced ethanol production and therefore negatively impacted the demand for corn, which is a significant factor driving customer demand for our nitrogen fertilizers. The pandemic has also disrupted traditional food supply chains, which may have a material impact on livestock and food demand, including the demand for corn. Each of these consequences could have a material adverse effect on our business, financial condition, results of operations or cash flows.
While the COVID-19 pandemic did not have a material adverse effect on our reported results for the year ended December 31, 2020, we are unable to predict the ultimate impact it may have on our business, financial condition, results of operations or cash flows. The extent to which our operations may be impacted by COVID-19 will depend on future developments, which are highly uncertain and cannot be accurately predicted, including the further spread of the virus, the duration of the COVID-19 outbreak and the type and duration of actions that may be taken by various governmental authorities in response to the outbreak. The pandemic significantly increased global market uncertainty and caused an economic slowdown, which resulted in a global recession. Persistent weakness in economic activity caused by a deterioration of global market and economic conditions could materially adversely affect our business, financial condition, results of operations or cash flows.
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FORWARD LOOKING STATEMENTS
From time to time, in this Annual Report on Form 10-K as well as in other written reports and oral statements, we make forward-looking statements that are not statements of historical fact and may involve a number of risks and uncertainties. These statements relate to analyses and other information that are based on forecasts of future results and estimates of amounts not yet determinable. These statements may also relate to our prospects, future developments and business strategies. We have used the words “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “predict,” “project,” “will” or “would” and similar terms and phrases, including references to assumptions, to identify forward-looking statements in this document. These forward-looking statements are made based on currently available competitive, financial and economic data, our current expectations, estimates, forecasts and projections about the industries and markets in which we operate and management’s beliefs and assumptions concerning future events affecting us. These statements are not guarantees of future performance and are subject to risks, uncertainties and factors relating to our operations and business environment, all of which are difficult to predict and many of which are beyond our control. Therefore, our actual results may differ materially from what is expressed in or implied by any forward-looking statements. We want to caution you not to place undue reliance on any forward-looking statements. We do not undertake any responsibility to release publicly tradedany revisions to these forward-looking statements to take into account events or listedcircumstances that occur after the date of this document. Additionally, we do not undertake any responsibility to provide updates regarding the occurrence of any unanticipated events which may cause actual results to differ from those expressed or implied by the forward-looking statements contained in this document.
Important factors that could cause actual results to differ materially from our expectations are disclosed under “Risk Factors” and elsewhere in this Annual Report on Form 10-K. Such factors include, among others:
the cyclical nature of our business and the impact of global supply and demand on our selling prices;
the global commodity nature of our nitrogen products, the conditions in the international market for nitrogen products, and the intense global competition from other producers;
conditions in the United States, Europe and other agricultural areas;
the volatility of natural gas prices in North America and Europe;
weather conditions;
the seasonality of the fertilizer business;
the impact of changing market conditions on our forward sales programs;
difficulties in securing the supply and delivery of raw materials, increases in their costs or delays or interruptions in their delivery;
reliance on third party providers of transportation services and equipment;
risks associated with cyber security;
our reliance on a limited number of key facilities;
acts of terrorism and regulations to combat terrorism;
risks associated with international operations;
the significant risks and hazards involved in producing and handling our products against which we may not be fully insured;
our ability to manage our indebtedness and any additional indebtedness that may be incurred;
our ability to maintain compliance with covenants under our revolving credit agreement and the agreements governing our indebtedness;
downgrades of our credit ratings;
risks associated with changes in tax laws and disagreements with taxing authorities;
risks involving derivatives and the effectiveness of our risk measurement and hedging activities;
potential liabilities and expenditures related to environmental, health and safety laws and regulations and permitting requirements;
regulatory restrictions and requirements related to greenhouse gas emissions;
the development and growth of the market for green and low-carbon ammonia and the risks and uncertainties relating to the development and implementation of our green and low-carbon ammonia projects;
risks associated with expansions of our business, including unanticipated adverse consequences and the significant resources that could be required;
risks associated with the operation or management of the CHS strategic venture, risks and uncertainties relating to the market prices of the fertilizer products that are the subject of our supply agreement with CHS over the life of the supply agreement, and the risk that any challenges related to the CHS strategic venture will harm our other business relationships; and
the impact of the novel coronavirus disease 2019 (COVID-19) pandemic, including measures taken by governmental authorities to slow the spread of the virus, on our business and operations.
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ITEM 1B.    UNRESOLVED STAFF COMMENTS.
None.
ITEM 2.    PROPERTIES.
Information regarding our facilities and properties is included in Item 1. Business—Reportable Segments and Item 1. Business—Storage Facilities and Other Properties.
Certain of our distribution and storage facilities in the United States are subject to mortgages securing obligations under the Revolving Credit Agreement and our senior secured notes. For additional information, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt.
ITEM 3.    LEGAL PROCEEDINGS.
Litigation
West Fertilizer Co.
On April 17, 2013, there was a fire and explosion at the West Fertilizer Co. fertilizer storage and distribution facility in West, Texas. According to published reports, 15 people were killed and approximately 200 people were injured in the incident, and the fire and explosion damaged or destroyed a number of homes and buildings around the facility. Various subsidiaries of CF Industries Holdings, Inc. (the CF Entities) were named as defendants along with other companies in lawsuits filed in 2013, 2014 and 2015 in the District Court of McLennan County, Texas by the City of West, individual residents of the County and other parties seeking recovery for damages allegedly sustained as a result of the explosion. The cases were consolidated for discovery and pretrial proceedings in the District Court of McLennan County under the caption “In re: West Explosion Cases.” The two-year statute of limitations expired on April 17, 2015. As of that date, over 400 plaintiffs had filed claims, including at least 9 entities, 325 individuals, and 80 insurance companies. Plaintiffs allege various theories of negligence, strict liability, and breach of warranty under Texas law. Although we do not own or operate the facility or directly sell our products to West Fertilizer Co., products that the CF Entities manufactured and sold to others were delivered to the facility and may have been stored at the West facility at the time of the incident.
The Court granted in part and denied in part the CF Entities’ Motions for Summary Judgment in August 2015. Over three hundred cases have been resolved pursuant to confidential settlements that have been or we expect will be fully funded by insurance. The remaining cases are in various stages of discovery and pre-trial proceedings. The next group of cases is expected to be set for trial after the Court resumes scheduling civil jury trials currently on hold because of the coronavirus disease 2019 (COVID-19) pandemic. We believe we have strong legal and factual defenses and intend to continue defending the CF Entities vigorously in the pending lawsuits. The Company cannot provide a range of reasonably possible loss due to the uncertain nature of this litigation, including uncertainties around the potential allocation of responsibility by a jury to other defendants or responsible third parties. The recognition of a potential loss in the future in the West Fertilizer Co. litigation could negatively affect our results in the period of recognition. However, based upon currently available information, including available insurance coverage, we do not believe that this litigation will have a material adverse effect on our consolidated financial position, results of operations or cash flows.
Environmental
For information on pending proceedings relating to environmental remediation matters, see Item 1. Business—Environmental, Health and Safety—CERCLA/Remediation Matters and Note 20—Contingencies to our consolidated financial statements included in Item 8 of this report.
ITEM 4.    MINE SAFETY DISCLOSURES.
Not applicable.
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PART II
ITEM 5.    MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES.
Our common stock is traded on the New York Stock Exchange.Exchange under the symbol “CF.” As of February 16, 2021, there were 682 stockholders of record.
The following table sets forth share repurchases, on a trade date basis, for each of the three months of the quarter ended December 31, 2020:
 Issuer Purchases of Equity Securities
Period
Total
number
of shares
(or units)
purchased(1)
 Average
price paid
per share
(or unit)
 
Total number of
shares (or units)
purchased as part of
publicly announced
plans or programs
(2)
Maximum number (or
approximate dollar
value) of shares (or
units) that may yet be
purchased under the
plans or programs
(in thousands)
(2)
October 1, 2020 - October 31, 20205,059 $31.33 — $563,407 
November 1, 2020 - November 30, 2020— — — 563,407 
December 1, 2020 - December 31, 202070,392 39.54 — 563,407 
Total75,451  $38.99 — 

(1)Represents shares withheld to pay employee tax obligations upon the lapse of restrictions on restricted stock units and the exercise of nonqualified stock options.
(2)On February 13, 2019, our Board of Directors authorized management to repurchase CF Holdings common stock for a total expenditure of up to $1 billion through December 31, 2021. This share repurchase program is discussed in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Share Repurchase Program and in Note 18—Stockholders’ Equity, in the notes to the consolidated financial statements included in Item 8. Financial Statements and Supplementary Data.



ITEM 6.    [RESERVED]



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ITEM 7.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.
You should read the following discussion and analysis in conjunction with the consolidated financial statements and related notes included in Item 8. Financial Statements and Supplementary Data. All references to “CF Holdings,” “we,” “us,” “our” and “the Company” refer to CF Industries Holdings, Inc. and its subsidiaries, except where the context makes clear that the reference is only to CF Industries Holdings, Inc. itself and not its subsidiaries. All references to “CF Industries” refer to CF Industries, Inc., a 100% owned subsidiary of CF Industries Holdings, Inc. References to tons refer to short tons. Notes referenced in this discussion and analysis refer to the notes to consolidated financial statements that are found in Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements. For a discussion and analysis of the year ended December 31, 2019 compared to December 31, 2018, you should read Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations in our 2019 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 24, 2020. The following is an outline of the discussion and analysis included herein:
Overview of CF Holdings
Our Company
Our Commitment to a Clean Energy Economy
Industry Factors
Market Conditions and Current Developments
Financial Executive Summary
Items Affecting Comparability of Results
Consolidated Results of Operations
Operating Results by Business Segment
Liquidity and Capital Resources
Critical Accounting Estimates
Recent Accounting Pronouncements
Subsequent Event
Overview of CF Holdings
Our Company
We are a leading global manufacturer of hydrogen and nitrogen products for clean energy, fertilizer, emissions abatement, and other industrial applications. We operate nitrogen manufacturing complexes in the United States, Canada and the United Kingdom, which are among the most cost-advantaged, efficient and flexible in the world, and an extensive storage, transportation and distribution network in North America. Our 3,000 employees focus on safe and reliable operations, environmental stewardship and disciplined capital and corporate management, driving our strategy to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our principal customers are cooperatives, independent fertilizer distributors, traders, wholesalers and industrial users. Our core product is anhydrous ammonia (ammonia), which contains 82% nitrogen and 18% hydrogen. Our nitrogen products that are upgraded from ammonia are granular urea, urea ammonium nitrate solution (UAN) and ammonium nitrate (AN). Our other nitrogen products include diesel exhaust fluid (DEF), urea liquor, nitric acid and aqua ammonia, which are sold primarily to our industrial customers, and compound fertilizer products (NPKs), which are solid granular fertilizer products for which the nutrient content is a combination of nitrogen, phosphorus and potassium.
Our principal assets as of December 31, 2020 include:
five U.S. nitrogen manufacturing facilities, located in Donaldsonville, Louisiana (the largest nitrogen complex in the world); Port Neal, Iowa; Yazoo City, Mississippi; Verdigris, Oklahoma; and Woodward, Oklahoma. These facilities are wholly owned directly or indirectly by CF Industries Nitrogen, LLC (CFN), of which we own approximately 89% and CHS Inc. (CHS) owns the remainder. See Note 17—Noncontrolling Interests for additional information on our strategic venture with CHS;
two Canadian nitrogen manufacturing facilities, located in Medicine Hat, Alberta (the largest nitrogen complex in Canada) and Courtright, Ontario;
two United Kingdom nitrogen manufacturing facilities, located in Billingham and Ince;
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an extensive system of terminals and associated transportation equipment located primarily in the Midwestern United States; and
a 50% interest in Point Lisas Nitrogen Limited (PLNL), an ammonia production joint venture located in the Republic of Trinidad and Tobago that we account for under the equity method.
Our Commitment to a Clean Energy Economy
In October 2020, we announced that we are taking significant steps to support a global hydrogen and clean fuel economy, through the production of green and low-carbon ammonia. Since ammonia is one of the most efficient ways to transport and store hydrogen and is also a fuel in its own right, we believe that the Company, as the world’s largest producer of ammonia, with an unparalleled manufacturing and distribution network and deep technical expertise, is uniquely positioned to fulfill anticipated demand for hydrogen and ammonia from green and low-carbon sources. Our strategy is to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our approach will focus on green ammonia production, which refers to ammonia produced through a carbon-free process, and low-carbon ammonia, which relates to ammonia produced by conventional processes but with CO2 removed through carbon capture and sequestration (CCS) and other certified carbon abatement projects. We have announced an initial green ammonia project at our flagship Donaldsonville nitrogen complex to produce approximately 20,000 tons per year of green ammonia. Additionally, we are developing CCS and other carbon abatement projects across our production facilities that will enable us to produce low-carbon ammonia.
Industry Factors
We operate in a highly competitive, global industry. Our operating results are influenced by a broad range of factors, including those outlined below.
Global Supply and Demand Factors
Our products are globally traded commodities and are subject to price competition. The customers for our products make their purchasing decisions principally on the basis of delivered price and, to a lesser extent, on customer service and product quality. The selling prices of our products fluctuate in response to global market conditions, changes in supply and demand and different cost factors.
Historically, global fertilizer demand has been driven primarily by population growth, gross domestic product growth, changes in dietary habits, planted acreage, and application rates, among other things. We expect these key variables to continue to have major impacts on long-term fertilizer demand for the foreseeable future. Short-term fertilizer demand growth may depend on global economic conditions, farm sector income, weather patterns, the level of global grain stocks relative to consumption, fertilizer application rates, and governmental regulations, including fertilizer subsidies or requirements mandating increased use of bio-fuels or industrial nitrogen products and farm sector income.products. Other geopolitical factors like temporary disruptions in fertilizer trade related to government intervention or changes in the buying/selling patterns of key exporting/consuming countries such as China, India, Russia and Brazil, among others, often play a major role in shaping near-term market fundamentals. The economics of nitrogen-based fertilizer manufacturing play a key role in decisions to increase or reduce production capacity. Supply of fertilizers is generally driven by available capacity and operating rates, raw material costs and availability, government policies and global trade. Raw materials are dependent on energy sources such as natural gas or coal; therefore, supply costs are affected by the supply of and demand for these commodities.
Over the last decade, strong demand, high capacity utilization and increasing operating margins as a result of higher global nitrogen fertilizer prices stimulated global investment in nitrogen production facilities, which resulted in an increase in global nitrogen fertilizer production capacity. As a result, global nitrogen fertilizer capacity increased faster than global nitrogen fertilizer demand, creating a surplus of global nitrogen capacity in the market, and leading to lower nitrogen fertilizer selling prices. In addition, global feedstock commodity prices declined, including coal and oil-linked gas, contributing to the lower nitrogen fertilizer prices.

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Global Trade in Fertilizer
In addition to the relationship between global supply and demand, profitability within a particular geographic region is determined by the supply/demand balance within that region. Regional supply and demand can be influenced significantly by factors affecting trade within regions. Some of these factors include the relative cost to produce and deliver product, relative currency values, the availability of credit and governmental trade policies.policies, including the imposition of duties, tariffs or quotas, that affect foreign trade or investment. The development of additional natural gas reserves in North America over the last decade has decreased natural gas costs relative to the rest of the world, making North American nitrogen fertilizer producers more competitive. These lower natural gas costs contributed to announcements of several nitrogen fertilizer capacity expansion projects in North America, including our capacity expansion projects in Donaldsonville, Louisiana and Port Neal, Iowa, which were completed in December 2016. Changes in currency values may also alter our cost competitiveness relative to producers in other regions of the world.
Imports account for a significant portion of the nitrogen fertilizer consumed in North America. Producers of nitrogen-based fertilizers located in the Middle East, Ukraine, the Republic of Trinidad and Tobago, Venezuela, North Africa Russia and ChinaRussia have been major exporters to North America.America in recent years. As a result, the North American nitrogen fertilizer market is dependent on imports to balance supply and demand.
Farmers'
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Farmers’ Economics
The demand for fertilizer is affected by the aggregate crop planting decisions and fertilizer application rate decisions of individual farmers. Individual farmers make planting decisions based largely on prospective profitability of a harvest, while the specific varieties and amounts of fertilizer they apply depend on factors like their current liquidity, soil conditions, weather patterns, crop prices, fertilizer products used and timing of applications, expected yields and the types of crops planted.


Market Conditions and Current Developments
COVID-19 Pandemic
In March 2020, the World Health Organization characterized the outbreak of coronavirus disease 2019 (COVID-19) as a pandemic. Since that time, efforts to slow the spread of COVID-19 have intensified. A number of countries, as well as certain states and cities within the United States, have continued to enact temporary closures of businesses, to issue shelter in place or quarantine orders, and to take other restrictive measures in response to the pandemic.
Due to the use of fertilizer products in crop production to support the global food supply chain, our business operations were designated as part of the critical infrastructure by the United States and as essential businesses in the United Kingdom and Canada, with corresponding designations for those states and provinces in which we operate that issued restrictive orders. As a result, our manufacturing complexes continued to operate during 2020 and have continued to operate through the date of this report. Our production of ammonia, the basic building block for our products, was 10.4 million tons in 2020 compared to 10.2 million tons in 2019. Through the date of this filing, we have continued to ship products by all modes of transportation to our customers, and we have not experienced any significant delays in marine, rail or truck transportation services due to the pandemic.
In 2020, we did not experience a meaningful impact in customer demand as a result of the COVID-19 pandemic. Our total volume of products shipped in 2020 of 20.3 million tons was 4% higher compared to 19.5 million tons in 2019.
In response to the pandemic, we instituted safety precautions early in 2020 to protect the health and well-being of all of our employees, including the manufacturing workforce who operate our nitrogen complexes and distribution facilities. These safety measures included installing thermal temperature checks at each of our sites for all personnel, including contractors, who arrive at our sites, adjusting schedules to support social distancing, including changes to loading and shipping procedures, maintaining a close contact log for employees, self-quarantine logs, requiring face coverings on site, restricting visitor access, and implementing enhanced cleaning protocols and travel restrictions for employees. We also paid approximately $19 million of bonuses to our operational workforce under a special COVID-19 bonus program, which concluded in June 2020. In addition, since mid-March 2020, the majority of our non-operational personnel at our sites who work in administrative and operational support functions have worked remotely in order to maintain social distancing following governmental guidelines. These administrative and operational support functions have operated effectively during this period, meeting our commitments to our customers and continuing to manage our business without interruption. We have not furloughed any employees or instituted any reductions in pay or benefits or other significant cost containment measures due to the pandemic.
We participate in a global market, which includes a global supply chain and customer base. The long-term effects of the COVID-19 pandemic are unclear and could adversely affect our business in the future. We have operated our business in a remote working environment and could continue to do so for an extended duration, if necessary. However, if the pandemic were to impact a large portion of our workforce in any one location, we might need to idle that facility temporarily or transfer other employees from other network sites, which could have an impact on our business operations, profitability and cash flow. The impact of the COVID-19 pandemic is fluid and continues to evolve. As a result, we cannot predict the extent to which our business, results of operations, financial condition or liquidity may be impacted by the pandemic in the future.
Sales Volume
There was strong demand for fertilizer in 2020 as we shipped 20.3 million tons of product compared to 19.5 million tons in 2019, which increased net sales by $199 million. The increase in total sales volume was due primarily to the impact of increased supply resulting from both higher inventory levels entering 2020 and higher production in 2020. Our sales volumes in 2020 were higher across all of our major products compared to 2019.
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Our shipments can shift between quarters due primarily to shifts in weather patterns that impact fertilizer applications. During the fourth quarter of 2020, granular urea sales volume was higher as domestic demand strengthened amid increasing crop prices and overall farm economics improved. Additionally, ammonia sales volume in the fourth quarter of 2020 exceeded the fourth quarter of 2019 as a result of increased demand due to an early fall harvest and ideal weather conditions throughout the Midwestern United States.
Sales volume for our products in 2020, 2019 and 2018 is shown in the table below.
 202020192018
 Sales Volume (tons)Net SalesSales Volume (tons)Net SalesSales Volume (tons)Net Sales
 (tons in thousands; dollars in millions)
Ammonia3,767 $1,020 3,516 $1,113 3,135 $1,028 
Granular urea5,148 1,248 4,849 1,342 4,898 1,322 
UAN6,843 1,063 6,807 1,270 7,042 1,234 
AN2,216 455 2,109 506 2,002 460 
Other2,322 338 2,257 359 2,252 385 
Total20,296 $4,124 19,538 $4,590 19,329 $4,429 
We expect sales volumes for our products to return to a range of 19-19.5 million product tons in 2021 due to lower year-end inventory than the year before and lower expected production due to a higher number of planned turnarounds than in 2020.
Selling Prices
The selling prices for all of our major products were lower in 2020 than 2019 as global energy prices remained low, driving higher global nitrogen operating rates and the resulting additional global supply availability. The average selling price for our products for 2020 and 2019 was $203 per ton and $235 per ton, respectively. The decrease in average selling prices of 14% in 2020 from 2019 decreased net sales by $665 million.
Natural Gas Prices
Natural gas is the principal raw material used to produce our nitrogen products. We use natural gas both as a chemical feedstock and as a fuel to produce nitrogen products. Natural gas is a significant cost component of manufactured nitrogen products, representing approximately one-third of our production costs.
Most of our nitrogen fertilizer manufacturing facilities are located in the United States and Canada. As a result, the price of natural gas in North America directly impacts a substantial portion of our operating expenses. Due to increases in natural gas production resulting from the rise in production from shale gas formations, natural gas prices in North America have declined over the last decade, but are subject to volatility. Natural gas prices during 2020 were lower on average than 2019, due in part to reduced energy demand as a result of the COVID-19 pandemic, partially offset by reductions in supply. The daily market price at the Henry Hub, the most heavily-traded natural gas pricing point in North America, fluctuated throughout 2020. The average daily market price at the Henry Hub was $1.99 per MMBtu for 2020 compared to $2.51 per MMBtu for 2019, a decrease of 21%. The price of natural gas decreased in the first half of 2020 and increased in the second half of 2020 with the average daily market price rising at the Henry Hub to $2.47 per MMBtu in the fourth quarter of 2020.
We also have manufacturing facilities located in the United Kingdom. These facilities are subject to fluctuations associated with the price of natural gas in Europe. The major natural gas trading point for the United Kingdom is the National Balancing Point (NBP). The price of natural gas in the United Kingdom during 2020 was lower on average compared to 2019 as a result of increased availability of liquefied natural gas in the global market as well as the global economic downturn related to the COVID-19 pandemic. The average daily market price at NBP was $3.20 per MMBtu for 2020 compared to $4.44 per MMBtu for 2019, a decrease of 28%. The daily market price at NBP also fluctuated throughout 2020 as the price decreased in the first half of 2020 and increased in the second half of 2020 with the average daily market price rising at the NBP to $5.29 per MMBtu in the fourth quarter of 2020.
Natural gas costs in cost of sales, including the impact of realized natural gas derivatives, was $2.24 per MMBtu in 2020, an 18% decrease from $2.74 per MMBtu in 2019, which resulted in an increase in gross margin of approximately $195 million.
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Financial Executive Summary
We reported net earnings attributable to common stockholders of $317 million in 2020 compared to $493 million in 2019, a decline in net earnings of 36%, or $176 million. The decrease in net earnings was due primarily to lower selling prices as lower global energy costs drove higher global operating rates, leading to increased global nitrogen supply availability. The impact of lower selling prices was partially offset by lower realized natural gas costs and higher sales volume, leading to a net decline in gross margin of $373 million in 2020. Gross margin declined from $1,174 million in 2019 to $801 million in 2020. The following describes the significant factors that impacted gross margin:
Average selling prices declined 14% in 2020 to $203 per ton, which decreased gross margin by $665 million,
Realized natural gas costs declined by 18% in 2020 to $2.24 per MMBtu, which increased gross margin by     $195 million,
Sales volume increased 4% to 20.3 million product tons, the highest annual sales volume for the Company. The increase in sales volume increased gross margin by $61 million.
Additionally, net earnings were impacted by lower selling, general and administrative costs, which declined by $33 million due primarily to the impact of lower corporate project activity and travel during the COVID-19 pandemic, and a decline in our annual tax provision of $95 million, driven by lower pre-tax earnings as well as certain favorable discrete tax items, including the impact of the Terra Amended Tax Returns. See discussion under “Items Affecting ComparabilityTerra Amended Tax Returns,” below, for further information.
Diluted net earnings per share attributable to common stockholders decreased $0.76 per share, to $1.47 per share in 2020 compared to $2.23 per share in 2019. This decrease is due primarily to lower net earnings, partially offset by a 3% reduction in diluted weighted-average common shares outstanding due to repurchases made under our share repurchase program. On February 13, 2019, our Board of Directors (the Board) authorized the repurchase of up to $1 billion of CF Holdings common stock through December 31, 2021 (the 2019 Share Repurchase Program). In 2019, we repurchased approximately 7.6 million shares under the 2019 Share Repurchase Program for $337 million. In 2020, we repurchased approximately 2.6 million shares under the 2019 Share Repurchase Program for $100 million. No shares were repurchased under the 2019 Share Repurchase Program in the second, third or fourth quarter of 2020. See discussion under “Liquidity and Capital Resources—Share Repurchase Programs,” below, for further information.
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Items Affecting ComparabilityFinancial Executive Summary
We reported net earnings attributable to common stockholders of Results
Tax Cuts and Jobs Act
On December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act (the "Tax Act" or "Tax Reform") which includes a number of changes to U.S. tax law that affect us. As a result of the Tax Act we recognized a $491 million income tax benefit, which has a significant impact on our 2017 financial results. This impact generally results from the following two major provisions:
Impact of Tax Rate Change on Deferred Tax Liabilities - The most significant impact of Tax Reform is the reduction of the U.S. statutory corporate tax rate from 35% to 21%. This change necessitates the revaluation of all of our U.S. deferred tax balances which resulted in an income tax benefit of $552 million that was recorded in 2017.
Transition Tax (Repatriation Tax) on Foreign Earnings and Profits - Tax Reform requires us to pay U.S. tax on our previously untaxed foreign earnings. Foreign earnings held in the form of cash and cash equivalents are taxed at a 15.5% rate, and the remaining earnings are taxed at an 8% rate. We intend to elect to pay the transition tax in installments over an eight-year period and have recognized a tax charge and liability of $57$317 million in 2017 for this item.
Nitrogen Fertilizer Selling Prices
A significant amount2020 compared to $493 million in 2019, a decline in net earnings of new nitrogen production capacity came on line36%, or $176 million. The decrease in 2016 and 2017, including an increase in production capacity located in North America, which has further increased supply. Additional production capacity is expected to come on line in 2018. As a result, we expect the lower priced environment to continue until global supply and demand become more balanced through a combination of continued demand growth and supply reductions as producers respondnet earnings was due primarily to lower realized margins by takingselling prices as lower global energy costs drove higher cost production facilities off line.
The U.S. Gulf is a major global fertilizer pricing point dueoperating rates, leading to the volume of nitrogen fertilizer that trades there. Through most of 2016, nitrogen pricing at the U.S. Gulf declined, often trading below parity with other international pricing points due to continued imports from various exporting regions and delayed North American buyer interest as a result of greaterincreased global nitrogen supply availability. Seasonal decreases in agricultural demand combined with delayed customer purchasing activity resulted in multi-year lows in nitrogen fertilizer selling prices in the second half of 2016. Early in the first quarter of 2017, prices began to increase as the supply and demand balance tightened in anticipation of spring fertilizer demand for the planting and growing season. However, as the first quarter progressed, increased imports into North America increased fertilizer supply in the region, which pressured selling prices downward as the quarter ended. During the second quarter of 2017, excess supply through imports into the United States that occurred in the first quarter of 2017 continued in the second quarter, negatively impacting selling prices. During the third quarter of 2017, prices hit yearly lows and then selling prices for most nitrogen products increased throughout the quarter, ending higher than at the beginning of the quarter, driven by significantly lower Chinese exports, higher energy and production costs in parts of the world, a weaker U.S. dollar and strong global demand. During the fourth quarter of 2017, certain announced nitrogen industry capacity additions that were expected to occur, were delayed, and certain maintenance outages all led to a favorable supply demand balance and contributed to a rise in nitrogen pricing.
The significant price fluctuations we have experienced in 2017 are symptoms of a market in transition as new capacity comes on line and global trade flows adjust, and this transition is not complete. We expect the final set of North American capacity additions to come fully on line by mid-2018. Should imports of nitrogen products into North America continue at high rates, the oversupply in the region will continue, which could lead to lower prices, similar to those experienced in early 2017. New global nitrogen capacity additions coming on line after 2018 are expected to be lower than recent years, which will support the market transition or more balanced supply and demand.
The greater global nitrogen supply availability and resulting low nitrogen fertilizer selling prices significantly impacted our results. The average selling price for our products for 2017, 2016 and 2015 was $207 per ton, $217 per ton and $314 per ton, respectively. The decline in average selling prices from 2016 to 2017 reduced net sales by $293 million, while the decline in average selling prices from 2015 to 2016 reduced net sales by $1.4 billion. In addition to the direct impact of lower selling prices was partially offset by lower realized natural gas costs and higher sales volume, leading to a net decline in gross margin of $373 million in 2020. Gross margin declined from $1,174 million in 2019 to $801 million in 2020. The following describes the significant factors that impacted gross margin:
Average selling prices declined 14% in 2020 to $203 per ton, which decreased gross margin by $665 million,
Realized natural gas costs declined by 18% in 2020 to $2.24 per MMBtu, which increased gross margin by     $195 million,
Sales volume increased 4% to 20.3 million product tons, the highest annual sales volume for the Company. The increase in sales volume increased gross margin by $61 million.
Additionally, net earnings were impacted by lower selling, general and administrative costs, which declined by $33 million due primarily to the impact of lower corporate project activity and travel during periodsthe COVID-19 pandemic, and a decline in our annual tax provision of declining prices, customers tend$95 million, driven by lower pre-tax earnings as well as certain favorable discrete tax items, including the impact of the Terra Amended Tax Returns. See discussion under “Items Affecting ComparabilityTerra Amended Tax Returns,” below, for further information.
Diluted net earnings per share attributable to delay purchasing fertilizercommon stockholders decreased $0.76 per share, to $1.47 per share in anticipation2020 compared to $2.23 per share in 2019. This decrease is due primarily to lower net earnings, partially offset by a 3% reduction in diluted weighted-average common shares outstanding due to repurchases made under our share repurchase program. On February 13, 2019, our Board of pricesDirectors (the Board) authorized the repurchase of up to $1 billion of CF Holdings common stock through December 31, 2021 (the 2019 Share Repurchase Program). In 2019, we repurchased approximately 7.6 million shares under the 2019 Share Repurchase Program for $337 million. In 2020, we repurchased approximately 2.6 million shares under the 2019 Share Repurchase Program for $100 million. No shares were repurchased under the 2019 Share Repurchase Program in the future being lower than current prices.

second, third or fourth quarter of 2020. See discussion under “Liquidity and Capital Resources—Share Repurchase Programs,” below, for further information.
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During the years ended December 31, 2017, 2016 and 2015, certain significant items impacted our financial results. The following table and related discussion outline these significant items and how they impacted the comparability of our financial results during these periods. Positive amounts in the table below are costs or expenses incurred, while negative amounts are income recognized in the periods presented.
 2017 2016 2015
 Pre-Tax
After-Tax(1)
 Pre-Tax
After-Tax(1)
 Pre-Tax
After-Tax(1)
 (in millions)
Impact of U.S. Tax Cuts and Jobs Act(2)
(491)(491) 

 

Depreciation and amortization(3)
883
558
 678
426
 480
301
Unrealized net mark-to-market loss (gain) on natural gas derivatives(4)
61
39
 (260)(163) 176
111
Loss (gain) on foreign currency transactions including intercompany loans(5)
2
1
 93
93
 (8)
Equity method investment tax contingency accrual(6)
7
7
 

 

Strategic venture with CHS:        
Noncontrolling interest(7)
73
73
 93
93
 

Loss on embedded derivative liability(5)
4
3
 23
14
 

Loss on debt extinguishment53
33
 167
105
 

Debt and revolver amendment fees(8)


 18
11
 

Capacity expansion project expenses(5)


 73
46
 51
32
Start-up costs - Donaldsonville / Port Neal expansion plants(4)


 52
32
 

Loss on foreign currency derivatives(5)


 

 22
13
Transaction costs and termination of agreement with OCI:        
Transaction costs

 179
96
 57
37
Financing costs related to bridge loan commitment fee(9)


 28
18
 6
4
Gain on remeasurement of CF Fertilisers UK investment(6)


 

 (94)(94)
Impairment of equity method investment in PLNL(6)


 134
134
 62
62
(Gain) loss on sale of equity method investments(10)
(14)(9) 

 43
31
Total Impact of Significant Items$578
$214
 $1,278
$905
 $795
$497

(1) The tax impact is calculated utilizing a marginal effective rate of 36.8% in 2017 and 37.2% in both 2016 and 2015.
(2) Included in income tax benefit in our consolidated statements of operations.
(3) Included primarily in cost of sales and selling, general and administrative expenses in our consolidated statements of operations.
(4)    Included in cost of sales in our consolidated statements of operations.
(5) Included in other operating—net in our consolidated statements of operations.
(6) Included in equity in earnings (losses) of operating affiliates in our consolidated statements of operations.
(7) Included in net earnings attributable to noncontrolling interests in our consolidated statements of operations.
(8) Included primarily in interest expense in our consolidated statements of operations.
(9) Included in interest expense in our consolidated statements of operations.
(10) Included in equity in earnings (losses) of operating affiliates (in 2017) and in equity in earnings of non-operating affiliates (in 2015) in our consolidated statements of operations.
The following describes the significant items that impacted the comparability of our financial results in 2017, 2016 and 2015. Descriptions of items below that refer to amounts in the table above, refer to the pre-tax amounts.

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Depreciation and amortization
Total depreciation and amortization expense recognized in 2017, 2016 and 2015 was $883 million, $678 million and $480 million, respectively. This increase in depreciation expense reflects the completion of our capacity expansion projects and placing in service all five of the new plants prior to the end of 2016. The capacity expansion projects were originally announced in 2012 and included the construction of new ammonia, urea, and UAN plants at our Donaldsonville, Louisiana complex and new ammonia and urea plants at our Port Neal, Iowa complex. These plants increased our overall production capacity by approximately 25%, improved our product mix flexibility at Donaldsonville, and improved our ability to serve upper-Midwest urea customers from our Port Neal location. The following table indicates the quarter in which each of the five expansion plants were placed in service.
Quarter placed in serviceExpansion plant location
Q4 2015Donaldsonville Urea
Q1 2016Donaldsonville UAN
Q4 2016Donaldsonville Ammonia
Q4 2016Port Neal Ammonia and Urea
Depreciation expense pertaining to each of our capacity expansion plants commenced once the applicable plant was placed in service.
Unrealized net mark-to-market loss (gain) on natural gas derivatives
Natural gas is typically the largest and most volatile single component of the manufacturing cost for nitrogen-based products. We manage the risk of changes in natural gas prices through the use of derivative financial instruments. The derivatives that we use for this purpose are primarily natural gas fixed price swaps and natural gas options. We use natural gas derivatives as an economic hedge of natural gas price risk, but without the application of hedge accounting. This can result in volatility in reported earnings due to the unrealized mark-to-market adjustments that occur from changes in the value of the derivatives, which is reflected in cost of sales in our consolidated statements of operations. In 2017, 2016 and 2015, we recognized unrealized net mark-to-market losses (gains) on natural gas derivatives of $61 million, $(260) million and $176 million, respectively.
Loss (gain) on foreign currency transactions including intercompany loans
In 2017, 2016 and 2015, we recognized losses (gains) of $2 million, $93 million and $(8) million, respectively, from the impact of changes in foreign currency exchange rates on primarily British pound and Canadian dollar denominated intercompany loans that were not permanently invested.
Equity method investment tax contingency accrual
The Trinidad tax authority (the Board of Inland Revenue) has issued a tax assessment against our equity method investment in the Republic of Trinidad and Tobago, PLNL, related to a dispute over whether tax depreciation must be claimed during a tax holiday period that was granted to PLNL under the Trinidad Fiscal Incentives Act. The tax holiday was granted as an incentive to construct PLNL’s ammonia plant. Based on the facts and circumstances of this matter, PLNL recorded a tax contingency accrual, which reduced our equity in earnings of PLNL for 2017 by approximately $7 million reflecting our 50% ownership interest. In early 2018, PLNL settled this matter with the Board of Inland Revenue for the amounts accrued.
Strategic venture with CHS
We commenced a strategic venture with CHS on February 1, 2016, at which time CHS purchased a minority equity interest in CFN for $2.8 billion. CHS also began receiving deliveries pursuant to a supply agreement under which CHS has the right to purchase annually from CFN up to approximately 1.1 million tons of granular urea and 580,000 tons of UAN at market prices. As a result of its minority equity interest in CFN, CHS is entitled to semi-annual cash distributions from CFN. We are also entitled to semi-annual cash distributions from CFN. The amounts of distributions from CFN to us and CHS are based generally on the profitability of CFN and determined based on the volume of granular urea and UAN sold by CFN to us and CHS pursuant to supply agreements, less a formula driven amount based primarily on the cost of natural gas used to produce the granular urea and UAN, and adjusted for the allocation of items such as operational efficiencies and overhead amounts.
We began recognizing the noncontrolling interest pertaining to CHS’ ownership interest in CFN on February 1, 2016. During 2017 and 2016, we recognized earnings attributable to the noncontrolling interest in CFN of $73 million and

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$93 million, respectively. See Note 16—Noncontrolling Interests for additional information regarding our strategic venture with CHS.
Under the terms of our strategic venture with CHS, if our credit rating as determined by two of three specified credit rating agencies is below certain levels, we are required to make a non-refundable yearly payment of $5 million to CHS. Since our credit ratings were below certain levels in 2016 and 2017, we made a payment of $5 million to CHS in each year. These payments will continue on a yearly basis until the earlier of the date that our credit rating is upgraded to or above certain levels by two of three specified credit rating agencies or February 1, 2026. This obligation is recognized on our consolidated balance sheets as an embedded derivative. During 2017 and 2016, included in other operatingnet in our consolidated statements of operations is a net loss of $4 million and $23 million, respectively.
Debt activity
On December 1, 2017, we redeemed all of the $800 million outstanding principal amount of the 6.875% senior notes due May 2018 (the 2018 Notes) in accordance with the optional redemption provisions provided in the indenture governing the 2018 Notes. The total aggregate redemption price was approximately $817 million. On December 26, 2017, we purchased approximately $300 million aggregate principal amount of the $800 million outstanding principal amount of the 7.125% senior notes due 2020 (the 2020 Notes) pursuant to a tender offer. The aggregate purchase price was approximately $331 million. As a result of the early redemption of the 2018 Notes and the purchase of the 2020 Notes, we recognized a loss on debt extinguishment of $53 million, primarily consisting of $48 million of total premiums paid for the early retirement of debt for the 2018 Notes and 2020 Notes.
In the fourth quarter of 2016, due to the uncertain duration of the prevailing low nitrogen fertilizer selling price environment and in order to provide liquidity and covenant flexibility for the future, we took certain steps with respect to the Revolving Credit Agreement and our senior notes due 2022, 2025 and 2027 (the Private Senior Notes). On November 21, 2016, we prepaid the $1.0 billion aggregate principal amount of the Private Senior Notes, and paid the related make-whole amount of approximately $170 million. We made the prepayment and make-whole payment using the proceeds from an offering of $1.25 billion aggregate principal amount of senior secured notes consisting of $500 million aggregate principal amount of senior secured notes due 2021 and $750 million aggregate principal amount of senior secured notes due 2026 (collectively referred to as the “Senior Secured Notes”). We recognized $167 million of the $170 million cash make-whole payment on the Private Senior Notes as a loss on debt extinguishment, with the $3 million remainder being a debt modification cost that is being amortized over the term of the Senior Secured Notes.
In connection with the completion of the offering of the Senior Secured Notes and the prepayment of the Private Senior Notes in November 2016, certain amendments to the Revolving Credit Agreement became effective. The amendments included, among other things, changes in and additions to the financial and other covenants and a reduction in the size of the facility from $1.5 billion to $750 million.
In conjunction with our debt restructuring, including amendments to the Revolving Credit Agreement, we recognized $18 million of debt issuance and amendment fees in 2016. See further discussion under "Liquidity and Capital Resources" below and Note 11—Financing Agreements for additional information.
Capacity expansion projects
Our capacity expansion projects were completed in the fourth quarter of 2016. Capacity expansion project expenses in 2016 and 2015 of $73 million and $51 million, respectively, are included in other operatingnet in our consolidated statements of operations and generally consisted of administrative costs and other project costs that did not qualify for capitalization.
Start-up costs of $52 million, which primarily relate to the cost of commencing production at the ammonia plants, were incurred in 2016 and are included in cost of sales in our consolidated statements of operations. Losses on foreign currency derivatives of $22 million in 2015 are included in other operatingnet in our consolidated statements of operations and relate to hedges of European euro denominated equipment purchased as part of the capacity expansion projects.

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Transaction costs and termination of agreement with OCI
On August 6, 2015, we entered into a definitive agreement (as amended, the Combination Agreement) to combine with the European, North American and global distribution businesses of OCI N.V. (OCI). On May 22, 2016, CF Holdings, OCI and the other parties to the Combination Agreement entered into a termination agreement (the Termination Agreement) under which the parties agreed to terminate the Combination Agreement by mutual written consent. Pursuant to the Termination Agreement, CF Holdings paid OCI a termination fee of $150 million. Under the Termination Agreement, the parties to the Combination Agreement also agreed to release each other from any and all claims, actions, obligations, liabilities, expenses and fees in connection with, arising out of or related to the Combination Agreement and all ancillary agreements contemplated thereby (other than the confidentiality agreement between CF Holdings and OCI) or the transactions contemplated therein or thereby.
In 2016, we incurred $179 million of transaction costs associated with the proposed combination with certain businesses of OCI and our strategic venture with CHS. This includes the $150 million termination fee paid to OCI in the second quarter of 2016, which is described above, and costs for various consulting and legal services. In 2015, we incurred $57 million of transaction costs associated with the proposed combination with certain businesses of OCI, our strategic venture with CHS, and the acquisition of the remaining 50% equity interest in CF Fertilisers UK not previously owned by us.
On September 18, 2015, in connection with our proposed combination with OCI, we entered into a senior unsecured 364-day Bridge Credit Agreement (as amended, the Bridge Credit Agreement). Upon the termination of the Combination Agreement on May 22, 2016, the lenders' commitment under the Bridge Credit Agreement terminated automatically and we recognized $28 million in bridge loan commitment fees. In 2015, we recognized $6 million of fees related to the initiation of the bridge loan.
CF Fertilisers UK acquisition
On July 31, 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK Group Limited (formerly known as GrowHow UK Group Limited) (CF Fertilisers UK) not previously owned by us for total consideration of $570 million, and CF Fertilisers UK became a wholly owned subsidiary. Upon the acquisition, we recognized a $94 million gain on the remeasurement to fair value of our initial 50% equity investment in CF Fertilisers UK. CF Fertilisers UK Limited (formerly known as GrowHow UK Limited), a wholly owned subsidiary of CF Fertilisers UK, operates two nitrogen manufacturing complexes in the United Kingdom, in the cities of Ince and Billingham. This transaction increased our manufacturing capacity with the acquisition of CF Fertilisers UK’s nitrogen manufacturing complexes. The Ince complex is located in northwestern England and consists of an ammonia plant, three nitric acid plants, an AN plant and three NPK plants. The Billingham complex is located in the Teesside chemical area in northeastern England, and consists of an ammonia plant, three nitric acid plants, a carbon dioxide plant and an AN fertilizer plant.
Equity method investments
In the fourth quarter of 2017, we recognized a gain of $14 million related to the sale of our interest in a joint venture that owns a carbon dioxide liquefaction and purification facility. During 2015, we recognized a loss of $43 million related to the sale of our 50% investment in Keytrade AG and the sale of our 50% investment in an ammonia storage joint venture in Houston, Texas.
Our equity in earnings (losses) of operating affiliates for the years ended December 31, 2016 and 2015, includes an impairment charge of our equity method investment in PLNL of $134 million and $62 million, respectively. PLNL is our joint venture investment in the Republic of Trinidad and Tobago and operates an ammonia plant that relies on natural gas supplied by the National Gas Company of Trinidad and Tobago Limited (NGC) pursuant to a gas sales contract (the NGC Contract). PLNL had experienced curtailments in the supply of natural gas from NGC, which reduced the ammonia production at PLNL. See "Critical Accounting Policies and Estimates" below, for additional information.
See Note 7—Equity Method Investments for additional information regarding our equity method investments.


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Financial Executive Summary
Net earnings (loss)
We reported net earnings attributable to common stockholders of $358$317 million in 20172020 compared to $493 million in 2019, a decline in net earnings of 36%, or $176 million. The decrease in net earnings was due primarily to lower selling prices as lower global energy costs drove higher global operating rates, leading to increased global nitrogen supply availability. The impact of lower selling prices was partially offset by lower realized natural gas costs and higher sales volume, leading to a net lossdecline in gross margin of $277$373 million in 2016, or an2020. Gross margin declined from $1,174 million in 2019 to $801 million in 2020. The following describes the significant factors that impacted gross margin:
Average selling prices declined 14% in 2020 to $203 per ton, which decreased gross margin by $665 million,
Realized natural gas costs declined by 18% in 2020 to $2.24 per MMBtu, which increased gross margin by     $195 million,
Sales volume increased 4% to 20.3 million product tons, the highest annual sales volume for the Company. The increase in sales volume increased gross margin by $61 million.
Additionally, net earnings between the periods of $635 million. Tax Reform had a significant impact on our reported results in 2017 as we recognized $491were impacted by lower selling, general and administrative costs, which declined by $33 million of income in our tax provision relateddue primarily to the enactment of Tax Reform in the United States. Further information regarding the impact of lower corporate project activity and travel during the COVID-19 pandemic, and a decline in our annual tax provision of $95 million, driven by lower pre-tax earnings as well as certain favorable discrete tax items, including the impact of the Terra Amended Tax Reform can be found aboveReturns. See discussion under "Items“Items Affecting Comparability of Results—Terra Amended Tax Cuts and Jobs Act." Returns,” below, for further information.
Diluted net earnings per share attributable to common stockholders was $1.53decreased $0.76 per share, to $1.47 per share in 20172020 compared to diluted net loss$2.23 per share in 2019. This decrease is due primarily to lower net earnings, partially offset by a 3% reduction in diluted weighted-average common shares outstanding due to repurchases made under our share repurchase program. On February 13, 2019, our Board of Directors (the Board) authorized the repurchase of up to $1 billion of CF Holdings common stock through December 31, 2021 (the 2019 Share Repurchase Program). In 2019, we repurchased approximately 7.6 million shares under the 2019 Share Repurchase Program for $337 million. In 2020, we repurchased approximately 2.6 million shares under the 2019 Share Repurchase Program for $100 million. No shares were repurchased under the 2019 Share Repurchase Program in the second, third or fourth quarter of 2020. See discussion under “Liquidity and Capital Resources—Share Repurchase Programs,” below, for further information.
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Items Affecting Comparability of Results
In addition to the impact of market conditions discussed above, certain items impacted our financial results during the years ended December 31, 2020 and 2019. The following table and related discussion outline these items and how they impacted the comparability of our financial results during these periods. Positive amounts in the table below are costs or expenses incurred, while negative amounts are income recognized in the periods presented. During the years ended December 31, 2020 and 2019, we reported net earnings attributable to common stockholders of $1.19$317 million and $493 million, respectively.
20202019
Pre-Tax
After-Tax(1)
Pre-Tax
After-Tax(1)
(in millions)
Unrealized net mark-to-market (gain) loss on natural gas derivatives(2)
$(6)$(5)$14 $10 
COVID impacts:
Special COVID-19 bonus for operational workforce(2)
19 15 — —��
Turnaround deferral(2)
— — 
Loss (gain) on foreign currency transactions, including intercompany loans(3)
(1)(1)
Engineering cost write-off(3)
— — 
Loss on sale of surplus land(3)
— — 
Insurance proceeds(3)
(37)(28)(37)(28)
Gain on sale of Pine Bend facility(3)
— — (45)(34)
Losses on debt extinguishment— — 21 16 
Louisiana incentive tax credit(4)
— — — (30)
Terra amended tax returns—interest income and income tax benefit(5)
(26)(44)(5)(14)
PLNL withholding tax charge(6)
— — 16 16 

(1)    The tax impact is calculated utilizing a marginal effective rate of 23.2% in 2016, or2020 and 23.3% in 2019.
(2)    Included in cost of sales in our consolidated statements of operations.
(3)    Included in other operating—net in our consolidated statements of operations.
(4)    Included in income tax provision in our consolidated statements of operations.
(5)    Included in interest expense, interest income and income tax provision in our consolidated statements of operations.
(6)    Included in equity in earnings (loss) of operating affiliate in our consolidated statements of operations.
The following describes the significant items that impacted the comparability of our financial results in 2020 and 2019. Descriptions of items below that refer to amounts in the table above, refer to the pre-tax amounts, except for the discussion under Income taxes.
Unrealized net mark-to-market (gain) loss on natural gas derivatives
Natural gas is the largest and most volatile single component of the manufacturing cost for nitrogen-based products. At certain times, we have managed the risk of changes in natural gas prices through the use of derivative financial instruments. The derivatives that we may use for this purpose are primarily natural gas fixed price swaps, basis swaps and options. We use natural gas derivatives as an increaseeconomic hedge of $2.72 per share.natural gas price risk, but without the application of hedge accounting. This can result in volatility in reported earnings due to the unrealized mark-to-market adjustments that occur from changes in the value of the derivatives, which is reflected in cost of sales in our consolidated statements of operations. In 2020 and 2019, we recognized an unrealized net mark-to-market (gain) loss on natural gas derivatives of $(6) million and $14 million, respectively.
COVID impacts
In March 2020, a short-term bonus program was initiated to compensate operational employees for continuing their critical tasks at the beginning of the COVID-19 pandemic. The impactbonus program concluded in June 2020. Approximately $19 million was paid as part of Tax Reform added $2.10 to diluted earnings per sharethe program and was recognized in 2017. cost of sales in our consolidated statement of operations for the year ended December 31, 2020.
(Loss) earnings before income taxesIn addition, certain plant turnaround activities were deferred because of the COVID-19 pandemic. As a result, we incurred $7 million of expense for the year ended December 31, 2020, which was recognized in cost of sales in our consolidated statement of operations.
Earnings before income taxes increased by $101 million to
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Loss (gain) on foreign currency transactions, including intercompany loans
In 2020 and 2019, we recognized a loss (gain) of $125 million in 2017 from a loss of $226 million in 2016. The increase in earnings before income taxes is due to a combination of the following three categories of items which are described below:
$617 million of charges that were recognized in 2016 that did not reoccur in 2017; partially offset by
$410 million reduction in gross margin from operations; and
$108 million increase in net interest expense.
Significant charges in 2016
In 2016, we recognized $617 million of certain significant charges from the following items:
Transaction costs of $179 million pertaining to our proposed combination with certain businesses of OCI (that was ultimately terminated in 2016) and costs associated with establishing our strategic venture with CHS.
An impairment charge of $134 million related to our investment in Point Lisas Nitrogen Limited.
We took actions in both 2016 and 2017 to make modifications to our outstanding debt in response to changes in market conditions.  Losses on debt extinguishments declined by $114 million as 2016 had losses of $167$5 million and 2017 had losses$(1) million, respectively, which consists of $53 million. 
Other operating expenses declined by $190 million in 2017 from an expense of $208 million in 2016 to an expense of $18 million in 2017. Other operating expenses are primarily pertaining to losses on foreign currency exchange rate impacts of the British pound and Canadian dollar on certain intercompany loans, certain costs pertaining to our capacity expansion projects and fair value adjustments for a derivative related to our strategic venture with CHS.
Gross margin from operations in 2017
As discussed earlier in "Overview of CF Holdings—Industry Factors and Items Affecting Comparability of Results," our operating results continue to be impacted by a surplus of capacity in the nitrogen industry, which has impacted product selling prices. Industry pricing conditions in 2017 declined early in the year to multi-year lows as oversupply conditions persisted, but selling prices rose as the year ended when supply and demand conditions were more in balance due to delays in the start-up of certain new industry capacity and stronger demand in certain regions. Our results in 2017 also included the full impact of all of our new capacity expansion plants. As a result, we set both production and sales volume records in 2017.
Our gross margin declined by $410 million in 2017 to $430 million from $840 million in 2016. The following major factors contributed to the decline in gross margin:
a higher unrealized net mark-to-market loss on natural gas derivatives, which decreased gross margin by $321 million as 2017 included a $61 million loss and 2016 included a $260 million gain,
a decrease in average selling prices of 5%, which reduced gross margin by $293 million,foreign currency denominated transactions, including the impact of changes in foreign currency exchange rates. rates on intercompany loans that were not permanently invested.
Engineering cost write-off
In June 2020, a project at one of our nitrogen complexes was cancelled and, as a result, $9 million of previously capitalized engineering costs were expensed in the year ended December 31, 2020. The expense is reflected in other operating—net in our consolidated statement of operations.
Loss on sale of surplus land
In 2020, we recognized a loss of $2 million on the sale of surplus land, which is reflected in other operating—net in our consolidated statement of operations.
Insurance proceeds
We recognized income of $37 million in both 2020 and 2019 related to insurance claims at one of our nitrogen complexes. The $37 million of income in 2020 consists of $35 million related to business interruption insurance proceeds and $2 million related to property insurance proceeds. The $37 million of income in 2019 consisted of $22 million related to business interruption insurance proceeds and $15 million related to property insurance proceeds. These proceeds are reflected in other operating—net in our consolidated statements of operations.
Gain on sale of Pine Bend facility
During the first quarter of 2019, we entered into an agreement to sell our Pine Bend dry bulk storage and logistics facility in Minnesota. In April of 2019, we completed the sale, received proceeds of $55 million and recognized a pre-tax gain of $45 million. The gain is reflected in other operating—net in our consolidated statement of operations.
Losses on debt extinguishment
On November 13, 2019, we redeemed in full all of the $500 million outstanding principal amount of the 7.125% senior notes due May 2020 (the 2020 Notes), in accordance with the optional redemption provisions provided in the indenture governing the 2020 Notes. On December 13, 2019, we redeemed $250 million principal amount, representing 50% of the $500 million outstanding principal amount immediately prior to such redemption, of the 3.400% senior secured notes due December 2021 (the 2021 Notes), in accordance with the optional redemption provisions provided in the indenture governing the 2021 Notes. As a result of the early redemption of the 2020 Notes and the 2021 Notes, we recognized a loss on debt extinguishment of $21 million, of which $12 million related to the 2020 Notes and $9 million related to the 2021 Notes.
Louisiana incentive tax credit
For 2019, our income tax provision included an incentive tax credit from the State of Louisiana of $30 million, net of federal income tax, related to certain capital projects at our Donaldsonville, Louisiana complex.
Terra amended tax returns
We completed the acquisition of Terra Industries Inc. (Terra) in April 2010. After the acquisition, we determined that the manner in which Terra reported the repatriation of cash from foreign affiliates to its U.S. parent for U.S. and foreign income tax purposes was not appropriate. As a result, in 2012 we amended certain tax returns, including Terra’s income and withholding tax returns, back to 1999 (the Amended Tax Returns) and paid additional income and withholding taxes, and related interest and penalties. In early 2013, the Internal Revenue Service (IRS) commenced an examination of the U.S. tax aspects of the Amended Tax Returns. In 2017, we also made a Voluntary Disclosure Filing with the average selling prices for ammonia, UANCanadian Revenue Agency (CRA) with respect to the Canadian tax aspects of this matter and granular urea declined by 13%, 11%,paid additional Canadian taxes due.
In early 2019, the IRS completed its examination of the Amended Tax Returns and 3%, respectively, whilesubmitted its audit reports and related refund claims to the average selling price for AN increased by 10%,
Joint Committee on Taxation of the U.S. Congress (the Joint Committee). For purposes of its review, the Joint Committee separated the IRS audit reports into two separate matters: (i) an increase in physical natural gas costs in 2017, partially offsetincome tax related matter and (ii) a withholding tax matter. In late 2019, we received notification that the Joint Committee had approved the IRS audit reports and related income tax refunds relating to the income tax related matter. As a result of the approval by the impact of natural gas derivatives that settledJoint Committee, we recognized in the period, which decreased gross margin by $162fourth quarter of 2019 interest income of $5 million as compared to 2016,($4 million after tax) and

a reduction in income tax
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the impactexpense of an increase in depreciation and amortization, excluding the impact from higher sales volume, of $160$10 million in 2017 as compared to 2016 due primarilyrelated to the completionfavorable settlement of certain uncertain tax positions. No income tax refunds were received in 2019 related to the Amended Tax Returns.
In 2020, we received notification that the Joint Committee approved the IRS audit report and start-uprelated withholding tax refunds relating to the withholding tax matter and we received IRS Notices indicating the amount of tax and interest to be refunded and received with respect to the withholding tax matter and the income tax matter. In addition, the CRA settled with us the Voluntary Disclosure matter.
In 2020, as a result of these events, we recognized $26 million of interest-related income and $18 million of income tax benefit, which consisted of the following:
additional income of $26 million ($23 million, net of tax) representing $16 million of interest income related to the U.S. Federal income tax matter and withholding tax matter and a $10 million reversal of previously accrued interest related to the Canadian tax aspects of this matter,
a reduction in our capacity expansion projects,liabilities for unrecognized tax benefits of $12 million with a corresponding reduction in income tax expense related to the U.S. Federal withholding tax matter, and
partially offset by an increaseadditional income tax benefit of $9 million related to the U.S. Federal income tax matter and related state amended returns.
In 2020, we received U.S. federal income tax refunds, including interest, of $110 million relating to the Amended Tax Returns, consisting of $68 million related to the income tax matter and $42 million related to the withholding tax matter, which finalized these matters with the IRS. As a result of the finalization of the income tax matter and the withholding tax matter, all U.S. federal tax years commencing before January 1, 2012 are now closed.
In the first quarter of 2021, we received approximately $20 million of withholding tax refunds, including interest, from the CRA, related to the Voluntary Disclosure Filing. These amounts were previously recorded in sales volumeour consolidated balance sheet as of 18%, which increased gross margin by $275 million, primarily driven by an increaseDecember 31, 2020.
PLNL withholding tax charge
The Trinidadian tax authority (the Board of Inland Revenue) issued a proposed tax assessment against PLNL, our joint venture in sales volume for ammoniathe Republic of Trinidad and granular urea of 43%Tobago, with respect to tax years 2011 and 21%, respectively,
targeted cost reduction initiatives and production efficiencies due to increased volume, and
start-up costs of $52 million in 2016 for the new ammonia plants at our Donaldsonville and Port Neal facilities.
Interest expensenet
Net interest expense increased by $108 million to $303 million in 2017 from $195 million in 2016. The increase is due primarily to a decrease2012 in the amount of approximately $12 million. The proposed assessment asserted that PLNL should have withheld tax at a higher rate on dividends paid to its Trinidadian owners. The Board of Inland Revenue also would have assessed statutory interest capitalized dueand penalties on the amount of tax owed when a final assessment was issued for the tax years 2011 and 2012.
During the third quarter of 2019, the Trinidadian government offered a tax amnesty period that provided taxpayers the opportunity to pay any prior year tax obligations and avoid accumulated interest or penalties. During the tax amnesty period, PLNL evaluated the proposed assessment, including considering the outcome of certain recent legal cases involving other taxpayers. As a result of this evaluation, in the third quarter of 2019, PLNL paid withholding tax to the completionBoard of Inland Revenue under the amnesty program for tax years back to 2011, and recognized a charge for $32 million. Our 50% share of PLNL’s tax charge is $16 million, which reduced our capacity expansion projectsequity in 2016.
Cash Position
Our cash and cash equivalents balance was $835 million at December 31, 2017, a declineearnings of $329 million from $1.16 billion at December 31, 2016. During 2017, our cash balance was significantly impacted by the following events, which are further described in "Liquidity and Capital Resources" below.
Receipt of a federal tax refund of $815 million due to the carryback of certain tax losses primarily arising from our capacity expansion projects
Early redemption and purchase of $1.1 billion in aggregate principal amount of certain senior notes due in 2018 and 2020

operating affiliate for 2019.
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Consolidated Results of Consolidated Operations
The following table presents our consolidated results of operations and supplemental data:
Year ended December 31, Year ended December 31,
2017 2016 2015 2017 v. 2016 2016 v. 2015 20202019
2018(1)
2020 v. 20192019 v. 2018
(in millions, except as noted) (in millions, except as noted)
Net sales$4,130
 $3,685
 $4,308
 $445
 12 % $(623) (14)%Net sales$4,124 $4,590 $4,429 $(466)(10)%$161 %
Cost of sales (COS)3,700
 2,845
 2,761
 855
 30 % 84
 3 %Cost of sales (COS)3,323 3,416 3,512 (93)(3)%(96)(3)%
Gross margin430
 840
 1,547
 (410) (49)% (707) (46)%Gross margin801 1,174 917 (373)(32)%257 28 %
Gross margin percentage10.4% 22.8% 35.9% (12.4)%   (13.1)%  Gross margin percentage19.4 %25.6 %20.7 %(6.2)%4.9 %
Selling, general and administrative expenses192
 174
 170
 18
 10 % 4
 2 %Selling, general and administrative expenses206 239 214 (33)(14)%25 12 %
Transaction costs
 179
 57
 (179) (100)% 122
 N/M
Other operating—net18
 208
 92
 (190) (91)% 116
 126 %Other operating—net(17)(73)(27)56 77 %(46)(170)%
Total other operating costs and expenses210
 561
 319
 (351) (63)% 242
 76 %Total other operating costs and expenses189 166 187 23 14 %(21)(11)%
Equity in earnings (losses) of operating affiliates9
 (145) (35) 154
 N/M
 (110) N/M
Equity in earnings (loss) of operating affiliateEquity in earnings (loss) of operating affiliate11 (5)36 16 N/M(41)N/M
Operating earnings229
 134
 1,193
 95
 71 % (1,059) (89)%Operating earnings623 1,003 766 (380)(38)%237 31 %
Interest expense—net303
 195
 131
 108
 55 % 64
 49 %Interest expense—net161 217 228 (56)(26)%(11)(5)%
Loss on debt extinguishment53
 167
 
 (114) (68)% 167
 N/M
Loss on debt extinguishment— 21 — (21)(100)%21 N/M
Other non-operating—net(2) (2) 4
 
  % (6) N/M
Other non-operating—net(1)(7)(9)86 %22 %
(Loss) earnings before income taxes and equity in earnings of non-operating affiliates(125) (226) 1,058
 101
 (45)% (1,284) N/M
Income tax (benefit) provision(575) (68) 396
 (507) N/M
 (464) N/M
Equity in earnings of non-operating affiliates—net of taxes
 
 72
 
  % (72) (100)%
Net earnings (loss)450
 (158) 734
 608
 N/M
 (892) N/M
Earnings before income taxesEarnings before income taxes463 772 547 (309)(40)%225 41 %
Income tax provisionIncome tax provision31 126 119 (95)(75)%%
Net earningsNet earnings432 646 428 (214)(33)%218 51 %
Less: Net earnings attributable to noncontrolling interests92
 119
 34
 (27) (23)% 85
 N/M
Less: Net earnings attributable to noncontrolling interests115 153 138 (38)(25)%15 11 %
Net earnings (loss) attributable to common stockholders$358
 $(277) $700
 $635
 N/M
 $(977) N/M
Diluted net earnings (loss) per share attributable to common stockholders$1.53
 $(1.19) $2.96
 $2.72
 N/M
 $(4.15) N/M
Net earnings attributable to common stockholdersNet earnings attributable to common stockholders$317 $493 $290 $(176)(36)%$203 70 %
Diluted net earnings per share attributable to common stockholdersDiluted net earnings per share attributable to common stockholders$1.47 $2.23 $1.24 $(0.76)(34)%$0.99 80 %
Diluted weighted-average common shares outstanding 233.9
 233.1
 236.1
 0.8
  % (3.0) (1)%Diluted weighted-average common shares outstanding215.2 221.6 233.8 (6.4)(3)%(12.2)(5)%
Dividends declared per common share$1.20
 $1.20
 $1.20
 $
  % $
  %Dividends declared per common share$1.20 $1.20 $1.20 $— — %$— — %
Natural Gas Supplemental Data (per MMBtu)             
Natural gas supplemental data (per MMBtu)Natural gas supplemental data (per MMBtu)
Natural gas costs in COS(1)(2)
$3.33
 $2.61
 $3.00
 $0.72
 28 % $(0.39) (13)%$2.21 $2.75 $3.15 $(0.54)(20)%$(0.40)(13)%
Realized derivatives loss in COS(2)
0.07
 0.46
 0.28
 (0.39) (85)% 0.18
 64 %
Realized derivatives loss (gain) in COS(3)
Realized derivatives loss (gain) in COS(3)
0.03 (0.01)0.01 0.04 N/M(0.02)N/M
Cost of natural gas in COS$3.40
 $3.07
 $3.28
 $0.33
 11 % $(0.21) (6)%Cost of natural gas in COS$2.24 $2.74 $3.16 $(0.50)(18)%$(0.42)(13)%
Average daily market price of natural gas Henry Hub (Louisiana)$2.96
 $2.48
 $2.61
 $0.48
 19 % $(0.13) (5)%Average daily market price of natural gas Henry Hub (Louisiana)$1.99 $2.51 $3.12 $(0.52)(21)%$(0.61)(20)%
Average daily market price of natural gas National Balancing Point (UK)(3)
$5.80
 $4.66
 $6.53
 $1.14
 25 % $(1.87) (29)%$3.20 $4.44 $8.07 $(1.24)(28)%$(3.63)(45)%
Unrealized net mark-to-market loss (gain) on natural gas derivatives$61
 $(260) $176
 $321
 N/M
 $(436) N/M
Unrealized net mark-to-market (gain) loss on natural gas derivativesUnrealized net mark-to-market (gain) loss on natural gas derivatives$(6)$14 $(13)$(20)N/M$27 N/M
Depreciation and amortization$883
 $678
 $480
 $205
 30 % $198
 41 %Depreciation and amortization$892 $875 $888 $17 %$(13)(1)%
Capital expenditures$473
 $2,211
 $2,469
 $(1,738) (79)% $(258) (10)%Capital expenditures$309 $404 $422 $(95)(24)%$(18)(4)%
Sales volume by product tons (000s)19,952
 16,957
 13,718
 2,995
 18 % 3,239
 24 %Sales volume by product tons (000s)20,296 19,538 19,329 758 %209 %
Production volume by product tons (000s):             Production volume by product tons (000s):
Ammonia(4)
10,295
 8,307
 7,673
 1,988
 24 % 634
 8 %
Ammonia(4)
10,353 10,246 9,805 107 %441 %
Granular urea4,451
 3,368
 2,520
 1,083
 32 % 848
 34 %Granular urea5,001 4,941 4,837 60 %104 %
UAN (32%)6,914
 6,698
 5,888
 216
 3 % 810
 14 %UAN (32%)6,677 6,768 6,903 (91)(1)%(135)(2)%
AN2,127
 1,845
 1,283
 282
 15 % 562
 44 %AN2,115 2,128 1,731 (13)(1)%397 23 %

N/M—Not Meaningful
(1)
Includes the cost of natural gas that is included in cost of sales during the period under the first-in, first-out inventory cost method.
(2)
Includes realized gains and losses on natural gas derivatives settled during the period. Excludes unrealized mark-to-market gains and losses on natural gas derivatives.
(3)
Amount represents average daily market price for the full year.
(4)
Gross ammonia production, including amounts subsequently upgraded on-site into granular urea, UAN, or AN.

(1)For a discussion and analysis of the year ended December 31, 2018, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations in our 2019 Annual Report on Form 10-K filed with the SEC on February 24, 2020.
(2)Includes the cost of natural gas and related transportation that is included in cost of sales during the period under the first-in, first-out inventory cost method.
(3)Includes realized gains and losses on natural gas derivatives settled during the period. Excludes unrealized mark-to-market gains and losses on natural gas derivatives.
(4)Gross ammonia production, including amounts subsequently upgraded on-site into granular urea, UAN, or AN.
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Year EndedThe following is a discussion and analysis of our consolidated results of operations for the year ended December 31, 2017 Compared2020 compared to Year Endedthe year ended December 31, 20162019. For a discussion and analysis of our consolidated results of operations for the year ended December 31, 2019 compared to the year ended December 31, 2018, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations in our 2019 Annual Report on Form 10-K filed with the SEC on February 24, 2020.
Net Sales
Our net sales are derived primarily from the sale of nitrogen fertilizersproducts and are determined by the quantities of fertilizersnitrogen products we sell and the selling prices we realize. The volumes, mix and selling prices we realize are determined to a great extent by a combination of global and regional supply and demand factors. Net sales also include shipping and handling costs that are billed to our customers. Sales incentives are reported as a reduction in net sales.
Our total net sales increased $445decreased $466 million, or 12%10%, to $4.13$4.12 billion in 20172020 compared to $3.69$4.59 billion in 20162019 due to an 18%a 14% decrease in average selling prices, which decreased net sales by $665 million, partially offset by a 4% increase in sales volume, which increased net sales by $738 million, partially offset by a 5% decrease in average selling prices, which reduced net sales by $293$199 million.
Average selling prices were $207$203 per ton in 20172020 compared to $217$235 per ton in 20162019, a decrease of 14%, due primarily to lower ammonia, UAN and granular urea average selling prices in 2017. Selling prices were negatively impactedacross all products, primarily driven by greaterincreased global nitrogen supply availability which continues to pressure selling prices globally. During the fourth quarter of 2017, certain announced nitrogen industry capacity additions that were expected to occur, were delayed, and certain maintenance outages all led to a favorable supply demand balance and contributed to a rise in nitrogen pricing.
as lower global energy costs drove higher global operating rates. The increase in total sales volume of 18%4% was due primarily to higher ammoniasales volume across all our products as greater supply availability resulting from both higher inventory levels entering 2020 and granular urea sales volumes, driven by increasedhigher production from the completion of our capacity expansion projects in December 2016.2020.
Cost of Sales
Our cost of sales includes manufacturing costs, purchased product costs, and distribution costs. Manufacturing costs, the most significant element of cost of sales, consist primarily of raw materials, realized and unrealized gains and losses on natural gas derivative instruments,derivatives, maintenance, direct labor, depreciation and other plant overhead expenses. Purchased product costs primarily include the cost to purchase nitrogen fertilizers to augment or replace production at our facilities. Distribution costs includeconsist of the cost of freight required to transport finished products from our plants to our distribution facilities, which are recognized in cost of sales when the product is sold to our customers, and storage costs incurred prior to final shipment to customers.
Our cost of sales increased $855decreased $93 million, or 30%3%, from 2016 to 2017.$3.32 billion in 2020 as compared to $3.42 billion in 2019. The increasedecrease in our cost of sales was due primarily due to the impact of higher sales volume, higher unrealized net mark-to-market losses on natural gas derivatives and higherlower realized natural gas costs, including the impact of realized derivatives, in addition to higher depreciation expenseand lower costs related to the completionplant maintenance activity. We recognized an unrealized net mark-to-market gain on natural gas derivatives of our capacity expansion projects and placing those assets into service.$6 million in 2020 compared to an unrealized net mark-to-market loss of $14 million in 2019. These increases to cost of salesfactors were partially offset by targetedan increase in cost reduction initiatives, production efficienciesof sales due to increased volumehigher sales volumes, higher distribution costs, and costs related to the special COVID-19 bonus. The special COVID-19 bonus is more fully described in 2017 and the absencesection above titled “Items Affecting Comparability of start-up costs of the new ammonia plant at our Donaldsonville facility and the new ammonia and urea plants at our Port Neal facility that occurred in 2016.Results—COVID impacts.” The cost of sales per ton averaged $185$164 in 2017,2020, a 10% increase6% decrease from $168$175 per ton in 2016. Cost of sales includes a $61 million unrealized net mark-to-market loss in 2017 compared to a $260 million unrealized net mark-to-market gain in 2016. Additionally, realized2019. Realized natural gas costs, including the impact of realized derivatives, increased 11% from $3.07decreased 18% to $2.24 per MMBtu in 2016 to $3.402020 from $2.74 per MMBtu in 2017.2019.
Selling, General and Administrative Expenses
Our selling, general and administrative expenses consist primarily of corporate office expenses such as salaries and other payroll-related costs for our executive, administrative, legal, financial, IT, and marketingsales functions, as well as certain taxes and insurance and other professional service fees, including those for corporate initiatives.
Selling, general and administrative expenses increased $18decreased $33 million, or 14%, to $192$206 million in 20172020 from $174$239 million in 2016.2019. The increasedecrease was due primarily to the combination of certainlower corporate office initiativesproject activity and higher incentive compensation due to improvements in operating performance.
Transaction Costs
Transaction costs consist of various consulting and legal services associated with the proposed combination with certain businesses of OCI that was terminated on May 22, 2016; our strategic venture with CHS, which began on February 1, 2016; and our July 31, 2015 acquisition of the remaining 50% equity interest in CF Fertilisers UK not previously owned by us.
In 2016, we incurred $179 million of transaction costs, including the $150 million termination fee paid to OCI in the second quarter of 2016travel as a result of the termination of the Combination Agreement and costs for various consulting and legal services.

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COVID-19 pandemic.
Other Operating—Net
Other operating—net includes administrative costs that do not relate directly to our central operations and costs associated with our capacity expansion projects.operations. Costs included in "other costs"“other operating costs” can include foreign exchange gains and losses, unrealized gains and losses on foreign currency derivatives, costs associated with our closed facilities, amounts recorded for environmental remediation for other areas of our business, litigation expenses and gains and losses on the disposal of fixed assets.
Other operating—net was $18$17 million of income in 2020 compared to $73 million of income in 2019. The income in 2020 includes insurance proceeds of $37 million. The insurance proceeds were partially offset by $9 million of expense in 2017 comparedrelated to $208the cancellation of a project, and foreign currency transaction losses of $5 million, of expense in 2016. The decreased expense was due primarily to a $93 million loss in 2016 fromwhich includes the impact of changes in foreign currency exchange rates on primarily British pound and Canadian dollar denominated intercompany loans that were not permanently invested. DueThe income in 2019 was due
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primarily to a restructuringthe gain recognized on the sale of certain intercompany loans, we did not incur the same levelPine Bend facility of $45 million and insurance proceeds of $37 million, partially offset by foreign exchange rate impactscurrency transaction losses. Each of these items is more fully described in 2017. The decreased expense is also due to expansion project expenses in 2016the section above titled “Items Affecting Comparability of $73 million, generally consisting of administrative and other project costs that did not qualify for capitalization, and a $23 million charge representing the net fair value adjustments to an embedded derivative related to our strategic venture with CHS. See Note 8—Fair Value Measurements for additional information.Results.”
Equity in Earnings (Losses)(Loss) of Operating AffiliatesAffiliate
Equity in earnings (losses)(loss) of operating affiliates primarilyaffiliate consists of our 50% ownership interest in PLNL. We include our share of the net earnings from our equity method investment in PLNL as an element of earnings from operations because this investment provides additional production and is integrated with our other supply chain and sales activities. Our share of the net earnings includes the amortization of certain tangible and intangible assets identified as part of the application of purchase accounting at acquisition. In 2016, equity in earnings (losses) of operating affiliates also includes impairment of our equity method investment in PLNL.
Equity in earnings (losses) of operating affiliatesaffiliate was $9$11 million of earnings in 20172020 compared to $145a loss of $5 million of losses in 2016. Earnings2019. The loss in 2017 includes a gain of $142019 included approximately $16 million related to the salea withholding tax charge recognized by PLNL regarding a multi-year tax dispute. See “Items Affecting Comparability of our interest in a joint venture that owns a carbon dioxide liquefaction and purification facility. In the fourth quarter of 2016, we recognized a $134 million impairment of our equity method investment in PLNL. ForResults—PLNL withholding tax charge,” above, for additional information regarding the impairment of our equity method investment in PLNL, see "Critical Accounting Policies and Estimates," below, and Note 7—Equity Method Investments.information.
Interest Expense—Net
Our interest expense—net includes the interest expense on our long-term debt, amortization of the related fees required to execute financing agreements, and annual fees pursuant to our Revolving Credit Agreement.revolving credit agreement and interest on tax liabilities. Capitalized interest relating to the construction of major capital projects reduces interest expense as the interest is capitalized and amortized over the estimated useful lives of the facility along with all other construction costs. Our interestrelated assets. Interest expense—net also includes interest income, which representsincludes amounts earned on our cash, cash equivalents, and investments.investments and any interest earned related to income tax refunds.
Net interest expense increaseddecreased by $108$56 million to $303$161 million in 20172020 from $195$217 million in 2015.2019. The $108 million increasedecrease was due primarily to a decreaseour redemption of $750 million aggregate principal amount of long-term debt in the fourth quarter of 2019, which is more fully described under “Liquidity and Capital Resources—Senior Notes,” below. In addition, the decrease reflects $26 million of income in 2020 related to the finalization of the Terra amended tax returns, which is more fully described under “Liquidity and Capital Resources—Terra Amended Tax Returns,” below.
Losses on Debt Extinguishment
On November 13, 2019, we redeemed in full all of the $500 million outstanding principal amount of interest capitalized due to the completion of our capacity expansion projects. In 2016, capitalized interest was $1662020 Notes, in accordance with the optional redemption provisions provided in the indenture governing the 2020 Notes. On December 13, 2019, we redeemed $250 million compared to $2 million in 2017. Net interest expense in 2016 also includes the amortization of capitalized bridge credit agreement fees of $28 million pertaining to the bridge loan for our proposed combination with certain businesses of OCI. Upon the terminationprincipal amount, representing 50% of the proposed combination with OCI, the unamortized portion of these fees was expensed.
During 2016, due$500 million outstanding principal amount immediately prior to the uncertain durationsuch redemption, of the prevailing low nitrogen fertilizer selling price environment and2021 Notes, in order to provide liquidity and covenant flexibility foraccordance with the future, we modifiedoptional redemption provisions provided in the Revolving Credit Agreement by reducing its size from $2.0 billion to $750 million and modifying certain covenants and other terms.indenture governing the 2021 Notes. As a result of these changes,the early redemption of the 2020 Notes and the 2021 Notes, we recognized $16 million of debt amendment fees and accelerated amortization of loan fees in interest expense in 2016.
Loss on Debt Extinguishment
Loss on debt extinguishment of $53 million in 2017 primarily consists of premiums paid for the early retirement of debt for the 2018 Notes and 2020 Notes. Loss on debt extinguishment of $167 million in 2016 consists of the make-whole payment, which resulted from our November 21, 2016 prepayment of the $1.0 billion aggregate principal amount of Private Senior Notes. Thea loss on debt extinguishment of $167$21 million, excludes $3of which $12 million (ofrelated to the $1702020 Notes and $9 million make-whole payment), which was accounted for as a modification and recognized on our consolidated balance sheet as deferred financing fees, a reduction of long-term debt, and is being amortized usingrelated to the effective interest rate method over the term of the Senior Secured2021 Notes.

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Income Tax (Benefit) Provision
Our income tax benefitprovision for 20172020 was $575$31 million on a pre-tax lossincome of $125$463 million, or an effective tax rate of 6.7% compared to an income tax benefitprovision of $68$126 million on a pre-tax lossincome of $226$772 million, or an effective tax rate of 16.3% in the prior year. The higher2019.
For 2020, our income tax provision includes a $27 million benefit in 2017 is due primarilyrelated to the impactsettlement of certain U.S. and foreign income tax audits, which primarily related to the settlement of the audit of the Terra amended tax returns, which is more fully described under “Liquidity and Capital Resources—Terra Amended Tax Act, which resulted inReturns,” below.
For 2019, our income tax provision includes an incentive tax credit from the State of Louisiana of $30 million, net of federal income tax, related to certain capital projects at our Donaldsonville, Louisiana complex, and an income tax benefit of $491$10 million recorded inrelated to the fourth quarterfavorable settlement of 2017, reflecting our best estimate ofcertain uncertain tax positions related to the impact of the Tax Act.Terra amended tax returns.
The primary impact of the Tax Act is the revaluation of all of our U.S. deferred tax balances, as result of the reduction of the U.S. statutory corporate tax rate from 35% to 21%, which resulted in an income tax benefit of $552 million that was recorded in 2017. This income tax benefit was partially offset by a tax charge and liability of $57 million, which represents our best estimate of the transition tax, or repatriation tax, on foreign earnings and profits, as described above under "Items Affecting Comparability—Tax Cuts and Jobs Act."
In addition, in both years, ourOur effective tax rate is impacted by earnings attributable to noncontrolling interests in CFN and TNCLP, as our consolidated income tax (benefit) provision does not include a tax provision on the earnings attributable to the noncontrolling interests. As a result, earnings attributable to the noncontrolling interests of $92 million and $119 million in 2017 and 2016, respectively, which are included in our pre-tax loss, impact the effective tax rate in both years. See Note 16—Noncontrolling Interests for additional information.
Due primarily to the $491 million income tax benefit from the Tax Act, we recognized a $575 million income tax benefit in 2017 on a pre-tax loss of $125 million. Our effective tax rate in 2017, exclusive of the tax benefit from the Tax Act and exclusive of the earnings attributable to the noncontrolling interests of $92 million from our pre-tax loss, results in an effective tax rate of 38.8%. Our effective tax rate in 2016, exclusive of the earnings attributable to the noncontrolling interests of $119 million from our pre-tax income, resulted in an effective tax rate of 19.6%. 
In the fourth quarter of 2016, we determined the carrying value of our equity method investment in PLNL exceeded fair value and recognized an impairment of our equity method investment in PLNL of $134 million, which is included in the equity in earnings of operating affiliates. Our 2016 income tax provision does not include a tax benefit for the impairment of our equity method investment as it will not give rise to a tax deduction, which reduced our 2016 effective tax rate.
Both 2017 and 2016 were impacted by additional discrete tax items. See Note 9—Income Taxes for additional information.
Net Earnings Attributable to Noncontrolling Interests
Net earnings attributable to noncontrolling interests includes the net earnings attributable to the 24.7% interest of the publicly-held common units of TNCLP. We own approximately 75.3% of TNCLP and outside investors own the remaining 24.7%. Net earnings attributable to noncontrolling interests also includes the net earnings attributable to the approximately 11% CHS minority equity interest in CFN, a subsidiary of CF Holdings, purchased for $2.8 billion on February 1, 2016.
Net earnings attributable to noncontrolling interests decreased $27 million in 2017 compared to 2016 due primarily to lower earnings from both CFN and TNCLP as both were impacted by lower average selling prices due to greater global nitrogen supply availability due to global capacity additions. The earnings of CFN were also impacted by higher natural gas prices and the impact of higher depreciation as a result of the completion of our capacity expansion projects and placing those assets into service.
Diluted Net Earnings (Loss) Per Share Attributable to Common Stockholders
Diluted net earnings (loss) per share attributable to common stockholders, including the impact of Tax Reform, increased $2.72 to earnings of $1.53 per share in 2017 from a loss of $1.19 per share in 2016. This increase is due primarily to the impact of Tax Reform partially offset by lower gross margin primarily driven by an increase in unrealized net mark-to-market losses on natural gas derivatives, the impact of lower selling prices due to greater global nitrogen supply availability, higher realized natural gas costs, including the impact of realized derivatives, and higher depreciation expense.
Year Ended December 31, 2016 Compared to Year Ended December 31, 2015
Net Sales
Our total net sales decreased $623 million, or 14%, to $3.69 billion in 2016 compared to $4.31 billion in 2015. The impact of the CF Fertilisers UK acquisition increased our net sales by $269 million, or 6%. The remaining decline in our net sales of $892 million, or 21%, was due to a 31% decline in average selling prices partially offset by a 14% increase in sales volume.

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Average selling prices, excluding the CF Fertilisers UK acquisition impact, were $218 per ton in 2016 compared to $318 per ton in 2015 due primarily to lower selling prices across all products. Selling prices were negatively impacted by excess global nitrogen supply. Pricing for nitrogen fertilizer products in the U.S. Gulf declined during most of 2016, often trading below parity with other international pricing points, as a result of continued imports from various exporting regions and decreased buyer interest. Seasonal decreases in agricultural demand combined with delayed customer purchasing activity resulted in multi-year lows in nitrogen fertilizer selling prices in the second half of the year.
Our total sales volume increased by 24% from 2015 to 2016. The impact of the CF Fertilisers UK acquisition increased our sales volume by 10%. The remaining increase in our sales volume of 14% was due primarily to greater granular urea and UAN volume available for sale due to our completed capacity expansion projects, partly offset by lower ammonia sales volume due to lower demand in North America during the fall application season. In addition, our ammonia sales volumes were lower in 2016 as we upgraded existing ammonia production as a result of our granular urea and UAN capacity expansion projects coming on line at our Donaldsonville, Louisiana complex.
Cost of Sales
Our cost of sales increased $84 million, or 3%, from 2015 to 2016. The overall increase in cost of sales is due primarily to the impact of the CF Fertilisers UK acquisition, which increased cost of sales by $251 million, or 9%, as 2016 includes a full year of CF Fertilisers UK results and 2015 includes five months of CF Fertilisers UK results. The remaining decrease in our cost of sales of $167 million, or 6%, was due primarily to the combination of unrealized net mark-to-market gains on natural gas derivatives and lower realized natural gas costs, partly offset by higher capacity expansion project related costs. Cost of sales includes a $260 million unrealized net mark-to-market gain in 2016 as compared to a $176 million unrealized net mark-to-market loss in 2015. Realized natural gas costs, including the impact of lower purchased natural gas costs and realized derivatives, declined 6% from $3.28 per MMBtu in 2015 to $3.07 per MMBtu in 2016 as natural gas prices were lower in 2016, particularly in the first half of the year with high storage levels and strong production in North America, although natural gas prices increased towards the end of 2016.
Capacity expansion project costs, including depreciation expense, which commenced once the respective expansion plant was placed in service, totaled $116 million in 2016. Start-up costs, which primarily relate to the cost of commencing production at the new ammonia plants for our Donaldsonville, Louisiana and Port Neal, Iowa plants, totaled $52 million in 2016.
Cost of goods sold per ton declined $33 per ton, or 16%, from $201 in 2015 to $168 in 2016, as a result of the factors noted above.
Selling, General and Administrative Expenses
Selling, general and administrative expenses increased $4 million to $174 million in 2016 from $170 million in 2015. The increase was due primarily to the impact of the CF Fertilisers UK acquisition, partly offset by lower costs for corporate office initiatives and lower intangible asset amortization expense.
Transaction Costs
In 2016, we incurred $179 million of transaction costs associated with the proposed combination with certain businesses of OCI and our strategic venture with CHS. This includes the $150 million termination fee paid by CF Holdings to OCI in the second quarter of 2016 as a result of the termination of the Combination Agreement and costs for various consulting and legal services. In 2015, we incurred $57 million of transaction costs associated with the proposed combination with certain businesses of OCI, our strategic venture with CHS and the acquisition of the remaining 50% equity interest in CF Fertilisers UK not previously owned by us.
Other Operating—Net
Other operating—net was $208 million in 2016 compared to $92 million in 2015. The increased expense was due primarily to $93 million of realized and unrealized losses on foreign currency transactions primarily related to British pound denominated intercompany debt that has not been permanently invested. In addition, the increased expense also reflects higher expansion project costs pertaining to our Donaldsonville, Louisiana and Port Neal, Iowa capacity expansion projects that did not qualify for capitalization and the loss of $23 million representing the net fair value adjustments to an embedded derivative related to our strategic venture with CHS. See Note 8—Fair Value Measurements for additional information. These increases were partly offset by a decrease in realized and unrealized losses on foreign currency derivatives of $22 million.

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Equity in (Losses) Earnings of Operating Affiliates
Equity in (losses) earnings of operating affiliates decreased by $110 million in 2016 as compared to 2015 due primarily to a $134 million impairment of our equity method investment in PLNL that was recognized in the fourth quarter of 2016. In the fourth quarter of 2015, we recognized a $62 million impairment of our equity method investment in PLNL. The remaining decrease was due primarily to lower operating results from PLNL, which included costs of $21 million that were incurred during 2016 related to a planned maintenance activity at the PLNL ammonia plant that resulted in the shutdown of the plant for approximately 45 days and the impact of lower ammonia selling prices in 2016 compared to 2015. For additional information regarding the impairment of our equity method investment in PLNL, see "Critical Accounting Policies and Estimates," below, and Note 7—Equity Method Investments.
Interest Expense—Net
Net interest expense increased by $64 million to $195 million in 2016 from $131 million in 2015. The $64 million increase in net interest expense was due primarily to the combination of higher debt levels due to the issuance of $1.0 billion of Private Senior Notes in September 2015 and debt amendment fees and accelerated amortization of debt issuance costs due to the restructuring of our debt and the Revolving Credit Agreement in 2016. Due to the uncertain duration of the prevailing low nitrogen fertilizer selling price environment and in order to provide liquidity and covenant flexibility for the future, we modified the Revolving Credit Agreement in 2016 by reducing its size from $2.0 billion to $750 million and modifying certain covenants and other terms. As a result of these changes, we recognized $16 million of debt amendment fees and accelerated amortization of loan fees in interest expense. The increase in interest expense—net in 2016 also includes the amortization of capitalized Bridge Credit Agreement fees of $28 million pertaining to the bridge loan for our proposed combination with certain of the OCI businesses. We also recorded capitalized interest of $166 million in 2016 related primarily to our capacity expansion projects compared to $154 million in 2015.
Loss on Debt Extinguishment
Loss on debt extinguishment of $167 million in 2016 consists of the make-whole payment, which resulted from our November 21, 2016 prepayment of the $1.0 billion aggregate principal amount of Private Senior Notes. This amount excludes $3 million (of the $170 million make-whole payment), which was accounted for as a modification and recognized on our consolidated balance sheet as deferred financing fees, a reduction of long-term debt, and is being amortized using the effective interest rate method over the term of the Senior Secured Notes.
Income Tax (Benefit) Provision
Our income tax benefit for 2016 was $68 million on a pre-tax loss of $226 million, resulting in an effective tax rate of 30.0%, compared to an income tax provision of $396 million on pre-tax income of $1.06 billion, or an effective tax rate of 37.4%, in the prior year.
State income taxes for 2016 were favorably impacted by investment tax credits of $13 million related to capital assets placed in service at our production facilities in Oklahoma that are indefinitely available to offset income taxes in that jurisdiction in future years. Our effective state income tax rate was also reduced as a result of the changes to our legal entity structure effected in the first quarter of 2016 as part of our strategic venture with CHS. See Note 16—Noncontrolling Interests for additional information.
State income taxes for 2016 includes a tax benefit of $46 million, net of federal tax effect, for state net operating loss carryforwards.
The income tax provision for 2016 includes the tax impact of the recaptured U.S. manufacturing profits deductions claimed in prior years that will not be deductible as a result of our intention to carryback the tax net operating loss for the year ended December 31, 2016 to those prior tax years.
Non-deductible capital costs for the tax year ended December 31, 2016 include certain transaction costs capitalized in the prior year that are now deductible as a result of the termination of the proposed combination with certain businesses of OCI.
Foreign subsidiaries of the Company have incurred capital losses of $109 million that are indefinitely available to offset capital gains in those foreign jurisdictions. As the future realization of these carryforwards is not anticipated, a valuation allowance of $28 million was recorded in 2016.
In the fourth quarters of 2016 and 2015, we determined the carrying value of our equity method investment in PLNL exceeded fair value and recognized an impairment of our equity method investment in PLNL of $134 million and $62 million,

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respectively, which is included in the equity in earnings of operating affiliates. Our respective income tax provisions do not include a tax benefit for the impairment of our equity method investment as it will not give rise to a tax deduction.
During the third quarter of 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK not previously owned by us and recognized a $94 million gain on the remeasurement to fair value of our initial 50% equity interest in CF Fertilisers UK. The earnings in CF Fertilisers UK have been permanently reinvested. Therefore, the recognition of the $94 million million gain on the remeasurement of the historical equity investment does not include the recognition of tax expense on the gain.
In addition, our effective tax rate is impacted by earnings attributable to noncontrolling interests in CFN and TNCLP, as our consolidated income tax provision does not include a tax provision on the earnings attributable to the noncontrolling interests. As a result,interest. Our effective tax rate for 2020 of 6.7%, which is based on pre-tax income of $463 million, would be 2.2 percentage points higher, or 8.9%, if based on pre-tax income exclusive of the earnings attributable to the noncontrolling interestsinterest of $119 million and $34 million in 2016 and 2015, respectively, which are included in (loss) earnings before income taxes and equity in earnings of non-operating affiliates, impact the$115 million. Our effective tax rate in both years. Earningsfor 2019 of 16.3%, which is based on pre-tax income of $772 million, would be 4.0 percentage points higher, or 20.3%, if based on pre-tax income exclusive of the earnings attributable to the noncontrolling interests increased in 2016 due to our strategic venture with CHS that commenced on February 1, 2016, at which time CHS purchased a minority equity interest in CFN.of $153 million.
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Both 2020 and 2019 were impacted by additional discrete tax items. See Note 16—Noncontrolling Interests for additional information.
See Note 9—10—Income Taxes for additional information.
Equity in Earnings of Non-Operating Affiliates—Net of Taxes
Equity in earnings of non-operating affiliates—net of taxes represents our share of the net earnings of the entities that we account for using the equity method and exclude from operating earnings. Equity in earnings of non-operating affiliatesnet of taxes in 2015 included the previously owned 50% equity method earnings of CF Fertilisers UK and also included our share of operating losses experienced at Keytrade. On July 31, 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK not previously owned by us for total consideration of $570 million, and CF Fertilisers UK became wholly owned by us and part of our consolidated financial results. We recorded a $94 million gain on the remeasurement to fair value of our initial 50% equity interest in CF Fertilisers UK in connection with the closing of the acquisition. Equity in earnings of non-operating affiliatesnet of taxes on 2015 also included our share of CF Fertilisers UK operating results up to the date of the acquisition. In addition, during the second quarter of 2015, we sold our interests in Keytrade and recorded an after-tax loss of $29 million (pre-tax loss of $40 million).
Net Earnings Attributable to Noncontrolling Interest
Net earnings attributable to noncontrolling interests increased $85 million in 2016 compared to 2015 due primarily tointerest includes the earnings attributable to the noncontrolling interest in CFN. This increase is partly offset by lower net earnings attributable to the approximately 24.7%11% CHS minority equity interest in CFN, a subsidiary of the publicly held common unitsCF Holdings.
Net earnings attributable to noncontrolling interest decreased $38 million, or 25%, to $115 million in 2020 compared to $153 million in 2019 due to lower earnings of TNCLP.CFN driven by lower average selling prices due primarily to increased global nitrogen supply availability.
Diluted Net Earnings (Loss) Per Share Attributable to Common Stockholders
Diluted net (loss)Net earnings per share attributable to common stockholders decreased $4.15$0.76 to a loss of $1.19$1.47 per diluted share in 20162020 from diluted net earnings$2.23 per share attributable to common stockholders of $2.96 perdiluted share in 2015.2019. This decrease is due primarily to lower net earnings.earnings, partially offset by the impact of a 3% reduction in diluted weighted-average common shares outstanding due to repurchases made under our share repurchase program. See discussion under “Liquidity and Capital Resources—Share Repurchase Program,” below, for further information.


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Operating Results by Business Segment
Our reportable segment structure reflects how our chief operating decision maker, as defined in the accounting principles generally accepted in the United States (U.S. GAAP), assesses the performance of our reportable segments and makes decisions about resource allocation. These segments are differentiated by products. Our management uses gross margin to evaluate segment performance and allocate resources. Total other operating costs and expenses (consisting of selling, general and administrative expenses and other operating—net) and non-operating expenses (interest and income taxes), are centrally managed and are not included in the measurement of segment profitability reviewed by management.
The following table presents summary operating results by business segment:
Ammonia
Granular Urea(1)
UAN(1)
AN(1)
Other(1)
Consolidated
Ammonia 
Granular Urea(1)
 
UAN(1)
 
AN(1)
 
Other(1)
 Consolidated (in millions)
(in millions, except percentages)
Year ended December 31, 2017        

  
Year ended December 31, 2020Year ended December 31, 2020
Net sales$1,209
 $971
 $1,134
 $497
 $319
 $4,130
Net sales$1,020 $1,248 $1,063 $455 $338 $4,124 
Cost of sales1,071
 856
 1,055
 446
 272
 3,700
Cost of sales850 847 949 390 287 3,323 
Gross margin$138
 $115
 $79
 $51
 $47
 $430
Gross margin$170 $401 $114 $65 $51 $801 
Gross margin percentage11.4% 11.8% 7.0% 10.3% 14.7% 10.4%Gross margin percentage16.7 %32.1 %10.7 %14.3 %15.1 %19.4 %
Year ended December 31, 2016 
  
  
  
  
  
Year ended December 31, 2019Year ended December 31, 2019 
Net sales$981
 $831
 $1,196
 $411
 $266
 $3,685
Net sales$1,113 $1,342 $1,270 $506 $359 $4,590 
Cost of sales715
 584
 920
 409
 217
 2,845
Cost of sales878 861 981 399 297 3,416 
Gross margin$266
 $247
 $276
 $2
 $49
 $840
Gross margin$235 $481 $289 $107 $62 $1,174 
Gross margin percentage27.1% 29.7% 23.1% 0.5% 18.4% 22.8%Gross margin percentage21.1 %35.8 %22.8 %21.1 %17.3 %25.6 %
Year ended December 31, 2015 
  
  
  
  
  
Year ended December 31, 2018Year ended December 31, 2018 
Net sales$1,523
 $788
 $1,480
 $294
 $223
 $4,308
Net sales$1,028 $1,322 $1,234 $460 $385 $4,429 
Cost of sales884
 469
 955
 291
 162
 2,761
Cost of sales867 889 1,007 414 335 3,512 
Gross margin$639
 $319
 $525
 $3
 $61
 $1,547
Gross margin$161 $433 $227 $46 $50 $917 
Gross margin percentage42.0% 40.4% 35.5% 1.1% 27.2% 35.9%Gross margin percentage15.7 %32.8 %18.4 %10.0 %13.0 %20.7 %

(1)
The cost of ammonia that is upgraded into other products is transferred at cost into the upgraded product results.

(1)The cost of ammonia that is upgraded into other products is transferred at cost into the upgraded product results.
The following is a discussion and analysis of our operating results by business segment for the year ended December 31, 2020 compared to the year ended December 31, 2019. For a discussion and analysis of our operating results by business segment for the year ended December 31, 2019 compared to the year ended December 31, 2018, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations in our 2019 Annual Report on Form 10-K filed with the SEC on February 24, 2020.
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Ammonia Segment
Our ammonia segment produces anhydrous ammonia (ammonia), which is our most concentrated nitrogen fertilizer as itproduct. Ammonia contains 82% nitrogen.nitrogen and 18% hydrogen. The results of our ammonia segment consist of sales of ammonia to external customers. In addition, ammonia is the "basic"“basic” nitrogen product that we upgrade into other nitrogen products such as granular urea, UAN and AN. We produce ammonia at all of our nitrogen manufacturing complexes.
The following table presents summary operating data for our ammonia segment:
Year ended December 31, Year ended December 31,
2017 2016 
2015(2)
 2017 v. 2016 2016 v. 2015 2020201920182020 v. 20192019 v. 2018
(in millions, except as noted) (in millions, except as noted)
Net sales$1,209
 $981
 $1,523
 $228
 23 % $(542) (36)%Net sales$1,020 $1,113 $1,028 $(93)(8)%$85 %
Cost of sales1,071
 715
 884
 356
 50 % (169) (19)%Cost of sales850 878 867 (28)(3)%11 %
Gross margin$138
 $266
 $639
 $(128) (48)% $(373) (58)%Gross margin$170 $235 $161 $(65)(28)%$74 46 %
Gross margin percentage11.4% 27.1% 42.0% (15.7)%   (14.9)%  Gross margin percentage16.7 %21.1 %15.7 %(4.4)%5.4 %
Sales volume by product tons (000s)4,105
 2,874
 2,995
 1,231
 43 % (121) (4)%Sales volume by product tons (000s)3,767 3,516 3,135 251 %381 12 %
Sales volume by nutrient tons (000s)(1)
3,367
 2,358
 2,456
 1,009
 43 % (98) (4)%
Sales volume by nutrient tons (000s)(1)
3,090 2,884 2,571 206 %313 12 %
Average selling price per product ton$295
 $341
 $509
 $(46) (13)% $(168) (33)%Average selling price per product ton$271 $317 $328 $(46)(15)%$(11)(3)%
Average selling price per nutrient ton(1)
$359
 $416
 $620
 $(57) (14)% $(204) (33)%
Average selling price per nutrient ton(1)
$330 $386 $400 $(56)(15)%$(14)(4)%
Gross margin per product ton$34
 $93
 $213
 $(59) (63)% $(120) (56)%Gross margin per product ton$45 $67 $51 $(22)(33)%$16 31 %
Gross margin per nutrient ton(1)
$41
 $113
 $260
 $(72) (64)% $(147) (57)%
Gross margin per nutrient ton(1)
$55 $81 $63 $(26)(32)%$18 29 %
Depreciation and amortization$183
 $96
 $95
 $87
 91 % $1
 1 %Depreciation and amortization$176 $167 $155 $%$12 %
Unrealized net mark-to-market loss (gain) on natural gas derivatives$20
 $(85) $40
 $105
 N/M $(125) N/M
Unrealized net mark-to-market (gain) loss on natural gas derivativesUnrealized net mark-to-market (gain) loss on natural gas derivatives$(2)$$(4)$(6)N/M$N/M

N/M—Not Meaningful
(1)Ammonia represents 82% nitrogen content. Nutrient tons represent the tons of nitrogen within the product tons.
(1)
Ammonia represents 82% nitrogen content. Nutrient tons represent the tons of nitrogen within the product tons.
(2)
Includes CF Fertilisers UK results since July 31, 2015, the date of our acquisition of the remaining 50% equity interest not previously owned by us.
Year Ended December 31, 20172020 Compared to Year Ended December 31, 20162019
Net Sales. Net sales in theour ammonia segment increaseddecreased by $228$93 million, or 23%8%, to $1.21$1.02 billion in 20172020 from $981 million$1.11 billion in 20162019 due primarily to a 43% increase15% decrease in sales volumeaverage selling prices, partially offset by a 13%7% increase in sales volume. Average selling prices decreased to $271 per ton in 2020 compared to $317 per ton in 2019. The decrease in average selling prices. The increase in sales volumeprices was due to higher production from the completion of our capacity expansion projects in December 2016. Average selling prices declined due to greaterincreased global nitrogen supply availability as lower global energy costs drove higher global operating rates. Sales volume was higher in 2020 due to global capacity additions. Selling prices strengthened in the fourth quarter of 2017 rising approximately 3% compared to the prior year period.greater supply availability resulting from increased production and higher inventory levels entering 2020.
Cost of Sales. Cost of sales per ton in our ammonia segment averaged $261$226 per ton in 2017,2020, a 5% increase10% decrease from $248$250 per ton in 2016. The increase was2019, due primarily to higher unrealized net mark-to-market losses on natural gas derivatives, higher realized natural gas costs, including the impact of realized derivatives, in addition to higher depreciation as a result of the new ammonia plants at our Donaldsonville and Port Neal facilities, partially offset by the start-up costs for those plants in 2016 and production efficiencies realized in 2017 due to increased volume. Depreciation and amortization in our ammonia segment in 2017 was $45 per ton compared to $33 per ton in 2016.
Year Ended December 31, 2016 Compared to Year Ended December 31, 2015
Net Sales. Net sales in the ammonia segment decreased by $542 million, or 36%, to $981 million in 2016 from $1.52 billion in 2015 due primarily to a 33% decrease in average selling prices and a 4% decrease in sales volume. These results include the impact of the CF Fertilisers UK acquisition, which increased net sales by $26 million, or 2%. The remaining decrease in our ammonia net sales of $568 million, or 37%, was due primarily to lower average selling prices and sales volume. Selling prices declined due to excess global nitrogen supply. In addition, our selling prices reflect the impact of a higher proportion of export sales, the volumes of which increased as a result of the weak fall application season attributable to the combined impact of weather conditions and low crop prices on our customers' decisions related to applying fertilizer in the fall. Sales volume in 2016 declined due to the combination of the weak fall application season and the impact of upgrading additional ammonia production at our Donaldsonville facility into granular urea and UAN as a result of our capacity expansion projects coming on line at our Donaldsonville, Louisiana complex.

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Cost of Sales. Cost of sales per ton in our ammonia segment averaged $248 per ton in 2016, including the impact of the CF Fertilisers UK acquisition, which averaged $220 per ton. The remaining cost of sales per ton was $250 in 2016, a 16% decrease from the $296 per ton in 2015. The decrease was due primarily to the impact of unrealized net mark-to-market gains on natural gas derivatives in 2016 compared to losses in 2015 and to the impact of lower realized natural gas costs in 2016. This was partlyand lower costs related to plant maintenance activity, partially offset by capacity expansion project start-uphigher distribution costs.
Gross Margin.  Gross margin in our ammonia segment decreased by $65 million to $170 million in 2020 from $235 million in 2019, and our gross margin percentage was 16.7% in 2020 compared to 21.1% in 2019. The decrease in gross margin was due to a 15% decrease in average selling prices, which reduced gross margin by $170 million. This factor was partially offset by a decrease in realized natural gas costs, of $50which increased gross margin by $57 million, and ana 7% increase in expansion project depreciation assales volume, which increased gross margin by $29 million, a result$13 million net decrease in other manufacturing and distribution costs, and the impact of the new ammonia plants at our Donaldsonville and Port Neal facilities.a $2 million unrealized net mark-to-market gain on natural gas derivatives in 2020 compared to a $4 million loss in 2019.




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Granular Urea Segment
Our granular urea segment produces granular urea, which contains 46% nitrogen. Produced from ammonia and carbon dioxide, it has the highest nitrogen content of any of our solid nitrogen fertilizers. Granular urea is produced at our Courtright, Ontario; Donaldsonville, Louisiana; Medicine Hat, Alberta; and Port Neal, Iowa nitrogen complexes.
The following table presents summary operating data for our granular urea segment:
Year ended December 31, Year ended December 31,
2017 2016 2015 2017 v. 2016 2016 v. 2015 2020201920182020 v. 20192019 v. 2018
(in millions, except as noted) (in millions, except as noted)
Net sales$971
 $831
 $788
 $140
 17 % $43
 5 %Net sales$1,248 $1,342 $1,322 $(94)(7)%$20 %
Cost of sales856
 584
 469
 272
 47 % 115
 25 %Cost of sales847 861 889 (14)(2)%(28)(3)%
Gross margin$115
 $247
 $319
 $(132) (53)% $(72) (23)%Gross margin$401 $481 $433 $(80)(17)%$48 11 %
Gross margin percentage11.8% 29.7% 40.4% (17.9)%   (10.7)%  Gross margin percentage32.1 %35.8 %32.8 %(3.7)%3.0 %
Sales volume by product tons (000s)4,357
 3,597
 2,460
 760
 21 % 1,137
 46 %Sales volume by product tons (000s)5,148 4,849 4,898 299 %(49)(1)%
Sales volume by nutrient tons (000s)(1)
2,004
 1,654
 1,132
 350
 21 % 522
 46 %
Sales volume by nutrient tons (000s)(1)
2,368 2,231 2,253 137 %(22)(1)%
Average selling price per product ton$223
 $231
 $320
 $(8) (3)% $(89) (28)%Average selling price per product ton$242 $277 $270 $(35)(13)%$%
Average selling price per nutrient ton(1)
$485
 $502
 $696
 $(17) (3)% $(194) (28)%
Average selling price per nutrient ton(1)
$527 $602 $587 $(75)(12)%$15 %
Gross margin per product ton$26
 $69
 $129
 $(43) (62)% $(60) (47)%Gross margin per product ton$78 $99 $88 $(21)(21)%$11 13 %
Gross margin per nutrient ton(1)
$57
 $149
 $281
 $(92) (62)% $(132) (47)%
Gross margin per nutrient ton(1)
$169 $216 $192 $(47)(22)%$24 13 %
Depreciation and amortization$246
 $112
 $51
 $134
 120 % $61
 120 %Depreciation and amortization$270 $264 $276 $%$(12)(4)%
Unrealized net mark-to-market loss (gain) on natural gas derivatives$16
 $(67) $47
 $83
 N/M $(114) N/M
Unrealized net mark-to-market (gain) loss on natural gas derivativesUnrealized net mark-to-market (gain) loss on natural gas derivatives$(2)$$(4)$(6)N/M$N/M

N/M—Not Meaningful
(1)Granular urea represents 46% nitrogen content. Nutrient tons represent the tons of nitrogen within the product tons.
(1)
Granular urea represents 46% nitrogen content. Nutrient tons represent the tons of nitrogen within the product tons.
Year Ended December 31, 20172020 Compared to Year Ended December 31, 20162019
Net Sales. Net sales in theour granular urea segment increased by $140decreased $94 million, or 17%7%, to $971 million$1.25 billion in 20172020 compared to $831 million$1.34 billion in 20162019 due primarily to a 21% increase13% decrease in sales volumeaverage selling prices, partially offset by a 3%6% increase in sales volume. Average selling prices decreased to $242 per ton in 2020 compared to $277 per ton in 2019. The decrease in average selling prices.was due primarily to increased global nitrogen supply availability as lower global energy costs drove higher global operating rates. Sales volume was higher due primarily to increased production at our new Port Neal facility, which came on line in the fourth quarter of 2016. Average selling prices decreased to $223 per ton in 2017 compared to $231 per ton in 2016 due primarily to greater global nitrogen supply availability due to global capacity additions. Selling pricesresulting from higher inventory levels entering 2020 and increased production. In addition, North American demand strengthened in the fourth quarter of 2017 rising approximately 14% compared to the prior year period.2020 amid increasing crop prices and overall improved farm economics.
Cost of Sales. Cost of sales per ton in our granular urea segment averaged $197 in 2017, a 22% increase from the $162$164 per ton in 2016. The increase was due primarily to higher depreciation as a result of the new granular urea plant at our Port Neal facility,2020, an unrealized net mark-to-market loss on natural gas derivatives in 2017 compared to a gain in the comparable period of 2016 and higher realized natural gas costs, including the impact of realized derivatives. These increases in cost of sales were partially offset by the impact of production efficiencies due to increased volume. Depreciation and amortization in our granular urea segment in 2017 was $56 per ton compared to $318% decrease from $178 per ton in 2016.

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Year Ended December 31, 2016 Compared to Year Ended December 31, 2015
Net Sales. Net sales in the granular urea segment increased by $43 million, or 5%, to $831 million in 2016 compared to $788 million in 2015 due primarily to a 46% increase in sales volume partially offset by a 28% decrease in average selling prices. Sales volume was higher due to increased production available as a result of our expanded urea capacity at our Donaldsonville, Louisiana complex that came on line in November of 2015. Average selling prices decreased to $231 per ton in 2016 compared to $320 per ton in 2015 due primarily to excess global nitrogen supply weighing on global nitrogen fertilizer selling prices.
Cost of Sales. Cost of sales per ton in our granular urea segment averaged $162 in 2016, a 15% decrease from the $191 per ton in 2015. The decrease was2019, due primarily to the impact of lower realized natural gas costs and lower costs related to plant maintenance activity.
Gross Margin.  Gross margin in our granular urea segment decreased by $80 million to $401 million in 2020 from $481 million in 2019, and our gross margin percentage was 32.1% in 2020 compared to 35.8% in 2019. The decrease in gross margin was due to a 13% decrease in average selling prices, which decreased gross margin by $166 million. This factor was partially offset by a decrease in realized natural gas costs, which increased gross margin by $40 million, a $23 million net decrease in other manufacturing and distribution costs, a 6% increase in sales volume, which increased gross margin by $17 million, and the impact of a $2 million unrealized net mark-to-market gainsgain on natural gas derivatives in 20162020 compared to lossesa $4 million loss in 2015. This was partly offset by increased depreciation expense related to our expanded urea production at our Donaldsonville, Louisiana complex and $2 million2019.



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CF INDUSTRIES HOLDINGS, INC.


UAN Segment
Our UAN segment produces urea ammonium nitrate solution (UAN). UAN, a liquid fertilizer product with a nitrogen content that typically ranges from 28% to 32%, is produced by combining urea and ammonium nitrate. UAN is produced at our nitrogen complexes in Courtright, Ontario; Donaldsonville, Louisiana; Port Neal, Iowa; Verdigris, Oklahoma; Woodward, Oklahoma; and Yazoo City, Mississippi.
The following table presents summary operating data for our UAN segment:
Year ended December 31, Year ended December 31,
2017 2016 2015 2017 v. 2016 2016 v. 2015 2020201920182020 v. 20192019 v. 2018
(in millions, except as noted) (in millions, except as noted)
Net sales$1,134
 $1,196
 $1,480
 $(62) (5)% $(284) (19)%Net sales$1,063 $1,270 $1,234 $(207)(16)%$36 %
Cost of sales1,055
 920
 955
 135
 15 % (35) (4)%Cost of sales949 981 1,007 (32)(3)%(26)(3)%
Gross margin$79
 $276
 $525
 $(197) (71)% $(249) (47)%Gross margin$114 $289 $227 $(175)(61)%$62 27 %
Gross margin percentage7.0% 23.1% 35.5% (16.1)%   (12.4)%  Gross margin percentage10.7 %22.8 %18.4 %(12.1)%4.4 %
Sales volume by product tons (000s)7,093
 6,681
 5,865
 412
 6 % 816
 14 %Sales volume by product tons (000s)6,843 6,807 7,042 36 %(235)(3)%
Sales volume by nutrient tons (000s)(1)
2,242
 2,109
 1,854
 133
 6 % 255
 14 %
Sales volume by nutrient tons (000s)(1)
2,155 2,144 2,225 11 %(81)(4)%
Average selling price per product ton$160
 $179
 $252
 $(19) (11)% $(73) (29)%Average selling price per product ton$155 $187 $175 $(32)(17)%$12 %
Average selling price per nutrient ton(1)
$506
 $567
 $798
 $(61) (11)% $(231) (29)%
Average selling price per nutrient ton(1)
$493 $592 $555 $(99)(17)%$37 %
Gross margin per product ton$11
 $41
 $90
 $(30) (73)% $(49) (54)%Gross margin per product ton$17 $42 $32 $(25)(60)%$10 31 %
Gross margin per nutrient ton(1)
$35
 $131
 $283
 $(96) (73)% $(152) (54)%
Gross margin per nutrient ton(1)
$53 $135 $102 $(82)(61)%$33 32 %
Depreciation and amortization$265
 $247
 $192
 $18
 7 % $55
 29 %Depreciation and amortization$256 $251 $270 $%$(19)(7)%
Unrealized net mark-to-market loss (gain) on natural gas derivatives$19
 $(81) $73
 $100
 N/M $(154) N/M
Unrealized net mark-to-market (gain) loss on natural gas derivativesUnrealized net mark-to-market (gain) loss on natural gas derivatives$(2)$$(4)$(6)N/M$N/M

N/M—Not Meaningful
(1)UAN represents between 28% and 32% of nitrogen content, depending on the concentration specified by the customer. Nutrient tons represent the tons of nitrogen within the product tons.
(1)
UAN represents between 28% and 32% of nitrogen content, depending on the concentration specified by the customer. Nutrient tons represent the tons of nitrogen within the product tons.
Year Ended December 31, 20172020 Compared to Year Ended December 31, 20162019
Net Sales. Net sales in theour UAN segment decreased $62$207 million, or 5%16%, to $1.13$1.06 billion in 20172020 compared to $1.27 billion in 2019 due primarily to an 11%a 17% decrease in average selling prices, partially offset by a 6%1% increase in sales volume. Average selling prices decreased to $160$155 per ton in 20172020 compared to $179$187 per ton in 2016. UAN average selling prices were lower2019 due primarily to greaterincreased global nitrogen supply availability due toas lower global capacity additions. Selling prices strengthenedenergy costs drove higher global operating rates and increased imports into the United States as trade flows adjusted in the fourth quarter of 2017 rising approximately 1% comparedresponse to the prior year period. Our salesEuropean Union anti-dumping duties. Sales volume was higher due primarily to growth in our North American customer base and higher export sales.
Cost of Sales. Cost of sales per ton in our UAN segment averaged $149 in 2017, an 8% increase from the average of $138 per ton in 2016. The increase was due primarily to the impact of an unrealized net mark-to-market loss on natural gas

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derivatives in 2017 compared to a gain in 2016 and the impact of higher realized natural gas costs in 2017, including the impact of realized derivatives, partially offset by targeted cost reduction initiatives and production efficiencies due to increased volume. Depreciation and amortization in our UAN segmentapproximately 6.8 million tons in both 20172020 and 2016 was $37 per ton.2019.
Year Ended December 31, 2016 Compared to Year Ended December 31, 2015
Net Sales. Net sales in the UAN segment decreased $284 million, or 19%, to $1.20 billion in 2016 due primarily to a 29% decrease in average selling prices partially offset by a 14% increase in sales volume. Average selling prices decreased to $179 per ton in 2016 compared to $252 per ton in 2015. UAN selling prices were lower due to excess global nitrogen supply weighing on global nitrogen fertilizer selling prices. Increases in UAN exports at lower selling prices also negatively impacted our average selling price. Sales volume was higher due to increased production as a result of expanded UAN capacity at our Donaldsonville, Louisiana complex that came on line in the first quarter of 2016.
Cost of Sales. Cost of sales per ton in our UAN segment averaged $138 in 2016, a 15% decrease from the average of $162 per ton in 2015. The2020, a 5% decrease wasfrom $145 per ton in 2019, due primarily to the impact of unrealized net mark-to-market gains on natural gas derivatives in 2016 compared to losses in 2015 and the impact of lower realized natural gas costcosts.
Gross Margin.  Gross margin in 2016. Thisour UAN segment decreased by $175 million to $114 million in 2020 from $289 million in 2019, and our gross margin percentage was partly10.7% in 2020 compared to 22.8% in 2019. The decrease in gross margin was due to a 17% decrease in average selling prices, which decreased gross margin by $222 million, and a $27 million net increase in other manufacturing and distribution costs. These factors were partially offset by a decrease in realized natural gas costs, which increased depreciation expense relatedgross margin by $58 million, a 1% increase in sales volume, which increased gross margin by $10 million, and the impact of a $2 million unrealized net mark-to-market gain on natural gas derivatives in 2020 compared to the expanded UAN capacity at our Donaldsonville, Louisiana complex that came on linea $4 million loss in the first quarter2019.

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AN Segment
Our AN segment produces ammonium nitrate (AN). AN, is a nitrogen-based product withwhich has a nitrogen content between 29% and 35%., is produced by combining anhydrous ammonia and nitric acid. AN is used as nitrogen fertilizer and is also used by industrial customers for commercial explosives and blasting systems. AN is produced at our nitrogen complexes in Yazoo City, Mississippi and Ince and Billingham, United Kingdom.
The following table presents summary operating data for our AN segment:
Year ended December 31, Year ended December 31,
2017 2016 2015 2017 v. 2016 2016 v. 2015 2020201920182020 v. 20192019 v. 2018
(in millions, except as noted) (in millions, except as noted)
Net sales$497
 $411
 $294
 $86
 21 % $117
 40 %Net sales$455 $506 $460 $(51)(10)%$46 10 %
Cost of sales446
 409
 291
 37
 9 % 118
 41 %Cost of sales390 399 414 (9)(2)%(15)(4)%
Gross margin$51
 $2
 $3
 $49
 N/M
 $(1) (33)%Gross margin$65 $107 $46 $(42)(39)%$61 133 %
Gross margin percentage10.3% 0.5% 1.1% 9.8%   (0.6)%  Gross margin percentage14.3 %21.1 %10.0 %(6.8)%11.1 %
Sales volume by product tons (000s)2,353
 2,151
 1,290
 202
 9 % 861
 67 %Sales volume by product tons (000s)2,216 2,109 2,002 107 %107 %
Sales volume by nutrient tons (000s)(1)
793
 726
 437
 67
 9 % 289
 66 %
Sales volume by nutrient tons (000s)(1)
747 708 676 39 %32 %
Average selling price per product ton$211
 $191
 $228
 $20
 10 % $(37) (16)%Average selling price per product ton$205 $240 $230 $(35)(15)%$10 %
Average selling price per nutrient ton(1)
$627
 $566
 $673
 $61
 11 % $(107) (16)%
Average selling price per nutrient ton(1)
$609 $715 $680 $(106)(15)%$35 %
Gross margin per product ton$22
 $1
 $2
 $21
 N/M
 $(1) (50)%Gross margin per product ton$29 $51 $23 $(22)(43)%$28 122 %
Gross margin per nutrient ton(1)
$64
 $3
 $7
 $61
 N/M
 $(4) (57)%
Gross margin per nutrient ton(1)
$87 $151 $68 $(64)(42)%$83 122 %
Depreciation and amortization$85
 $93
 $66
 $(8) (9)% $27
 41 %Depreciation and amortization$100 $88 $85 $12 14 %$%
Unrealized net mark-to-market loss (gain) on natural gas derivatives$2
 $(10) $16
 $12
 N/M
 $(26) N/M
Unrealized net mark-to-market loss on natural gas derivativesUnrealized net mark-to-market loss on natural gas derivatives$— $$— $(1)(100)%$N/M

N/M—Not Meaningful
(1)AN represents between 29% and 35% of nitrogen content. Nutrient tons represent the tons of nitrogen within the product tons.
(1)
Nutrient tons represent the tons of nitrogen within the product tons.
(2)
Includes CF Fertilisers UK results since July 31, 2015, the date of our acquisition of the remaining 50% equity interest not previously owned by us.
Year Ended December 31, 20172020 Compared to Year Ended December 31, 20162019
Net Sales. Total netNet sales in our AN segment increased $86decreased $51 million, or 21%10%, to $497$455 million in 20172020 from $411$506 million in 20162019 due primarily to a 10% increase15% decrease in average realized selling prices, andpartially offset by a 9%5% increase in sales volume, due to the commencement of a new long-term supply arrangement and a strong summer sales campaign in the United Kingdom. The increase in average realizedvolume. Average selling prices is netdecreased to $205 per ton in 2020 compared to $240 per ton in 2019 due primarily to increased global nitrogen supply availability as lower global energy costs drove higher global operating rates. Sales volume increased due primarily to greater supply availability as a result of the unfavorable impact of foreign exchange rate changes between the U.S. dollar and the British pound, which reduced net sales by $14 million.higher inventory levels entering 2020.

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Cost of Sales. Total costCost of sales per ton in our AN segment averaged $189 in 2017, a 1% decrease from $190$176 per ton in 2016. The2020, a 7% decrease wasfrom $189 per ton in 2019, due primarily to the costs in 2016 related to the completion of the reconfiguration at our Yazoo City complex, the impact of foreign exchange rate changes between the U.S. dollar and the British pound, and plant outages in the prior year. These decreases in cost of sales were partially offset by higherlower realized natural gas costs and lower costs related to plant maintenance activity.
Gross Margin.  Gross margin in our AN segment decreased by $42 million to $65 million in 2020 from $107 million in 2019, and our gross margin percentage was 14.3% in 2020 compared to 21.1% in 2019. The decrease in gross margin was due to a 15% decrease in average selling prices, which decreased gross margin by $77 million. This factor was partially offset by a decrease in realized natural gas costs, which increased gross margin by $26 million, and a 5% increase in sales volume, which increased gross margin by $4 million, a $4 million net decrease in other manufacturing and distribution costs, and the impact of ana $1 million unrealized net mark-to-market loss on natural gas derivatives in 2017 compared to a gain in 2016.2019.
Year Ended December 31, 2016 Compared to Year Ended December 31, 2015
Net Sales. Total net sales in our AN segment increased $117 million, or 40%, to $411 million in 2016 from $294 million in 2015 due primarily to a 67% increase in sales volume partially offset by a 16% decrease in average selling prices. These results include the impact

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CF Fertilisers UK acquisition, which increased net sales by $164 million, or 56%. The remaining decrease in our AN net sales of $47 million, or 16%, was due primarily to lower average selling prices from excess global nitrogen supply weighing on global nitrogen fertilizer selling prices.INDUSTRIES HOLDINGS, INC.
Cost of Sales. Total cost of sales per ton in our AN segment averaged $190 in 2016 including the impact of the CF Fertilisers UK acquisition, which averaged $211 per ton. The remaining cost of sales per ton averaged $180 in 2016, a 20% decrease from 2015 due primarily to unrealized net mark-to-market gains on natural gas derivatives in 2016 compared to losses in 2015 and the impact of lower realized natural gas costs. This decrease also includes the impact of the purchase accounting inventory valuation step-up in 2015 arising out of the CF Fertilisers UK acquisition.

Other Segment
Our Other segment primarily includes the following products:
Diesel exhaust fluid (DEF) is an aqueous urea solution typically made with 32.5% or 50% high-purity urea and 67.5%the remainder deionized water.
Urea liquor is a liquid product that we sell in concentrations of 40%, 50% and 70% urea as a chemical intermediate.
Nitric acid is a nitrogen-based product with a nitrogen contentmineral acid that is used in the production of 22.2%.nitrate-based fertilizers, nylon precursors and other specialty chemicals.
Compound fertilizer products (NPKs) are solid granular fertilizer products for which the nutrient content is a combination of nitrogen, phosphorus and potassium.
The following table presents summary operating data for our Other segment:
Year ended December 31, Year ended December 31,
2017 2016 
2015(2)
 2017 v. 2016 2016 v. 2015 2020201920182020 v. 20192019 v. 2018
(in millions, except as noted) (in millions, except as noted)
Net sales$319
 $266
 $223
 $53
 20 % $43
 19 %Net sales$338 $359 $385 $(21)(6)%$(26)(7)%
Cost of sales272
 217
 162
 55
 25 % 55
 34 %Cost of sales287 297 335 (10)(3)%(38)(11)%
Gross margin$47
 $49
 $61
 $(2) (4)% $(12) (20)%Gross margin$51 $62 $50 $(11)(18)%$12 24 %
Gross margin percentage14.7% 18.4% 27.2% (3.7)%   (8.8)%  Gross margin percentage15.1 %17.3 %13.0 %(2.2)%4.3 %
Sales volume by product tons (000s)2,044
 1,654
 1,108
 390
 24 % 546
 49 %Sales volume by product tons (000s)2,322 2,257 2,252 65 %— %
Sales volume by nutrient tons (000s)(1)
397
 317
 215
 80
 25 % 102
 47 %
Sales volume by nutrient tons (000s)(1)
457 444 439 13 %%
Average selling price per product ton$156
 $161
 $202
 $(5) (3)% $(41) (20)%Average selling price per product ton$146 $159 $171 $(13)(8)%$(12)(7)%
Average selling price per nutrient ton(1)
$804
 $839
 $1,040
 $(35) (4)% $(201) (19)%
Average selling price per nutrient ton(1)
$740 $809 $877 $(69)(9)%$(68)(8)%
Gross margin per product ton$23
 $30
 $55
 $(7) (23)% $(25) (45)%Gross margin per product ton$22 $27 $22 $(5)(19)%$23 %
Gross margin per nutrient ton(1)
$118
 $155
 $283
 $(37) (24)% $(128) (45)%
Gross margin per nutrient ton(1)
$112 $140 $114 $(28)(20)%$26 23 %
Depreciation and amortization$57
 $46
 $35
 $11
 24 % $11
 31 %Depreciation and amortization$68 $72 $67 $(4)(6)%$%
Unrealized net mark-to-market loss (gain) on natural gas derivatives$4
 $(17) $
 $21
 N/M $(17) N/M
Unrealized net mark-to-market loss (gain) on natural gas derivatives$— $$(1)$(1)(100)%$N/M

N/M—Not Meaningful
(1)
Nutrient tons represent the tons of nitrogen within the product tons.
(2)
Includes CF Fertilisers UK results since July 31, 2015, the date of our acquisition of the remaining 50% equity interest not previously owned by us.

(1)Nutrient tons represent the tons of nitrogen within the product tons.
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Year Ended December 31, 20172020 Compared to Year Ended December 31, 20162019
Net Sales. Total net Net sales in our Other segment increased $53decreased $21 million, or 20%6%, to $319$338 million in 20172020 from $266$359 million in 20162019 due to a 24% increasean 8% decrease in sales volumeaverage selling prices, partially offset by a 3% increase in sales volume. Average selling prices decreased to $146 per ton in 2020 compared to $159 per ton in 2019. The decrease in average selling prices.prices was due primarily to increased global nitrogen supply availability as lower global energy costs drove higher global operating rates. The increase in our Other segment sales volume was due primarily to an increase inhigher DEF and NPK sales volume as demand in North America continued to grow. The decline in average selling prices is due to greater global nitrogen supply availability weighing on global nitrogen selling prices and the impact of foreign exchange rate changes between the U.S. dollar and the British pound, which reduced netvolumes, partially offset by lower nitric acid sales by $6 million.volume.
Cost of Sales. Cost of sales per ton in our Other segment averaged $133 in 2017, a 2% increase from $131$124 per ton in 2016,2020, a 6% decrease from $132 per ton in 2019, due primarily to the impact of lower realized natural gas costs.
Gross Margin.  Gross margin in our Other segment decreased by $11 million to $51 million in 2020 from $62 million in 2019, and our gross margin percentage was 15.1% in 2020 compared to 17.3% in 2019. The decrease in gross margin was due to an 8% decrease in average selling prices, which reduced gross margin by $30 million. This factor was partially offset by a decrease in realized natural gas costs, which increased gross margin by $14 million, a $3 million net decrease in other manufacturing and distribution costs, a 3% increase in sales volume including a shift in the mix of products sold within the segment, which increased gross margin by $1 million, and the impact of a $1 million unrealized net mark-to-market loss on natural gas derivatives in 2017 compared to a gain in the comparable period of 2016, partially offset by the impact of foreign exchange rate changes between the U.S. dollar and the British pound and the impact of production efficiencies due to increased volume.2019.
Year Ended December 31, 2016 Compared to Year Ended December 31, 2015
Net Sales. Total net sales in our Other segment increased $43 million, or 19%, to $266 million in 2016 from $223 million in 2015 due to a 49% increase in sales volume partially offset by a 20% decrease in average selling prices. These results include the impact of the CF Fertilisers UK acquisition, which increased net sales by $79 million, or 35%. The remaining decrease in our Other segment net sales of $36 million, or 16%, was due primarily to lower average selling prices due to excess global nitrogen supply weighing on global nitrogen fertilizer selling prices.
Cost of Sales. Cost of sales per ton in our Other segment averaged $131 in 2016, including the impact of the CF Fertilisers UK acquisition, which averaged $158 per ton. The remaining cost of sales per ton averaged $121 in 2016, an 18% decrease from the $147 per ton in 2015 due to the unrealized net mark-to-market gains on natural gas derivatives in 2016 and the impact of the purchase accounting inventory valuation step-up in 2015 arising out of the CF Fertilisers UK acquisition.



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Liquidity and Capital Resources
Our primary uses of cash are generally for operating costs, working capital, capital expenditures, debt service, investments, taxes, share repurchases and dividends. Our working capital requirements are affected by several factors, including demand for our products, selling prices, raw material costs, freight costs and seasonal factors inherent in the business. In addition, we may from time to time seek to retire or purchase our outstanding debt through cash purchases, in open market or privately negotiated transactions or otherwise. Such repurchases, if any, will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. The amounts involved may be material.
Generally, our primary source of cash is cash from operations, which includes cash generated by customer advances. We may also from time to time access the capital markets or engage in borrowings under our revolving credit agreements.agreement. Our cash from operations could be affected by various risks and uncertainties, including, but not limited to, the effects of the COVID-19 pandemic.
In March 2020, as the impact of the COVID-19 pandemic unfolded in many locations around the world, credit markets began to function less efficiently, causing concern about liquidity in credit markets generally. In response to this and out of an abundance of caution, we borrowed $500 million under our $750 million revolving credit agreement to ensure we maintained ample financial flexibility in light of the uncertainty in the global markets, including the financial credit markets. In April 2020, due to confidence in the functioning of the credit markets and strong nitrogen fertilizer business conditions, we repaid the $500 million of borrowings.
Our cash and cash equivalents balance was $683 million at December 31, 2020, an increase of $396 million from $287 million at December 31, 2019. At December 31, 2017,2020, we were in compliance with all applicable covenant requirements under our revolving credit agreement, senior notes and senior secured notes, and unused borrowing capacity under our revolving credit agreement was $750 million.
On February 17, 2021, we announced that our wholly owned subsidiary CF Industries elected to redeem in full the Revolving Credit Agreement and our senior notes.
Our cash and cash equivalents balance was $835entire outstanding $250 million at December 31, 2017, a decline of $329 million from $1.16 billion at December 31, 2016. During 2017, our cash balance was significantly impacted by the following events, which are further described below.
Receipt of a federal tax refund of $815 million due to the carryback of certain tax losses primarily arising from our capacity expansion projects
Early redemption and purchase of $1.1 billion in aggregate principal amount of certain senior notes3.400% Senior Secured Notes due in 2018 and 2020
Capacity Expansion Project and Receipt of Tax Refund From Tax Loss Carryback
In 2016, we completed capacity expansion projects at Donaldsonville, Louisiana and Port Neal, Iowa that were originally announced in 2012. These projects provided us with an increase of approximately 25% in production capacity and had a total capital cost of $5.2 billion. The completion of our capacity expansion projects has reduced what had been a substantial use of liquidity in recent years. See discussion under "Overview of CF Holdings—Items Affecting Comparability of Results—Depreciation and amortization," above, and "—Capital Spending," below, for further informationDecember 2021 (the 2021 Notes) on these projects.
A significant portion of the capital assets that were constructed as part of the capacity expansion projects qualified for bonus depreciation under the Protecting Americans from Tax Hikes Act of 2015 (the PATH Act). Under the provisions of the PATH Act, eligible capital additions are subject to 50% bonus depreciation in the year the asset is placed in service. We generated a substantial federal net operating loss in 2016, primarily as a result of the bonus depreciation deductions. In the second quarter of 2017, we received a federal tax refund of $815 million as a result of the claim to carry back the 2016 federal net operating loss to prior income tax years.
Early Redemption and Purchase of Senior Notes
On December 1, 2017, we redeemed all of the $800 million outstanding principal amount of the 6.875% senior notes due May 2018 (the 2018 Notes)March 20, 2021, in accordance with the optional redemption provisions provided in the indenture governing the 20182021 Notes. TheBased on market interest rates on February 12, 2021, we estimate that the total aggregate redemption price was approximately $817 million. On December 26, 2017, we purchased approximately $300 million aggregate principal amount offor the $800 million outstanding principal amount of the 7.125% senior notes due 2020 (the 2020 Notes) at a total purchase price of approximately $331 million. As a result of the early redemption of the 20182021 Notes and the purchase of the 2020 Notes, we recognized a loss on debt extinguishment of $53will be approximately $258 million, primarily consisting of $48 million of total premiums paid for the early retirement of debt for the 2018 Notes and 2020 Notes. See discussion under "Debt—Senior Notes—Senior Secured Notes," below, for further information.including accrued interest.
Cash Equivalents
Cash equivalents include highly liquid investments that are readily convertible to known amounts of cash with original maturities of three months or less. Under our short-term investment policy, we may invest our cash balances, either directly or through mutual funds, in several types of investment-grade securities, including notes and bonds issued by governmental entities or corporations. Securities issued by governmental entities include those issued directly by the U.S. and Canadian federal governments; those issued by state, local or other governmental entities; and those guaranteed by entities affiliated with governmental entities.

Share Repurchase Program
On February 13, 2019, the Board authorized the repurchase of up to $1 billion of CF Holdings common stock through December 31, 2021 (the 2019 Share Repurchase Program). Repurchases under the 2019 Share Repurchase Program may be made from time to time in the open market, through privately negotiated transactions, block transactions or otherwise. The manner, timing and amount of repurchases will be determined by our management based on the evaluation of market conditions, stock price, and other factors.
During the year ended December 31, 2019, we repurchased approximately 7.6 million shares of CF Holdings common stock under the 2019 Share Repurchase Program for $337 million. In June and December of 2019, we retired approximately 4.2 million and 3.4 million shares, respectively, that were repurchased under the 2019 Share Repurchase Program in 2019.
During the first quarter of 2020, we repurchased approximately 2.6 million shares of CF Holdings common stock under the 2019 Share Repurchase Program for $100 million and retired those shares in the second quarter of 2020. No shares were repurchased in the second, third or fourth quarter of 2020 under the 2019 Share Repurchase Program. At December 31, 2020, we held 102,843 shares of treasury stock.
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The following table summarizes the share repurchases under the 2019 Share Repurchase Program.
SharesAmounts
(in millions)
Shares repurchased in 2019:
First quarter1.5 $60 
Second quarter2.7 118 
Third quarter1.5 72 
Fourth quarter1.9 87 
Shares repurchased as of December 31, 20197.6 337 
Shares repurchased in 2020:
First quarter2.6 100 
Shares repurchased as of December 31, 202010.2 $437 
Capital Spending
We make capital expenditures to sustain our asset base, increase our capacity, improve plant efficiency and comply with various environmental, health and safety requirements. Capital expenditures totaled $473$309 million in 20172020 compared to $2.21 billion$404 million in 2016 with2019. The decrease in capital expenditures in 2020 was due primarily to actions take to defer certain non-essential capital project activity as a result of the decrease primarily due to completion in 2016 of our capacity expansion projects at Donaldsonville, Louisiana and Port Neal, Iowa. COVID-19 pandemic.
Capital expenditures in 2017 include approximately $110 million of payments to contractors and vendors for work completed on our capacity expansion projects in 2016.
Projected Capital Spending
Capital expenditures for new activity in 20182021 are estimated to be in the range of $400$450 million, which reflects a return to $450 million.a normal spending level and includes expenditures for our initial green ammonia project at our Donaldsonville complex. Planned capital expenditures are generally subject to change due to delays in regulatory approvals or permitting, unanticipated increases in cost, changes in scope and completion time, performance of third parties, delaydelays in the receipt of equipment, adverse weather, defects in materials and workmanship, labor or material shortages, transportation constraints, acceleration or delays in the timing of the work and other unforeseen difficulties.
Purchase All of Publicly Traded Common Units of TNCLP
On February 7, 2018, we announced that TNGP elected to exercise its right to purchase allthese factors may also be influenced or exacerbated by the direct or indirect impacts of the 4,612,562 publicly traded common units of TNCLP on April 2, 2018, for a cash purchase price of $84.033 per unit in accordance with the terms of TNCLP’s partnership agreement. The purchase price of all of the 4,612,562 publicly traded common units of TNCLP is approximately $390 million. Upon completion of the purchase, we will own 100 percent of the general and limited partnership interests of TNCLP. See Note 26—Subsequent Event for additional information.COVID-19 pandemic.
Government Policies
The policies or laws of governments around the world can result in the imposition of taxes, duties, tariffs or other restrictions or regulatory requirements on imports and exports of raw materials, finished goods or services from a particular country or region of the world. The policies and laws of governments can also impact the subsidization of natural gas prices, and subsidies or quotas applied to domestic producers or farmers. Due to the critical role that fertilizers play in food production, the construction and operation of fertilizer plants often are influenced by economic, political and social objectives. Additionally, the import or export of fertilizer can be subject to local taxes imposed by governments which can have the effect of either encouraging or discouraging import and export activity. The impact of changes in governmental policies or laws or the political or social objectives of a country could have a material impact on fertilizer demand and selling prices and therefore could impact our liquidity.
Ethanol Industry and the Renewable Fuel Standard
Corn used to produce ethanol accounts for approximately 38%35% of total U.S. corn demand. U.S. government policy, as expressed in the Renewable Fuel Standard (RFS), is a major determinant for the ethanol market. The RFS establishes minimum volumes of various types of renewable fuels, including ethanol, that must be included in the United States’ supply of fuel for transportation. In addition, the U.S. Congress, at various times, has proposed legislation to either reducemodify or eliminate the RFS. While past legislation proposing changes to the RFS has not been enacted into law, there can be no assurance that future legislation will not be enacted into law. Other factors that drive the ethanol market include the prices of ethanol, gasoline and corn. Lower gasoline prices and fewer aggregate miles, driven by increased automobile fuel efficiency or the continued expansion of electric vehicles, may put pressure on ethanol prices that could result in reduced profitability and lower production for the ethanol industry, whichindustry. This could impact the demand for corn and nitrogen fertilizer and, therefore, could impact our liquidity.

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Terra Amended Tax Returns
In 2020, we received income tax refunds, including interest, of $110 million relating to the settlement of IRS audits of amended tax returns that we had filed in 2012 related to prior tax years. See discussion under “Items Affecting Comparability—Terra Amended Tax Returns,” above, for further information.
Repatriation of Foreign Earnings and Income Taxes
We have operations in Canada, the United Kingdom and ana 50% interest in a joint venture in the Republic of Trinidad and Tobago. Historically, the estimated additional U.S. and foreign income taxes due upon repatriation of the earnings of these foreign operations to the U.S. were recognized in our consolidated financial statements as the earnings were recognized, unless the earnings were considered to be permanently reinvested based upon our then current plans. However, the cash payment of the income tax liabilities associated with repatriation of earnings from foreign operations occurred at the time of the repatriation. As a result, the recognition of income tax expense related to foreign earnings, as applicable, and the payment of taxes resulting from repatriation of those earnings could occur in different periods.
In light of changes made by the Tax Act, commencing with the 2018 tax year, the United States no longer taxes earnings of foreign subsidiaries even when such earnings are earned or repatriated to the United States, unless such earnings are subject to U.S. rules on passive income or certain anti-abuse provisions. Foreign subsidiary earnings may still be subject to withholding taxes when repatriated to the United States.
Cash balances held by our joint venture are maintained at sufficient levels to fund local operations as accumulated earnings are repatriated from the joint venture on a periodic basis.
As of December 31, 2017,2020, approximately $152$122 million of our consolidated cash and cash equivalents balance of $835$683 million was held primarily by our Canadian and United Kingdom subsidiaries. Historically, and for the current year, the cash balance held by the Canadian subsidiaries represented accumulated earnings of our foreign operations that were not considered to be permanently reinvested. As of December 31, 2017, as a result of the amounts accrued in the transition tax liability recorded as a result of the Tax Act,2020, we would not expect any additional cash tax cost to repatriate the Canadian and United Kingdom cash balances if we were to repatriate this cash in the future.future, other than foreign withholding tax.
Net Operating Loss and Capital Loss Carryforwards
As of December 31, 2018, we had net operating loss and capital loss carryforwards (collectively, the Tax Loss Carryforwards) of $271 million. These Tax Loss Carryforwards were available to reduce taxable income and thereby, reduce cash taxes in the United States and other tax jurisdictions in which they could be applied. As a result of the effective usage of certain of these Tax Loss Carryforwards to offset current cash taxes payable, there were no U.S. Federal Tax Loss Carryforwards remaining as of December 31, 2019. As a result, we paid income taxes of approximately $111 million in 2020, net of income tax refunds of approximately $90 million primarily related to the Terra Amended Tax Returns, which are more fully described above under “Items Affecting Comparability—Terra Amended Tax Returns.”
Debt
Revolving Credit Agreement
We haveOn December 5, 2019, CF Holdings and CF Industries entered into a senior secured revolving credit agreementFourth Amended and Restated Credit Agreement (the Revolving Credit Agreement) providing, which amended and restated our Third Amended and Restated Revolving Credit Agreement, as previously amended (referred to herein, as in effect from time to time, as the Prior Credit Agreement), that was scheduled to mature September 18, 2020. The Revolving Credit Agreement provides for a revolving credit facility of up to $750 million with a maturity of September 18, 2020.December 5, 2024. The Revolving Credit Agreement includes a letter of credit sub-limit of $125 million. Borrowings under the Revolving Credit Agreement may be used for working capital, capital expenditures, acquisitions, share repurchases and other general corporate purposes. CF Industries may designate as borrowers one or more wholly owned subsidiaries that are organized in the United States or any state thereof, or the District of Columbia.
Borrowings under the Revolving Credit Agreement may be denominated in U.S. dollars, Canadian dollars, euroeuros and British pounds, and bear interest at a per annum rate equal to an applicable eurocurrency rate or base rate plus, in either case, a specified margin, and the borrowersmargin. We are required to pay an undrawn commitment fee on the undrawn portion of the commitments under the Revolving Credit Agreement and customary letter of credit fees. The specified margin and the amount of the commitment fee depend on CF Holdings’ credit rating at the time.
CF Industries is the lead borrower under the Revolving Credit Agreement. The borrowers and guarantors under the Revolving Credit Agreement, which are currently comprised of CF Holdings, CF Industries and CF Holdings’ wholly owned subsidiaries CF Industries Enterprises, Inc.LLC (CFE) and, CF Industries Sales, LLC (CFS), CF USA Holdings, LLC (CF USA), and CF Industries Distribution Facilities, LLC (CFIDF), are referred to together herein as the Loan Parties. CF Holdings and CF Industries guaranteed the obligations of the Loan Parties under the Revolving Credit Agreement prior to the effectiveness of the November 2016 Credit Agreement Amendment, and, upon the effectiveness of the November 2016 Credit Agreement Amendment, CFE and CFS also became guarantors of the obligations of the Loan Parties under the Revolving Credit Agreement. Subject to specified
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exceptions, the Revolving Credit Agreement requires that each direct or indirect domestic subsidiary of CF Holdings that guarantees debt for borrowed money of any Loan Party in excess of $150 million become a guarantor under the Revolving Credit Agreement. Subject to specified exceptions, the Revolving Credit Agreement requires a grant of a first priority security interest in substantially all of the assets of the Loan Parties, including a pledge by CFSCF USA of its equity interests in CF Industries Nitrogen, LLC (CFN)CFN and mortgages over certain material fee-owned domestic real properties, to secure the obligations of the Loan Parties thereunder.
In addition to the obligations under the Revolving Credit Agreement, the Loan Parties also guarantee the obligations under any (i) letter of credit facilities, letter of credit reimbursement agreements, letters of credit, letters of guaranty, surety bonds or similar arrangements, in an aggregate amount up to $300 million and (ii) interest rate or other hedging arrangements and (iii) agreements to provide Automated Clearing House transactions, cash management services or foreign exchange facilities or other cash management arrangements in the ordinary course of business, in each case between CF Holdings or certain of its subsidiaries, on the one hand, and any person that is a lender or the administrative agent under the Revolving Credit Agreement or an affiliate of such person, on the other hand, that are designated by CF Industries as Secured Bilateral LC Facilities, Secured Swap Agreements or Secured SwapCash Management Agreements (each as defined in the Revolving Credit Agreement), as applicable, pursuant to the terms of the Revolving Credit Agreement (such additional obligations, the Additional

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Guaranteed Obligations).Agreement. Obligations under Secured Bilateral LC Facilities, in an aggregate amount up to $300 millionSecured Swap Agreements and obligations under Secured SwapCash Management Agreements are secured by the same security interest that secures the obligations under the Revolving Credit Agreement.
At any time that (i) no default or event of default exists under the Revolving Credit Agreement and related documentation and (ii) (a) CF Holdings attains an investment-grade rating as set forth in the Revolving Credit Agreement; (b) CF Industries’ senior secured notes due 2021 and senior secured notes due 2026, including all fees, expenses and other amounts due and payable thereunder, have been paid or defeased or (c) CF Industries’ senior secured notes due 2021 and senior secured notes due 2026 cease to be secured by the assets of the Loan Parties that secure obligations under the Revolving Credit Agreement, CF Industries will have the right to require that (a) the security interest securing obligations under the Revolving Credit Agreement be terminated and released and (b) each guarantor under the Revolving Credit Agreement other than CF Holdings be released from its obligations under the Revolving Credit Agreement and related documentation.
The Revolving Credit Agreement contains representations and warranties and affirmative and negative covenants customary for a financing of this type. Prior to the effectiveness of the November 2016 Credit Agreement Amendment, the Revolving Credit Agreement limited the ability of non-guarantor subsidiaries of CF Holdings to incur indebtedness and limited the ability of CF Holdings and its subsidiaries to grant liens, merge or consolidate with other entities and sell, lease or transfer all or substantially all of the assets of CF Holdings and its subsidiaries to another entity, in each case, subject to specified exceptions. The November 2016 Credit Agreement Amendment modified the negative covenants in the Revolving Credit Agreement to limit further the ability of CF Holdings and its subsidiaries to grant liens and add limitations on the ability of CF Holdings and its subsidiaries to incur debt, pay dividends, voluntarily prepay certain debt, make investments and dispose of assets, in each case, subject to specified exceptions (such further and additional limitations, the Additional Negative Covenants).
The financial covenants applicable to CF Holdings and its subsidiaries in the Revolving Credit Agreement (the New Financial Covenants):Agreement:
(i)restrict
(i)     require that the interest coverage ratio of total secured debt to EBITDA (as defined in the Revolving Credit Agreement) for the period of four consecutive fiscal quarters most recently ended to a maximum of 3.75:1.00,
(ii)require the ratio of EBITDA for the period of four consecutive fiscal quarters most recently ended to consolidated interest expense (as defined in the Revolving Credit Agreement) for the period of four consecutive fiscal quarters most recently ended to be a minimum of 1.20:1.00 for the fiscal quarters ending on or prior to December 31, 2018, and 1.50:1.00 thereafter, and
(iii)require the ratio of total debt to total capitalization as of the last day of any fiscal quarter to be less than or equal to 0.60:1.00.
Under the Revolving Credit Agreement, if on any date certain conditions were met, including (i) an absenceAgreement) be not less than 2.75:1.00 as of an eventthe last day of default undereach fiscal quarter and
(ii)     require that the total net leverage ratio (as defined in the Revolving Credit Agreement, (ii)Agreement) be not greater than 3.75:1.00 (the Maximum Total Net Leverage Ratio) as of the receiptlast day of an investment grade corporate rating foreach fiscal quarter, provided that, if any borrower or subsidiary consummates a material acquisition during any fiscal quarter, CF Holdings from two of three selected ratings agencies and (iii)Industries may elect to increase the ratio of CF Holdings’ total net debtMaximum Total Net Leverage Ratio to EBITDA4.25:1.00 for the period of four consecutive fiscal quarters most recently ended being less than 3.75:1.00, CF Industries wouldcommencing with such fiscal quarter (and no further such election may be able to, at its option, choose to (w) suspendmade unless and until the Additional Negative Covenants, (x) replace the New Financial Covenants with covenants requiring the ratio of total net debt to EBITDA for the period of four fiscal consecutive quarters most recently ended to beMaximum Total Net Leverage Ratio is less than or equal to 3.75:1.00 andas of the ratioend of EBITDA for the period of fourtwo consecutive fiscal quarters most recently ended to consolidated interest expense forafter the periodend of four consecutive fiscal quarters most recently ended to be not less than 2.75:1.00, (y) release the collateral securing the obligationssuch period).
As of December 31, 2020, we were in compliance with all covenants under the Revolving Credit Agreement and (z) release the guarantees supporting, and the collateral securing, the Secured Bilateral LC Facilities and the Secured Swap Agreements. Such a choice by CF Industries would commence a "Covenant Suspension Period" that would expire upon the Company's no longer having an investment grade corporate rating from two of three selected rating agencies. Upon the expiration of a Covenant Suspension Period, the Additional Negative Covenants and the New Financial Covenants would be reinstated, and the Loan Parties party to the Revolving Credit Agreement would be required to guarantee the Additional Guaranteed Obligations and grant a first priority security interest in substantially all of each Loan Party’s assets, including a pledge by CFS of its equity interests in CFN and mortgages over certain material fee-owned domestic real properties, subject to certain exceptions, to secure the obligations under the Revolving Credit Agreement, the Secured Bilateral LC Facilities and the Secured Swap Agreements.Agreement.
The Revolving Credit Agreement contains events of default (with notice requirements and cure periods, as applicable) customary for a financing of this type, including, but not limited to, non-payment of principal, interest or fees; inaccuracy of representations and warranties in any material respect; and failure to comply with specified covenants. Upon the occurrence and during the continuance of an event of default under the Revolving Credit Agreement and after any applicable cure period, subject to specified exceptions, the administrative agent may, and at the request of the requisite lenders is required to, accelerate the loans under the Revolving Credit Agreement or terminate the lenders’ commitments under the Revolving Credit Agreement.
In March 2020, we borrowed $500 million under the Revolving Credit Agreement to ensure we maintained ample financial flexibility in light of the uncertainty in the global markets, including the financial credit markets, caused by the COVID-19 pandemic. In April 2020, due to confidence in the functioning of the credit markets and strong nitrogen fertilizer business conditions, we repaid the $500 million of borrowings, which returned our unused borrowing capacity under the Revolving Credit Agreement to $750 million.
As of December 31, 2017,2020, we had excessunused borrowing capacity under the Revolving Credit Agreement of $695$750 million (net ofand no outstanding letters of credit of $55 million). Therecredit. In addition, there were no borrowings outstanding under the Revolving Credit Agreement as of December 31, 20172020 or December 31, 2016, or during 2017.2019. Maximum borrowings outstanding under the Revolving Credit Agreement during the year ended December 31, 20162020 were $150 million with a weighted-average annual interest rate of 1.85%.

$500 million. The
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The Revolving Credit Agreement contains representations and warranties and affirmative and negative covenants, including financial covenants. Asweighted-average annual interest rate of December 31, 2017, we were in compliance with all covenantsborrowings under the Revolving Credit Agreement.Agreement during 2020 was 2.05%. There were no borrowings under the Prior Credit Agreement or the Revolving Credit Agreement during 2019.
Letters of Credit
In addition to the letters of credit outstandingthat may be issued under the Revolving Credit Agreement, as described above, we have also entered into a bilateral agreement with capacity to issue letters of credit up to $75 million.$250 million (reflecting an increase of $105 million in December 2020). As of December 31, 2017,2020, approximately $72$125 million of letters of credit were outstanding under this agreement.
Senior Notes
Long-term debt presented on our consolidated balance sheets as of December 31, 20172020 and December 31, 20162019 consisted of the following Public Senior Notes (unsecured) and Senior Secured Notesdebt securities issued by CF Industries:
Effective Interest Rate December 31, 2017 December 31, 2016 Effective Interest RateDecember 31, 2020December 31, 2019
 Principal Outstanding 
Carrying Amount (1)
 Principal Outstanding 
Carrying Amount (1)
Principal Outstanding
Carrying Amount (1)
Principal Outstanding
Carrying Amount (1)
 (in millions) (in millions)
Public Senior Notes:        Public Senior Notes:
6.875% due May 20187.344% $
 $
 $800
 $795
7.125% due May 20207.529% 500
 496
 800
 791
3.450% due June 20233.562% 750
 746
 750
 745
3.450% due June 20233.562%$750 $748 $750 $747 
5.150% due March 20345.279% 750
 739
 750
 739
5.150% due March 20345.279%750 741 750 740 
4.950% due June 20435.031% 750
 741
 750
 741
4.950% due June 20435.031%750 742 750 742 
5.375% due March 20445.465% 750
 741
 750
 741
5.375% due March 20445.465%750 741 750 741 
Senior Secured Notes:        Senior Secured Notes:
3.400% due December 20213.782% 500
 493
 500
 491
3.400% due December 20213.782%250 249 250 248 
4.500% due December 20264.759% 750
 736
 750
 735
4.500% due December 20264.759%750 740 750 739 
Total long-term debt $4,750
 $4,692
 $5,850
 $5,778
Total long-term debt$4,000 $3,961 $4,000 $3,957 
Less: Current maturities of long-term debtLess: Current maturities of long-term debt250 249 — — 
Long-term debt, net of current maturitiesLong-term debt, net of current maturities$3,750 $3,712 $4,000 $3,957 

(1)
(1)Carrying amount is net of unamortized debt discount and deferred debt issuance costs. Total unamortized debt discount was $9 million and $10 million as of December 31, 2020 and 2019, respectively, and total deferred debt issuance costs were $30 million and $33 million as of December 31, 2020 and 2019, respectively.   
Carrying amount is net of unamortized debt discount and deferred debt issuance costs. Total unamortized debt discount was $12 million as of December 31, 2017 and December 31, 2016, and total deferred debt issuance costs were $46 million and $60 million as of December 31, 2017 and December 31, 2016, respectively. 
Public Senior Notes
On November 13, 2019, we redeemed in full all of the $500 million outstanding principal amount of the 7.125% senior notes due May 2020 (the 2020 Notes), in accordance with the optional redemption provisions in the indenture governing the 2020 Notes. The total aggregate redemption price, excluding accrued interest paid on the 2020 Notes in connection with the redemption, was approximately $512 million. As a result, we recognized a loss on debt extinguishment of $12 million, primarily consisting of premiums paid for the early retirement of debt for the 2020 Notes.
Under the indentures (including the applicable supplemental indentures) governing our senior notes due 2018, 2020, 2023, 2034, 2043 and 2044 identified in the table above (the Public Senior Notes), each series of Public Senior Notes is guaranteed by CF Holdings. From November 21, 2016 to November 13, 2019, the Public Senior Notes were guaranteed not only by CF Holdings, and, in connection with the effectiveness of the November 2016 amendment to our Revolving Credit Agreement, CF Holdings' whollybut also by certain 100% owned subsidiaries of CF Industries Enterprises, Inc. (CFE) and CF Industries Sales, LLC (CFS) became subsidiary guarantorsHoldings. The guarantee of the Public Senior Notes in the case of each of those subsidiaries was subject to automatic release upon specified events, including the release of such subsidiary’s guarantee of the 2020 Notes. On November 13, 2019, as a result of the release of all subsidiary guarantees of the 2020 Notes upon the retirement of, and satisfaction and discharge of the indenture governing, the 2020 Notes, all subsidiary guarantees of the Public Senior Notes were automatically released.
Interest on the Public Senior Notes is payable semiannually, and the Public Senior Notes are redeemable at our option, in whole at any time or in part from time to time, at specified make-whole redemption prices.
If a Change
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The indentures governing the Public Senior Notes contain covenants that limit, among other things, the ability of CF Holdings and its subsidiaries, including CF Industries, to incur liens on certain assets to secure debt, to engage in sale and leaseback transactions, to merge or consolidate with a Ratings Downgrade (as both terms are defined underother entities and to sell, lease or transfer all or substantially all of the assets of CF Holdings and its subsidiaries to another entity. Each of the indentures governing the Public Senior Notes)Notes provides for customary events of default, which include (subject in certain cases to customary grace and cure periods), among others, nonpayment of principal or interest on the applicable Public Senior Notes; failure to comply with other covenants or agreements under the indenture; certain defaults on other indebtedness; the failure of CF Holdings’ guarantee of the applicable Public Senior Notes to be enforceable; and specified events of bankruptcy or insolvency. Under each indenture governing the Public Senior Notes, in the case of an event of default arising from one of the specified events of bankruptcy or insolvency, the applicable Public Senior Notes would become due and payable immediately, and, in the case of any other event of default (other than an event of default related to CF Industries’ and CF Holdings’ reporting obligations), the trustee or the holders of at least 25% in aggregate principal amount of the applicable Public Senior Notes then outstanding may declare all of such Public Senior Notes to be due and payable immediately.
Under each of the indentures governing the Public Senior Notes, specified changes of control involving CF Holdings or CF Industries, wouldwhen accompanied by a ratings downgrade, as defined with respect to the applicable series of Public Senior Notes, constitute change of control repurchase events. Upon the occurrence of a change of control repurchase event with respect to a series of Public Senior Notes, unless CF Industries has exercised its option to redeem such Public Senior Notes, CF Industries will be required to offer to repurchase each series of Public Senior Notesthem at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest. In addition, ininterest, if any, to, but not including, the event that a subsidiarydate of CF Holdings, other than CF Industries, becomes a borrower or a guarantor under the Revolving Credit Agreement (or any renewal, replacement or refinancing thereof), such subsidiary would be required to become a guarantor of the Public Senior Notes, provided that such requirement will no longer apply with respect to the Public Senior Notes due 2023, 2034, 2043 and 2044 following the repayment of the Public Senior Notes due 2018 and 2020 or the subsidiaries of ours, other than CF Industries, otherwise becoming no longer subject to such a requirement to guarantee the Public Senior Notes due 2018 and 2020.
On December 1, 2017, we redeemed all of the $800 million outstanding principal amount of the 6.875% senior notes due May 2018 (the 2018 Notes) in accordance with the optional redemption provisions provided in the indenture governing the 2018 Notes. The total aggregate redemption price was approximately $817 million. On December 26, 2017, we purchased

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approximately $300 million aggregate principal amount of the $800 million outstanding principal amount of 7.125% senior notes due 2020 (the 2020 Notes). The aggregate purchase price was approximately $331 million. As a result of the early redemption of the 2018 Notes and the purchase of the 2020 Notes, we recognized a loss on debt extinguishment of $53 million, primarily consisting of $48 million of premiums paid for the early retirement of debt for the 2018 Notes and 2020 Notes.repurchase.
Senior Secured Notes
On November 21, 2016, CF Industries issued $500 million aggregate principal amount of 3.400% senior secured notes due 2021 (the 2021 Notes) and $750 million aggregate principal amount of 4.500% senior secured notes due 2026 (the 2026 Notes, and together with the 2021 Notes, the Senior Secured Notes). The net proceeds, after deducting discounts and offering expenses, from the issuance and sale of the Senior Secured Notes were approximately $1.23 billion. CF Industries used approximately $1.18 billion of the net proceeds for the prepayment (including payment of a make-whole amount of approximately $170On December 13, 2019, we redeemed $250 million and accrued interest) in full of the outstanding $1.0 billion aggregate principal amount of the senior notes 2022, 2025 and 2027 (Private Senior Notes) issued by2021 Notes in accordance with the optional redemption provisions in the indenture governing the 2021 Notes. The total aggregate redemption price, excluding accrued interest paid on the 2021 Notes redeemed in connection with the redemption, was approximately $257 million. As a result, we recognized a loss on debt extinguishment of $9 million, primarily consisting of premiums paid for the early retirement of debt for the 2021 Notes.
On February 17, 2021, we announced that CF Industries elected to redeem in full the entire outstanding $250 million principal amount of the 2021 Notes on September 24, 2015.March 20, 2021, in accordance with the optional redemption provisions provided in the indenture governing the 2021 Notes.
Interest on the Senior Secured Notes is payable semiannually, on December 1 and June 1 beginning on June 1, 2017, and the Senior Secured Notes are redeemable at our option, in whole at any time or in part from time to time, at specified make-whole redemption prices.
Under the terms of the applicable indenture, the Senior Secured Notes of each series are fully and unconditionally guaranteed on a senior secured basis, jointly and severally, by CF Holdings and each current and future domestic subsidiary of CF Holdings (other than CF Industries) that from time to time is a borrower, or guarantees indebtedness, under the Revolving Credit Agreement. The requirement for any subsidiary of CF Holdings to guarantee the Senior Secured Notes of a series will apply only until, and the subsidiary guarantees of the Senior Secured Notes of a series will be automatically released upon, the latest to occur of (a) CF Holdings having an investment grade corporate rating, with a stable or better outlook, from two of three selected ratings agencies and there being no default or event of default under the applicable Indenture, (b) the retirement, discharge or legal or covenant defeasanceindenture. The subsidiary guarantors of or satisfaction and discharge of the supplemental indenture governing, the Public Senior Notes due 2018 or the subsidiaries of CF Holdings (other than CF Industries) otherwise becoming no longer subject to the requirement, described in the second paragraph under "—Public Senior Notes," above, to guarantee the Public Senior Notes due 2018 and (c) the retirement, discharge or legal or covenant defeasance of, or satisfaction and discharge of the supplemental indenture governing, the Public Senior Notes due 2020 or the subsidiaries of CF Holdings (other than CF Industries) otherwise becoming no longer subject to the requirement, described in the second paragraph under "—Public Senior Notes," above, to guarantee the Public Senior Notes due 2020. In accordance with the applicable indenture, CFE and CFS, in addition to CF Holdings, guaranteed the Senior Secured Notes currently consist of each series upon the initial issuance of the Senior Secured Notes.CFE, CFS, CF USA and CFIDF.
Subject to certain exceptions, the obligations under each series of Senior Secured Notes and each guarantor’s related guarantee are secured by a first priority security interest in substantially all of the assets of CF Industries, CF Holdings and the subsidiary guarantors, including a pledge by CFSCF USA of its equity interests in CFN and mortgages over certain material fee-owned domestic real properties (the Collateral). The obligations under the Revolving Credit Agreement, together with certain letter of credit, cash management, hedging and similar obligations and future pari passu secured indebtedness, will beare secured by the Collateral on a pari passu basis with the Senior Secured Notes. The liens on the Collateral securing the obligations under the Senior Secured Notes of a series and the related guarantees will be automatically released and the covenant under the applicable indenture limiting dispositions of Collateral will no longer apply if on any date after the initial issuance of the Senior Secured Notes, CF Holdings has an investment grade corporate rating, with a stable or better outlook, from two of three selected ratings agencies and there is no default or event of default under the applicable indenture.
Under each of the indentures governing the Senior Secured Notes, specified changes of control involving CF Holdings or CF Industries, when accompanied by a ratings downgrade, as defined with respect to the applicable series of Senior Secured Notes, constitute change of control repurchase events. Upon the occurrence of a change of control repurchase event with respect
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to the 2021 Notes or the 2026 Notes, as applicable, unless CF Industries has exercised its option to redeem such Senior Secured Notes, CF Industries will be required to offer to repurchase them at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any, to, but not including, the date of repurchase.
The indentures governing the Senior Secured Notes contain covenants that limit, among other things, the ability of CF Holdings and its subsidiaries, including CF Industries, to incur liens on certain assets to secure debt, to engage in sale and leaseback transactions, to sell or transfer Collateral, to merge or consolidate with other entities and to sell, lease or transfer all or substantially all of the assets of CF Holdings and its subsidiaries to another entity. Each of the indentures governing the Senior Secured Notes provides for customary events of default, which include (subject in certain cases to customary grace and cure periods), among others, nonpayment of principal or interest on the applicable Senior Secured Notes; failure to comply with other covenants or agreements under the indenture; certain defaults on other indebtedness; the failure of CF Holdings'Holdings’ or certain subsidiaries’ guarantees of the applicable Senior Secured Notes to be enforceable; lack of validity or perfection of any lien

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securing the obligations under the Senior Secured Notes and the guarantees with respect to Collateral having an aggregate fair market value equal to or greater than a specified amount; and specified events of bankruptcy or insolvency. Under each indenture governing the Senior Secured Notes, in the case of an event of default arising from one of the specified events of bankruptcy or insolvency, the applicable Senior Secured Notes would become due and payable immediately, and, in the case of any other event of default (other than an event of default related to CF Industries'Industries’ and CF Holdings'Holdings’ reporting obligations), the trustee or the holders of at least 25% in aggregate principal amount of the applicable Senior Secured Notes then outstanding may declare all of such Senior Secured Notes to be due and payable immediately.
Private Senior Notes
The senior notes due 2022, 2025 and 2027 (the Private Senior Notes), issued by CF Industries on September 24, 2015, were governed by the terms of a note purchase agreement (as amended, including by an amendment effective September 7, 2016, the Note Purchase Agreement). The Private Senior Notes were guaranteed by CF Holdings. All obligations under the Note Purchase Agreement were unsecured.
On November 21, 2016, we prepaid in full the outstanding $1.0 billion aggregate principal amount of our Private Senior Notes. The prepayment of $1.18 billion included the payment of a make-whole amount of approximately $170 million and accrued interest. Loss on debt extinguishment of $167 million on our consolidated statements of operations excludes $3 million of the make-whole payment, which was accounted for as a modification and recognized on our consolidated balance sheet as deferred financing fees, a reduction of long-term debt, and is being amortized using the effective interest rate method over the term of the Senior Secured Notes.
Bridge Credit Agreement
On September 18, 2015, in connection with our proposed combination with certain businesses of OCI, CF Holdings and CF Industries entered into a senior unsecured 364-Day Bridge Credit Agreement (as amended, the Bridge Credit Agreement). Upon the termination of the Combination Agreement on May 22, 2016, the lenders’ commitments under the Bridge Credit Agreement terminated automatically. There were no borrowings under the Bridge Credit Agreement. See Note 12—Interest Expense for additional information.
Share Repurchase Programs
Our Board of Directors (the Board) authorized certain programs to repurchase shares of our common stock. Each of these programs permitted repurchases to be made from time to time in the open market, through privately-negotiated transactions, through block transactions or otherwise. Our management determined the manner, timing and amount of repurchases based on the evaluation of market conditions, stock price and other factors. On August 6, 2014, the Board authorized a program to repurchase up to $1 billion of the common stock of CF Holdings through December 31, 2016 (the 2014 Program). As of December 31, 2016, 15.9 million shares had been repurchased for an aggregate expenditure of $900 million. The remaining $100 million of share repurchase authorization under the 2014 Program expired on December 31, 2016. No share repurchase programs were authorized by the Board in 2017.
Forward Sales and Customer Advances
We offer our customers the opportunity to purchase products from us on a forward basis at prices and on delivery dates we propose. Therefore, our reported nitrogen fertilizer selling prices and margins may differ from market spot prices and margins available at the time of shipment.
Customer advances, which typically represent a portion of the contract's salescontract’s value, are received shortly after the contract is executed, with any remaining unpaid amount generally being collected by the time control transfers to the product is shipped,customer, thereby reducing or eliminating the accounts receivable related to such sales. Any cash payments received in advance from customers in connection with forward sales contracts are reflected on our consolidated balance sheets as a current liability until related orders are shippedcontrol transfers and revenue is recognized. As of December 31, 20172020 and 2016,2019, we had $89$130 million and $42$119 million, respectively, in customer advances on our consolidated balance sheets.
While customer advances are generally a significant source of liquidity, the level of forward sales contracts is affected by many factors including current market conditions and our customers'customers’ outlook of future market fundamentals. During periods of declining prices, such as the current environment, customers tend to delay purchasing fertilizer in anticipation that prices in the future will be lower than the current prices. If the level of sales under our forward sales programs were to decrease in the future, our cash received from customer advances would likely decrease and our accounts receivable balances would likely increase. Additionally, borrowing under the Revolving Credit Agreement could become necessary. Due to the volatility inherent in our business and changing customer expectations, we cannot estimate the amount of future forward sales activity.

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Under our forward sales programs, a customer may delay delivery of an order due to weather conditions or other factors. These delays generally subject the customer to potential charges for storage or may be grounds for termination of the contract by us. Such a delay in scheduled shipment or termination of a forward sales contract due to a customer'scustomer’s inability or unwillingness to perform may negatively impact our reported sales.
Natural Gas Prices
Natural gas is the principal raw material used to produce nitrogen fertilizers.products. We use natural gas both as a chemical feedstock and as a fuel to produce ammonia, granular urea, UAN, AN and other nitrogen products. Expenditures on natural gas representare a significant portion of our production costs. For example, natural gas costs, including realized gains and losses, comprisedrepresenting approximately 47%one-third of our total production costs in 2017.2020. As a result of these factors, natural gas prices have a significant impact on our operating expenses and can thus affect our liquidity.
We enter into agreements for a portion of our future natural gas supply and related transportation. As of December 31, 2020, our natural gas purchase agreements have terms that range from one to five years and a total minimum commitment of approximately $430 million, and our natural gas transportation agreements have terms that range from one to ten years and a total minimum commitment of approximately $180 million. Our minimum commitments to purchase and transport natural gas are based on prevailing market-based forward prices excluding reductions for plant maintenance and turnaround activities.
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Because most of our nitrogen fertilizer manufacturing facilities are located in the United States and Canada, the price of natural gas in North America directly impacts a substantial portion of our operating expenses. Due to increases in natural gas production resulting from the rise in production from shale gas formations, natural gas prices in North America have declined since 2008,in the last decade, but are subject to volatility. During 2017,2020, the daily closing price at the Henry Hub, the most heavily-traded natural gas pricing point in North America, reached a low of $2.44$1.34 per MMBtu on February 28, 2017September 22, 2020 and three consecutive days in October and a high of $3.65$3.08 per MMBtu on three consecutive days in January 2017.October 27, 2020. During the three-year period ended December 31, 2017,2020, the daily closing price at the Henry Hub reached a low of $1.49$1.34 per MMBtu on September 22, 2020 and three consecutive days in March 2016October 2020 and a high of $3.77$6.88 per MMBtu on December 8, 2016.January 4, 2018.
We also have manufacturing facilities located in the United Kingdom. These facilities are subject to fluctuations associated with the price of natural gas in Europe. The major natural gas trading point for the United Kingdom is the National Balancing Point (NBP). During 2017,2020, the daily closing price at NBP reached a low of $3.30$1.04 per MMBtu on June 15, 2017May 22, 2020 and a high of $9.00$7.71 per MMBtu on December 12, 2017.30, 2020. During the three-year period ended December 31, 2017,2020, the daily closing price at NBP reached a low of $2.80$1.04 per MMBtu on September 1, September 12 and September 14, 2016,May 22, 2020, and a high of $9.00$31.74 per MMBtu on December 12, 2017.March 2, 2018.
Natural gas costs in our cost of sales, including the impact of realized natural gas derivatives, increased 11%decreased 18% to $2.24 per MMBtu in 20172020 from 2016.$2.74 per MMBtu in 2019.
Derivative Financial Instruments
We may use derivative financial instruments to reduce our exposure to changes in prices for natural gas that will be purchased in the future. Natural gas is the largest and most volatile component of our manufacturing cost for nitrogen-based fertilizers.our nitrogen products. From time to time, we may also use derivative financial instruments to reduce our exposure to changes in foreign currency exchange rates. Because we use derivative instruments, volatilityVolatility in reported quarterly earnings can result from the unrealized mark-to-market adjustments in the value of the derivatives. In 2017, 20162020 and 2015,2019, we recognized an unrealized net mark-to-market losses (gains)(gain) loss on natural gas derivatives of $61 million, $(260)$(6) million and $176$14 million, respectively, which is reflected in cost of sales in our consolidated statements of operations.
Derivatives expose us to counterparties and the risks associated with their ability to meet the terms of the contracts. For derivatives that are in net asset positions, we are exposed to credit loss from nonperformance by the counterparties. We control our credit risk through the use of multiple counterparties that are multinational commercial banks, other major financial institutions or large energy companies, and in most cases, the use of International Swaps and Derivatives Association (ISDA) master netting arrangements. The ISDA agreements are master netting arrangements commonly used for over-the-counter (OTC) derivatives that mitigate exposure to counterparty credit risk, in part, by creating contractual rights of netting and setoff, the specifics of which vary from agreement to agreement.
The ISDA agreements tofor most of our derivative instruments contain credit-risk-related contingent features, such as cross default provisions and credit support thresholds. In the event of certain defaults or a credit ratings downgrade, our counterparty may request early termination and net settlement of certain derivative trades or may require us to collateralize derivatives in a net liability position. The Revolving Credit Agreement, at any time when it is secured, provides a cross collateral feature for those of our derivatives that are with counterparties that are party to, or affiliates of parties to, the Revolving Credit Agreement so that no separate collateral would be required for those counterparties in connection with such derivatives. In the event the Revolving Credit Agreement becomes unsecured, separate collateral could be required in connection with such derivatives.
As of December 31, 20172020 and 2016,2019, the aggregate fair value of the derivative instruments with credit-risk-related contingent features in net liability positions was $12$6 million and zero,$12 million, respectively, which also approximates the fair value of the maximum amount of additional collateral that would need to be posted or assets needed to settle the obligations if the credit-

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risk-relatedcredit-risk-related contingent features were triggered at the reporting dates. As of December 31, 2017 and 2016, we had2020, our open natural gas derivative contracts consisted of natural gas fixed price swaps and basis swaps for 35.934.1 million MMBtusMMBtus. As of December 31, 2019, contracts consisted of natural gas fixed price swaps, basis swaps and 183.0options for 41.1 million MMBtus, respectively.MMBtus. At both December 31, 20172020 and 2016,2019, we had no cash collateral on deposit with counterparties for derivative contracts. The credit support documents executed in connection with certain of our ISDA agreements generally provide us and our counterparties the right to set off collateral against amounts owing under the ISDA agreements upon the occurrence of a default or a specified termination event.
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Embedded Derivative Liability
Under the terms of our strategic venture with CHS, if our credit rating as determined by two of three specified credit rating agencies is below certain levels, we are required to make a non-refundable yearly payment of $5 million to CHS. Since 2016, our credit ratings werehave been below certain levels in 2016 and, 2017,as a result, we made aan annual payment of $5 million to CHS in the fourth quarter of each year. These payments will continue on a yearly basis until the earlier of the date that our credit rating is upgraded to or above certain levels by two of three specified credit rating agencies or February 1, 2026.
This obligation is recognized on our consolidated balance sheet as an As of December 31, 2020 and 2019, the embedded derivative liability was $18 million and its value is included in other liabilities.$20 million, respectively. See Note 16—Noncontrolling Interests9—Fair Value Measurements for additional information.
Defined Benefit Pension Plans
We contributed $82$45 million to our pension plans in 2017. The contributions in 2017 include a voluntary contribution of $59 million made in the second quarter of 2017.2020. We expect to contribute approximately $41$33 million to our pension plans in 2018.2021. In addition, we expect to contribute a total of approximately $66 million to our U.K. plans in the three-year period ending 2024, as agreed with the plans’ trustees.
Distributions on Noncontrolling Interest in CFN
The CFN Board of Managers approved semi-annual distribution payments duringfor the years ended December 31, 20172020, 2019 and 2016,2018, in accordance with the Second Amended and Restated Limited Liability Company Agreement of CFN,CFN’s limited liability company agreement, as follows:
Approved and paidDistribution Period
Distribution Amount
(in millions)
First quarter of 2018Six months ended December 31, 2017$49
Third quarter of 2017Six months ended June 30, 201759
First quarter of 2017Six months ended December 31, 201648
Third quarter of 2016February 1, 2016 to June 30, 201679

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Approved and paidDistribution PeriodDistribution Amount
(in millions)
First quarter of 2021Six months ended December 31, 2020$64 
Third quarter of 2020Six months ended June 30, 202086 
First quarter of 2020Six months ended December 31, 201988 
Third quarter of 2019Six months ended June 30, 2019100 
First quarter of 2019Six months ended December 31, 201886 
Third quarter of 2018Six months ended June 30, 201879 
Cash Flows
Operating Activities
Net cash provided by operating activities in 20172020 was $1.63 billion as compared to $617 million in 2016, an increase of $1,014 million. The increase was primarily due to working capital changes including the receipt of our $815 million income tax refund related to the claim to carry back the 2016 federal tax loss to prior income tax years. The increase in net cash provided by operating activities was also a result of entering 2017 with a lower level of customer advances than 2016 due to customer reluctance to enter into prepaid contracts in a declining fertilizer price environment. These increases were partially offset by higher contributions to our pension plans. In 2017, we contributed $82 million to our pension plans compared to $23 million in 2016.
Net cash provided by operating activities in 2016 was $617$1,231 million as compared to $1.21 billion$1,505 million in 2015,2019, a declinedecrease of $590$274 million. The decline resulteddecrease in cash flow from operations was due primarily fromto lower net earnings during 2016 due to lower selling prices from excess global nitrogen supply,and higher cash taxes paid, partially offset by lower amounts of cash used forfavorable changes in net working capital purposes. Lower working capital levels in accounts receivable and inventory, plus lower amountscapital. Cash paid for income taxes, and certainnet of refunds, was $111 million in 2020, compared to a net refund of $41 million in 2019. In 2020, we received income tax refunds, received in 2016, contributedincluding interest, of $110 million related to the reduction in cash used for working capital. Favorablefinalization of amended U.S. tax returns, which is further described above under Terra Amended Tax Returns. During 2020, net changes in working capital also included a greater proportion of sales paidcontributed $12 million to cash flow from operations, while in 2016 as compared to the prior year period as we entered 2016 with a lower level of customer advances than2019 net changes in 2015 due to customers’ hesitancy to enter into prepaid contracts in a declining fertilizer price environment.working capital reduced cash flow from operations by $112 million. The increased cash flow from working capital changes was primarily driven by inventories and accounts payable and accrued expenses.
Investing Activities
Net cash used in investing activities was $408$299 million in 20172020 compared to $2.18 billion$319 million in 2016. This $1.77 billion2019. During 2020, capital expenditures totaled $309 million compared to $404 million in 2019. The decrease isin capital expenditures in 2020 was due primarily to loweractions taken to defer certain non-essential capital expendituresproject activity as a result of the completion of our capacity expansion projects in Donaldsonville, Louisiana and Port Neal, Iowa at the end of 2016. During 2017, capital expenditures totaled $473 million compared to $2.21 billion in 2016. The $2.98 billion netCOVID-19 pandemic. Net cash used in investing activities in 20152019 included $2.47 billion in capital expendituresproceeds of $55 million related to the sale of our Pine Bend facility and the 2015 acquisition of the remaining 50% equity interest in CF Fertilisers UK not previously owned by us for a net cash payment of $552$15 million which was net of cash acquired of $18 million.related to property insurance proceeds received.
Financing Activities
Net cash used in financing activities was $1.56 billion$542 million in 20172020 compared to net$1,583 million in 2019. The decline in cash provided byused in financing activities of $2.44 billionwas due to cash used to redeem certain senior notes in 20162019 and $77 millionhigher share repurchase activity in 2015.2019. In 2017,2019, we paid $1.15 billion$769 million in connection with the early redemption of $800 million in aggregate principal amount of our 2018 Notes, the purchase of approximately $300 million in aggregate principal amount of our 2020 Notes pursuant to a tender offer and premiums paid for the early retirement of long-term debt. In 2016, CHS purchased a minority equity interest in CFN for $2.8 billion. In 2017 and 2016, we distributed $131 million and $119 million, respectively, to the noncontrolling interests in CFN and TNCLP. In 2015, we distributed $45 million to the noncontrolling interest in TNCLP. The increase in distributions to noncontrolling interests in 2016 compared to 2015 was due to the CHS strategic venture, which increased the distributions by $79 million, representing the distributions paid to CHS in the third quarter of 2016 for the distribution period ended June 30, 2016.
In 2016, we received proceeds of approximately $1.24 billion, net of discounts, from the issuance of the Senior Secured Notes which were used to fund the prepayment of the $1.0 billion of Private Senior Notes and the related make-whole paymentpartial redemption of $170 million.the 2021 Notes. In 2015,2020, we issued the Private Senior Notes and received proceedsspent $100 million to repurchase shares of approximately $1.0 billion. No share repurchases were made during 2017 and 2016common stock compared to cash used$370 million in 2019, which included approximately $33 million related to shares repurchased in late 2018 that were paid for share repurchases in 2015 of $556 million.

2019. Dividends paid on common stock in 2020 and 2019 were $258 million and $265 million, respectively. Distributions to noncontrolling interest totaled $174 million in 2020 as compared to $186 million in 2019.
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Contractual Obligations
The following is a summary of our contractual obligations as of December 31, 2017:
 2018 2019 2020 2021 2022 After 2022 Total
 (in millions)
Contractual Obligations 
  
  
  
  
  
  
Debt 
  
  
  
  
  
  
Long-term debt(1)
$
 $
 $500
 $500
 $
 $3,750
 $4,750
Interest payments on long-term debt(1)
230
 230
 211
 191
 176
 2,217
 3,255
Other Obligations 
  
  
  
  
  
  
Operating leases83
 77
 57
 47
 36
 76
 376
Equipment purchases and plant improvements107
 15
 
 
 
 
 122
Transportation(2)
11
 10
 4
 2
 
 
 27
Purchase obligations(3)(4)
661
 195
 45
 37
 30
 84
 1,052
Contributions to pension plans(5)
41
 
 
 
 
 
 41
Total(6)(7)(8)
$1,133
 $527
 $817
 $777
 $242
 $6,127
 $9,623

(1)
Based on debt balances before discounts, offering expenses and interest rates as of December 31, 2017.
(2)
Includes anticipated expenditures under certain contracts to transport finished product to and from our facilities. The majority of these arrangements allow for reductions in usage based on our actual operating rates. Amounts set forth in this table are based on projected normal operating rates and contracted or current spot prices, where applicable, as of December 31, 2017 and actual operating rates and prices may differ.
(3)
Includes minimum commitments to purchase and transport natural gas based on prevailing market-based forward prices as of December 31, 2017 excluding reductions for plant maintenance and turnaround activities. Purchase obligations do not include any amounts related to our natural gas derivatives. See Note 14—Derivative Financial Instruments for additional information.
(4)
Includes a commitment to purchase ammonia from PLNL at market-based prices under an agreement that expires in September 2018. The purchase commitment is $73 million based on market prices as of December 31, 2017. This agreement includes automatic consecutive one-year renewals, unless otherwise terminated by either party in advance. Assuming the agreement is not terminated by either party and based on market prices as of December 31, 2017, the annual commitment would be $97 million.
(5)
Represents the contributions we expect to make to our pension plans during 2018. Our pension funding policy is to contribute amounts sufficient to meet minimum legal funding requirements plus discretionary amounts that we may deem to be appropriate.
(6)
Excludes $151 million of unrecognized tax benefits, due to the uncertainty in the timing of potential tax payments, and the estimated transition tax liability of $57 million resulting from the enactment of the Tax Act. See Note 9—Income Taxes for additional information.
(7)
Excludes $15 million of environmental remediation liabilities due to the uncertainty in the timing of payments.
(8)
Excludes $5 million annual payments to CHS related to our embedded derivative due to uncertainty of future credit ratings, as this is only applicable until the earlier of the date that our credit rating is upgraded to or above certain levels by two of three specified credit rating agencies or February 1, 2026. See Note 8—Fair Value Measurements or Note 16—Noncontrolling Interests for additional information.
On April 2, 2018, TNGP will purchase all of the 4,612,562 publicly traded common units of TNCLP for approximately $390 million in the aggregate. See Note 26—Subsequent Event for additional information.

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Off-Balance Sheet Arrangements
We have operating leases for certain property and equipment under various noncancelable agreements, the most significant of which are rail car leases and barge tow charters for the transportation of our products. The rail car leases currently have minimum terms ranging from one to eleven years and the barge charter commitments range from one to seven years. We also have terminal and warehouse storage agreements for our distribution system, some of which contain minimum throughput requirements. The storage agreements contain minimum terms generally ranging from one to five years and commonly contain automatic annual renewal provisions thereafter unless canceled by either party. See Note 23—Leases for additional information.
We do not have any other off-balance sheet arrangements that have or are reasonably likely to have a material current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources.
Critical Accounting Policies and Estimates
Our discussion and analysis of our financial condition, results of operations, liquidity and capital resources is based upon our consolidated financial statements, which have been prepared in accordance with U.S. GAAP. U.S. GAAP requires that we select policies and make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates. We base our estimates on historical experience, technological assessment, opinions of appropriate outside experts, and the most recent information available to us. Actual results may differ from these estimates. Changes in estimates that may have a material impact on our results are discussed in the context of the underlying financial statements to which they relate. The following discussion presents information about our most critical accounting policies and estimates.
Revenue Recognition
We recognize revenue when title and risk of loss are transferred to the customer, which can be at the plant gate, a distribution facility, a supplier location or a customer destination. In some cases, application of this policy requires that we make certain assumptions or estimates regarding a component of revenue, discounts and allowances, rebates, or creditworthiness of some of our customers. We base our estimates on historical experience, and the most recent information available to us, which can change as market conditions change. Amounts related to shipping and handling that are billed to our customers in sales transactions are classified as sales in our consolidated statements of operations. Sales incentives are reported as a reduction in net sales.
Income Taxes
We recognize expenses, assets and liabilities for income taxes based on estimates of amounts that ultimately will be determined to be taxable or deductible in tax returns filed in various jurisdictions. U.S. income taxes are provided on that portion of the earnings of foreign subsidiaries that is expected to be remitted to the U.S. and be taxable. The final taxes paid are dependent upon many factors and judgments, including negotiations with taxing authorities in various jurisdictions and resolution of disputes arising from federal, state and international tax audits. The judgments made at any point in time may change from previous conclusions based on the outcome of tax audits, as well as changes to, or further interpretations of, tax laws and regulations. We adjust income tax expense in the period in which these changes occur.
Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those differences are projected to be recovered or settled. Realization of deferred tax assets is dependent on our ability to generate sufficient taxable income of an appropriate character in future periods. A valuation allowance is established if it is determined to be more likely than not that a deferred tax asset will not be realized. Significant judgment is applied in evaluating the need for and the magnitude of appropriate valuation allowances against deferred tax assets. Interest and penalties related to unrecognized tax benefits are reported as interest expense and income tax expense, respectively.
Historically, a deferred income tax liability was recorded for income taxes that would result from the repatriation of the portion of the investment in our non-U.S. subsidiaries and joint venture that were considered to not be permanently reinvested. No deferred income tax liability was recorded for the remainder of our investment in non-U.S. subsidiaries and joint venture, which we believed to be permanently reinvested. In light of changes made by the Tax Act, the Company is evaluating whether it will continue to treat foreign subsidiary earnings as being permanently reinvested.

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As a large commercial enterprise with international operations, our income tax expense and our effective tax rate may change from period to period due to many factors. The most significant of these factors are changes in tax legislation in the countries in which we operate, changes in the geographic mix of earnings, the tax characteristics of our income, the ability to realize certain foreign tax credits and net operating losses, and the portion of the income of our foreign subsidiaries and foreign joint venture that could be subjected to U.S. taxation. It is reasonably likely that these items will impact income tax expense, net income and liquidity in future periods.
We operate in a number of countries and as a result have a significant amount of cross border transactions. The taxability of cross border transactions has received an increasing level of scrutiny among regulators in countries across the globe, including the countries in which we operate. The tax rules and regulations within the various countries in which we operate are complex and in many cases there is not symmetry between the rules of the various countries. As a result, there are instances where regulators within the countries involved in a cross border transaction may reach different conclusions regarding the taxability of the transaction in their respective jurisdictions based on the same set of facts and circumstances. We work closely with regulators to reach a common understanding and conclusion regarding the taxability of cross border transactions. However, there are instances where reaching a common understanding is not possible or practical. 
We recognize the effect of income tax positions only if sustaining those positions is more likely than not. Tax positions that meet the more likely than not recognition threshold but are not highly certain are measured based on the largest amount of benefit that is greater than 50% likely of being realized upon settlement with the taxing authority. As of December 31, 2017,2020, we have recorded a reserve for unrecognized tax benefits, including penalties and interest, of $151 million, which is related predominantly to certain potential tax exposures involving cross border transactions.$85 million. This amount represents our best estimate of the potential amounts due based on our interpretations of the rules and the facts and circumstances of the transactions. Differences in interpretation of the tax laws including agreements between governments surrounding our cross border transactions, can result in differences in taxes paid which may be higher or lower than our estimates.
Recoverability of Long-Lived Assets, Goodwill and Investments in Unconsolidated Subsidiaries
We review the carrying values of our property, plant and equipment and other long-lived assets, including our finite-lived intangible assets, goodwill and investments in affiliates including joint ventures in accordance with U.S. GAAP in order to assess recoverability. Factors that we must estimate when performing impairment tests include production and sales volume,volumes, selling prices, raw material costs, operating rates, operating expenses, inflation, discount rates, exchange rates, tax rates and capital spending. Significant judgment is involved in estimating each of these factors, which include inherent uncertainties. The factors we use are consistent with those used in our internal planning process. The recoverability of the values associated with our goodwill, long-lived assets and investments in unconsolidated affiliates is dependent upon future operating performance of
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the specific businesses to which they are attributed. Certain of the operating assumptions are particularly sensitive to the cyclical nature of the fertilizer business. Adverse changes in demand for our products, increases in supply and the availability and costs of key raw materials could significantly affect the results of our review.
The recoverability and impairment tests of long-lived assets are required only when conditions exist that indicate the carrying value may not be recoverable. For goodwill, impairment tests are required at least annually, or more frequently if events or circumstances indicate that it may be impaired. Our investmentsinvestment in an unconsolidated affiliates areaffiliate is reviewed for impairment whenever events or circumstances indicate that theits carrying value may not be recoverable. When circumstances indicate that the fair value of our investment in any such affiliate is less than its carrying value, and the reduction in value is other than temporary, the reduction in value iswould be recognized immediately in earnings.
PLNL is our joint venture investment in the Republic of Trinidad and Tobago and operates an ammonia plant that relies on natural gas supplied, under a Gas Sales Contract (the NGC Contract), by the NGC pursuant to the NGC Contract.National Gas Company of Trinidad and Tobago Limited (NGC). The joint venture is accounted for under the equity method. The joint venture has experienced past curtailments in the supply of natural gas from NGC, which have reduced the ammonia production at PLNL. The NGC Contract had an initial expiration date of September 2018 and has beenwas extended on the same terms until September 2023. Any NGC commitment to supply gas beyond 2023 will need to be based on new agreements regarding volume and price. PLNL and NGC are currently parties to arbitration proceedings where the main issue remaining in dispute is PLNL's claims for damages for past and ongoing curtailments.
Although the joint venture believes its claims against NGC to be meritorious, it is not possible to predict the outcome of the arbitration. There are significant assumptions in the future operations of the joint venture, beyond 2023, that are uncertain at this time, including the quantities of gas NGC will make available, the cost of such gas, the estimates that are used to determine the useful lives of fixed assets and the assumptions in the discounted cash flow models utilized for recoverability and impairment testing. As part of our 2016 impairment assessment of our equity method investment in PLNL, we determined the carrying value exceeded the fair value and recognized a $134 million impairment charge. Previously, in 2015, we recognized an impairment charge of $62 million related to our equity method investment in PLNL. The carrying value of our equity method investment in PLNL at December 31, 2017 is $108 million.agreements. If NGC does not make sufficient quantities of natural gas available to PLNL at prices that permit profitable operations, PLNL may cease operating its facility and we would write off the remaining investment in PLNL.

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our equity method investment in PLNL at December 31, 2020 is $80 million.
We evaluate goodwill for impairment in the fourth quarter at the reporting unit level. Our evaluation can begin with a qualitative assessment of the factors that could impact the significant inputs used to estimate fair value. If after performing the qualitative assessment, we determine that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill, then no further testinganalysis is performed.necessary. However, if it is unclear based on the results of the qualitative test, we perform a quantitative test, involving potentially two steps. The first step compareswhich involves comparing the fair value of a reporting unit with its carrying amount, including goodwill. We use an income-based valuation method, determining the present value of future cash flows, to estimate the fair value of a reporting unit. If the fair value of a reporting unit exceeds its positive carrying amount, goodwill of the reporting unit is considered not impaired, and the second step of the impairment testno further testing is unnecessary. The second step ofnecessary. If the goodwill impairment test, if needed, compares the implied fair value of the reporting unit goodwill with theis less than its carrying amount, of that goodwill. We recognize angoodwill impairment loss immediatelywould be recognized equal to the extentamount of the carrying value exceeds its impliedin excess of the reporting unit’s fair value.value, limited to the total amount of goodwill allocated to the reporting unit. We identified no goodwill impairment in our 2017, 20162020, 2019 or 2015 reviews.2018. As of December 31, 20172020 and 2016,2019, the carrying value of our goodwill was $2.37 billion and $2.35 billion, respectively.billion.
Intangible assets identified in connection with our 2010 acquisition of Terra Industries Inc. consist of customer relationships, which are being amortized over a period of 18 years. The intangible assets identified in connection with our 2015 acquisition of CF Fertilisers UK consist of customer relationships and trade names, which are being amortized over a period of approximately 20 years. Our intangible assets are presented in other assets on our consolidated balance sheets. See Note 6—7—Goodwill and Other Intangible Assets for additional information regarding our goodwill and other intangible assets.
Pension Assets and Liabilities
Pension assets and liabilities are affected by the fair value of plan assets, estimates of the expected return on plan assets, plan design, actuarial estimates and discount rates. Actual changes in the fair value of plan assets and differences between the actual return on plan assets and the expected return on plan assets affect the amount of pension expense ultimately recognized. Key assumptions that affect our projected benefit obligation (PBO) are discount rates and, in addition for our United Kingdom plans, an adjusted retail price index (RPI). Key assumptions affecting pension expense include discount rates, the expected long-term rate of return on assets (EROA) and, in addition for our United Kingdom plans, RPI.
The December 31, 20172020 PBO was computed based on a weighted-average discount rate of 3.6%2.4% for our North America plans and 2.5%1.5% for our United Kingdom plans, which were based on yields for high-quality (AA rated or better) fixed income debt securities that match the timing and amounts of expected benefit payments as of the measurement date of December 31.31, 2020. Declines in comparable bond yields would increase our PBO. The weighted-average discount rate used to calculate pension expense in 20172020 was 4.0%3.1% for North America plans and 2.8%2.0% for United Kingdom plans. Our net benefit obligation, after deduction of plan assets, could increase or decrease depending on the extent to which returns on pension plan assets are lower or higher than the discount rate. The 4.2%4.1% weighted-average EROA used to calculate pension expense in 20172020 for our North America plans is based on studies of actual rates of return achieved by equity and non-equity investments, both separately and in combination over historical holding periods. The 4.6%3.4% weighted-average EROA used to calculate pension expense in 20172020 for our United Kingdom plans is based on expected long-term performance of underlying investments. The EROA for both North America and United Kingdom plans are adjusted for expenses and diversification bonuses. The 3.2%bonuses, if applicable. For our United Kingdom plans, the 3.0% RPI used to calculate our United Kingdom plan PBO and the 3.3%3.0% RPI used to calculate 20172020 pension
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expense isare developed using the Bank of England implied retail price inflation curve, which is based on the difference between yields on fixed interest government bonds and index-linked government bonds.
For North America qualified pension plans, our PBO was $805$884 million as of December 31, 2017,2020, which was $67$38 million higher than pension plan assets. For our United Kingdom pension plans, our PBO was $590$643 million as of December 31, 20172020, which was $176$152 million higher than pension plan assets. The tables below estimate the impact of a 50 basis point increase or decrease in the key assumptions on our December 31, 20172020 PBO and 20172020 pension expense:
North America Plans
Increase/(Decrease) inIncrease/(Decrease) in
December 31, 2020 PBO2020 Pension Expense
Assumption+50 bps-50 bps+50 bps-50 bps
(in millions)
Discount Rate$(52)$58 $(2)$
EROAN/AN/A(4)
 North America Plans
 Increase/(Decrease) in Increase/(Decrease) in
 December 31, 2017 PBO
 2017 Pension Expense
Assumption+50 bps -50 bps +50 bps -50 bps
 (in millions)
Discount Rate$(46) $51
 $
 $3
EROAN/A
 N/A
 (3) 3

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United Kingdom PlansUnited Kingdom Plans
Increase/(Decrease) in Increase/(Decrease) inIncrease/(Decrease) inIncrease/(Decrease) in
December 31, 2017 PBO
 2017 Pension Expense
December 31, 2020 PBO2020 Pension Expense
Assumption+50 bps -50 bps +50 bps -50 bpsAssumption+50 bps-50 bps+50 bps-50 bps
(in millions)(in millions)
Discount Rate$(46) $50
 $1
 $
Discount Rate$(49)$53 $— $— 
EROAN/A
 N/A
 (2) 2
EROAN/AN/A(2)— 
RPI26
 (29) 2
 (1)RPI28 (30)(2)
See Note 10—11—Pension and Other Postretirement Benefits for further discussion of our pension plans.
Recent Accounting Pronouncements
See Note 3—New Accounting Standards for a discussion of recent accounting pronouncements.

Subsequent Event
In February 2021, the central portion of the United States experienced extreme and unprecedented cold weather. Certain natural gas suppliers declared force majeure events due to natural gas well freeze offs or frozen equipment. This occurred at the same time as large increases in natural gas demand were occurring due to the cold temperatures. Due to these unprecedented factors, several states declared a state of emergency and natural gas was redirected for residential usage. At certain of our manufacturing locations, we were asked to reduce our natural gas consumption and therefore these plants either operated at reduced rates or temporarily suspended operations. We returned excess natural gas to our suppliers and received prevailing market prices, which were in excess of our cost. During this period of time, we have experienced lower production, but have procured product in order to meet customer obligations. Higher maintenance and repair activity may be necessary as the plants are restarted. At the present time, we do not know the net positive or negative impact of these events on our operations; however, we do not expect it to result in a material impact to our business.
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ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.
We are exposed to the impact of changes in commodity prices, interest rates and foreign currency exchange rates.
Commodity Prices
Our net sales, cash flows and estimates of future cash flows related to nitrogen-based fertilizersproducts are sensitive to changes in fertilizerselling prices as well as changes in the prices of natural gas and other raw materials unless these costs have been fixed or hedged. A $1.00 per MMBtu change in the price of natural gas would change the cost to produce a ton of ammonia, granular urea, UAN (32%) and AN by approximately $32,$33, $22, $14 and $15, respectively.
Natural gas is the largest and most volatile component of the manufacturing cost for nitrogen-based fertilizers. We manageproducts. At certain times, we have managed the risk of changes in natural gas prices primarily withthrough the use of derivative financial instruments covering periods through December 2018.instruments. The derivative instruments that we may use for this purpose are primarily natural gas fixed price swaps, basis swaps and natural gas options. These derivatives settle using primarily a NYMEX futures price indexes,index, which representrepresents the basis for fair value at any given time. The contracts represent anticipated natural gas needs for future periods and settlements are scheduled to coincide with anticipated natural gas purchases during those future periods. As of December 31, 2020, we had natural gas fixed price swaps and basis swaps covering certain periods through March 2022.
As of December 31, 20172020 and 2016,2019, we had open derivative contracts for 35.934.1 million MMBtus and 183.041.1 million MMBtus, respectively. A $1.00 per MMBtu increase in the forward curve prices of natural gas at December 31, 20172020 would result in a favorable change in the fair value of these derivative positions of $33$18 million, and a $1.00 per MMBtu decrease in the forward curve prices of natural gas would change their fair value unfavorably by $33$18 million.
From time to time we may purchase nitrogen products on the open market to augment or replace production at our facilities.
Interest Rates
As of December 31, 2017,2020, we had sevensix series of senior notes totaling $4.75$4.00 billion of principal outstanding with maturity dates of May 1, 2020, December 1, 2021, June 1, 2023, December 1, 2026, March 15, 2034, June 1, 2043 and March 15, 2044. The senior notes have fixed interest rates. As of December 31, 2017,2020, the carrying value and fair value of our senior notes was approximately $4.69$3.96 billion and $4.80$4.73 billion, respectively.
Borrowings under the Revolving Credit Agreement bear current market rates of interest and we are subject to interest rate risk on such borrowings. There were no borrowings outstanding under the Revolving Credit Agreement as of December 31, 20172020 or December 31, 2016, or during 2017.2019. Maximum borrowings under the Revolving Credit Agreement during 20162020 were $150 million with a$500 million. The weighted-average annual interest rate of 1.85%.
Upon the termination of the Combination Agreement on May 22, 2016, the lenders’ commitmentsborrowings under the BridgeRevolving Credit Agreement terminated automatically.during 2020 was 2.05%. There were no borrowings under the BridgePrior Credit Agreement.Agreement or the Revolving Credit Agreement during 2019.
Foreign Currency Exchange Rates
From the fourth quarter of 2012 through 2016, we had entered into euro/U.S. dollar derivative hedging transactions related to the euro-denominated construction costs associated with our capacity expansion projects at our Donaldsonville, Louisiana and Port Neal, Iowa facilities. All of these foreign currency derivatives settled prior to December 31, 2016.
We are directly exposed to changes in the value of the Canadian dollar, the British pound and the euro. Outside of the transactions described above, weWe generally do not maintain any exchange rate derivatives or hedges related to these currencies.

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ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.
Report of Independent Registered Public Accounting Firm
TheTo the Stockholders and Board of Directors
CF Industries Holdings, Inc.:


Opinion on the Consolidated Financial Statements
We have audited the accompanying consolidated balance sheets of CF Industries Holdings, Inc. and subsidiaries (the Company) as of December 31, 20172020 and 2016,2019, the related consolidated statements of operations, comprehensive income, (loss), equity, and cash flows for each of the years in the three-year period ended December 31, 2017,2020, and the related notes (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 20172020 and 2016,2019, and the results of its operations and its cash flows for each of the years in the three‑year period ended December 31, 2017,2020, in conformity with U.S. generally accepted accounting principles.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2017,2020, based on criteria established in Internal ControlIntegrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 22, 201824, 2021 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.
Change in Accounting Principle
As discussed in Note 3 to the consolidated financial statements, the Company changed its method of accounting for Leases as of January 1, 2019 due to the adoption of Accounting Standards Update No. 2016-02, Leases(Topic 842).
Basis for Opinion
These consolidated financial statements are the responsibility of the Company'sCompany’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of a critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
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Evaluation of the measurement of projected benefit obligations
As discussed in Note 11 to the consolidated financial statements, the Company’s projected benefit obligation (PBO) associated with its pension plans established in North America and the United Kingdom were $884 million and $643 million as of December 31, 2020, respectively. The Company’s PBO represents an actuarially determined estimate of the present value of the future benefit payments attributed to past service under its pension plans to the beneficiaries of those plans. Determining the PBO requires the Company to make assumptions, including the selection of a discount rate for both the North American and United Kingdom plans and an adjusted retail price index (RPI) for the United Kingdom plans. The selected discount rate and RPI are then applied to these future benefit payments in determining the present value of those obligations as of December 31, 2020.
We identified the evaluation of the Company’s measurement of the PBO to be a critical audit matter. Specialized skills were needed to evaluate the assumptions regarding the discount rates utilized in the measurement of the PBO for both the North American and United Kingdom plans and the adjusted RPI utilized in the measurement of the PBO for the Company’s United Kingdom plans. In addition, a high degree of auditor judgment was required regarding the evaluation of these discount rates and the adjusted RPI, as minor changes to these assumptions could have a significant impact on the PBO.
The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls over the Company’s pension accounting process, including controls related to the determination of discount rates and adjusted RPI assumptions utilized in determining the Company’s PBO for both the North American and United Kingdom pension plans. We involved actuarial professionals with specialized skills and knowledge, who evaluated the Company’s PBO by evaluating the Company’s actuary reports. Specifically, as it relates to the selected discount rates and adjusted RPI assumptions, the actuarial professionals:
developed an understanding and assessed the methods used by the Company’s actuaries to develop the discount rates and adjusted RPI
evaluated the relevance and reliability of information used by the Company’s actuaries in the development of the discount rates and the adjusted RPI
evaluated the North American discount rates’ period over period change using market trends based on published yield curves and indices
recalculated the Company’s single equivalent discount rate using the PBO cash flows and the Company’s actuaries’ proprietary yield curve for the North American discount rates
independently developed a single equivalent discount rate using the PBO cash flows and publicly available yield curves for the North American pension plans, and compared that to the Company’s selected discount rates for North America
developed discount rates using publicly available yield curves for the United Kingdom, adjusted for the assessment of the timing of payments expected to be made to beneficiaries under the Company’s pension plans, and compared those to the Company’s selected discount rates for the United Kingdom
developed an inflationary factor using published spot rate projection based on the assessment of the timing of payments expected to be made to beneficiaries under the Company’s pension plans within the United Kingdom, and compared that to the Company’s adjusted RPI.



(signed) KPMG LLP




We have served as the Company’s auditor since 1983.
Chicago, Illinois
February 22, 2018


24, 2021
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CONSOLIDATED STATEMENTS OF OPERATIONS

Year ended December 31, Year ended December 31,
2017 2016 2015 202020192018
(in millions, except per share amounts) (in millions, except per share amounts)
Net sales$4,130
 $3,685
 $4,308
Net sales$4,124 $4,590 $4,429 
Cost of sales3,700
 2,845
 2,761
Cost of sales3,323 3,416 3,512 
Gross margin430
 840
 1,547
Gross margin801 1,174 917 
Selling, general and administrative expenses192
 174
 170
Selling, general and administrative expenses206 239 214 
Transaction costs
 179
 57
Other operating—net18
 208
 92
Other operating—net(17)(73)(27)
Total other operating costs and expenses210
 561
 319
Total other operating costs and expenses189 166 187 
Equity in earnings (losses) of operating affiliates9
 (145) (35)
Equity in earnings (loss) of operating affiliateEquity in earnings (loss) of operating affiliate11 (5)36 
Operating earnings229
 134
 1,193
Operating earnings623 1,003 766 
Interest expense315
 200
 133
Interest expense179 237 241 
Interest income(12) (5) (2)Interest income(18)(20)(13)
Loss on debt extinguishment53
 167
 
Loss on debt extinguishment21 
Other non-operating—net(2) (2) 4
Other non-operating—net(1)(7)(9)
(Loss) earnings before income taxes and equity in earnings of non-operating affiliates(125) (226) 1,058
Income tax (benefit) provision(575) (68) 396
Equity in earnings of non-operating affiliates—net of taxes
 
 72
Net earnings (loss)450
 (158) 734
Earnings before income taxesEarnings before income taxes463 772 547 
Income tax provisionIncome tax provision31 126 119 
Net earningsNet earnings432 646 428 
Less: Net earnings attributable to noncontrolling interests92
 119
 34
Less: Net earnings attributable to noncontrolling interests115 153 138 
Net earnings (loss) attributable to common stockholders$358
 $(277) $700
Net earnings (loss) per share attributable to common stockholders: 
  
  
Net earnings attributable to common stockholdersNet earnings attributable to common stockholders$317 $493 $290 
Net earnings per share attributable to common stockholders:Net earnings per share attributable to common stockholders:
Basic$1.53
 $(1.19) $2.97
Basic$1.48 $2.24 $1.25 
Diluted$1.53
 $(1.19) $2.96
Diluted$1.47 $2.23 $1.24 
Weighted-average common shares outstanding: 
  
  
Weighted-average common shares outstanding:
Basic233.5
 233.1
 235.3
Basic214.9 220.2 232.6 
Diluted233.9
 233.1
 236.1
Diluted215.2 221.6 233.8 
See Accompanying Notes to Consolidated Financial Statements.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

Year ended December 31,
Year ended December 31, 202020192018
2017 2016 2015 (in millions)
(in millions)
Net earnings (loss)$450
 $(158) $734
Net earningsNet earnings$432 $646 $428 
Other comprehensive income (loss): 
  
  
Other comprehensive income (loss):
Foreign currency translation adjustment—net of taxes127
 (74) (157)Foreign currency translation adjustment—net of taxes44 62 (105)
Derivatives—net of taxes(1) 
 
Derivatives—net of taxes(1)
Defined benefit plans—net of taxes9
 (74) 67
Defined benefit plans—net of taxes(57)
135
 (148) (90)46 (97)
Comprehensive income (loss)585
 (306) 644
Comprehensive incomeComprehensive income478 651 331 
Less: Comprehensive income attributable to noncontrolling interests92
 119
 34
Less: Comprehensive income attributable to noncontrolling interests115 153 138 
Comprehensive income (loss) attributable to common stockholders$493
 $(425) $610
Comprehensive income attributable to common stockholdersComprehensive income attributable to common stockholders$363 $498 $193 
See Accompanying Notes to Consolidated Financial Statements.

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CONSOLIDATED BALANCE SHEETS

December 31, December 31,
2017 2016 20202019
(in millions, except share and
per share amounts)
(in millions, except share and
per share amounts)
Assets 
  
Assets  
Current assets: 
  
Current assets:  
Cash and cash equivalents$835
 $1,164
Cash and cash equivalents$683 $287 
Restricted cash
 5
Accounts receivable—net307
 236
Accounts receivable—net265 242 
Inventories275
 339
Inventories287 351 
Prepaid income taxes33
 841
Prepaid income taxes97 71 
Other current assets15
 70
Other current assets35 23 
Total current assets1,465
 2,655
Total current assets1,367 974 
Property, plant and equipment—net9,175
 9,652
Property, plant and equipment—net7,632 8,170 
Investments in affiliates108
 139
Investment in affiliateInvestment in affiliate80 88 
Goodwill2,371
 2,345
Goodwill2,374 2,365 
Operating lease right-of-use assetsOperating lease right-of-use assets259 280 
Other assets344
 340
Other assets311 295 
Total assets$13,463
 $15,131
Total assets$12,023 $12,172 
Liabilities and Equity 
  
Liabilities and Equity  
Current liabilities: 
  
Current liabilities:  
Accounts payable and accrued expenses$472
 $638
Accounts payable and accrued expenses$424 $437 
Income taxes payable2
 1
Income taxes payable
Customer advances89
 42
Customer advances130 119 
Current operating lease liabilitiesCurrent operating lease liabilities88 90 
Current maturities of long-term debtCurrent maturities of long-term debt249 
Other current liabilities17
 5
Other current liabilities15 18 
Total current liabilities580
 686
Total current liabilities906 665 
Long-term debt4,692
 5,778
Long-term debt3,712 3,957 
Deferred income taxes1,047
 1,630
Deferred income taxes1,184 1,246 
Operating lease liabilitiesOperating lease liabilities174 193 
Other liabilities460
 545
Other liabilities444 474 
Equity: 
  
Equity:
Stockholders' equity: 
  
Stockholders’ equity:Stockholders’ equity:  
Preferred stock—$0.01 par value, 50,000,000 shares authorized
 
Preferred stock—$0.01 par value, 50,000,000 shares authorized
Common stock—$0.01 par value, 500,000,000 shares authorized, 2017—233,287,799 shares issued and 2016—233,141,771 shares issued2
 2
Common stock—$0.01 par value, 500,000,000 shares authorized, 2020—214,057,701 shares issued and 2019—216,023,826 shares issuedCommon stock—$0.01 par value, 500,000,000 shares authorized, 2020—214,057,701 shares issued and 2019—216,023,826 shares issued
Paid-in capital1,397
 1,380
Paid-in capital1,317 1,303 
Retained earnings2,443
 2,365
Retained earnings1,927 1,958 
Treasury stock—at cost, 2017—710 shares and 2016—27,602 shares
 (1)
Treasury stock—at cost, 2020—102,843 shares and 2019—0 sharesTreasury stock—at cost, 2020—102,843 shares and 2019—0 shares(4)
Accumulated other comprehensive loss(263) (398)Accumulated other comprehensive loss(320)(366)
Total stockholders' equity3,579
 3,348
Noncontrolling interests3,105
 3,144
Total stockholders’ equityTotal stockholders’ equity2,922 2,897 
Noncontrolling interestNoncontrolling interest2,681 2,740 
Total equity6,684
 6,492
Total equity5,603 5,637 
Total liabilities and equity$13,463
 $15,131
Total liabilities and equity$12,023 $12,172 
See Accompanying Notes to Consolidated Financial Statements.

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CONSOLIDATED STATEMENTS OF EQUITY
 Common Stockholders    
 $0.01 Par
Value
Common
Stock
 Treasury
Stock
 Paid-In
Capital
 Retained
Earnings
 Accumulated
Other
Comprehensive
Loss
 Total
Stockholders'
Equity
 Noncontrolling
Interests
 Total
Equity
 (in millions)
Balance as of December 31, 2014$2
 $(222) $1,414
 $3,175
 $(160) $4,209
 $363
 $4,572
Net earnings
 
 
 700
 
 700
 34
 734
Other comprehensive income: 
  
  
  
  
  
  
  
Foreign currency translation adjustment—net of taxes
 
 
 
 (157) (157) 
 (157)
Defined benefit plans—net of taxes
 
 
 
 67
 67
 
 67
Comprehensive income 
  
  
  
  
 610
 34
 644
Purchases of treasury stock
 (527) 
 
 
 (527) 
 (527)
Retirement of treasury stock
 597
 (62) (535) 
 
 
 
Acquisition of treasury stock under employee stock plans
 (2) 
 
 
 (2) 
 (2)
Issuance of $0.01 par value common stock under employee stock plans
 1
 8
 
 
 9
 
 9
Stock-based compensation expense
 
 16
 
 
 16
 
 16
Excess tax benefit from stock-based compensation
 
 2
 
 
 2
 
 2
Cash dividends ($1.20 per share)
 
 
 (282) 
 (282) 
 (282)
Distributions declared to noncontrolling interest
 
 
 
 
 
 (45) (45)
Balance as of December 31, 2015$2
 $(153) $1,378
 $3,058
 $(250) $4,035
 $352
 $4,387
Net (loss) earnings
 
 
 (277) 
 (277) 119
 (158)
Other comprehensive (loss) income: 
  
  
  
  
  
  
  
Foreign currency translation adjustment—net of taxes
 
 
 
 (74) (74) 
 (74)
Defined benefit plans—net of taxes
 
 
 
 (74) (74) 
 (74)
Comprehensive (loss) income 
  
  
  
  
 (425) 119
 (306)
Retirement of treasury stock
 150
 (14) (136) 
 
 
 
Acquisition of treasury stock under employee stock plans
 (1) 
 
 
 (1) 
 (1)
Issuance of $0.01 par value common stock under employee stock plans
 3
 (3) 
 
 
 
 
Stock-based compensation expense
 
 19
 
 
 19
 
 19
Cash dividends ($1.20 per share)
 
 
 (280) 
 (280) 
 (280)
Issuance of noncontrolling interest in CF Industries Nitrogen, LLC (CFN)
 
 
 
 
 
 2,792
 2,792
Distributions declared to noncontrolling interests.
 
 
 
 
 
 (119) (119)
Balance as of December 31, 2016$2
 $(1) $1,380
 $2,365
 $(398) $3,348
 $3,144
 $6,492
Net earnings
 
 
 358
 
 358
 92
 450
Other comprehensive income: 
  
  
  
  
  
  
  
Foreign currency translation adjustment—net of taxes
 
 
 
 127
 127
 
 127
Derivatives—net of taxes
 
 
 
 (1) (1) 
 (1)
Defined benefit plans—net of taxes
 
 
 
 9
 9
 
 9
Comprehensive income 
  
  
  
  
 493
 92
 585
Issuance of $0.01 par value common stock under employee stock plans
 1
 
 
 
 1
 
 1
Stock-based compensation expense
 
 17
 
 
 17
 
 17
Cash dividends ($1.20 per share)
 
 
 (280) 
 (280) 
 (280)
Distributions declared to noncontrolling interests
 
 
 
 
 
 (131) (131)
Balance as of December 31, 2017$2
 $
 $1,397
 $2,443
 $(263) $3,579
 $3,105
 $6,684
 Common Stockholders
 $0.01 Par
Value
Common
Stock
Treasury
Stock
Paid-In
Capital
Retained
Earnings
Accumulated
Other
Comprehensive
Loss
Total
Stockholders’
Equity
Noncontrolling
Interests
Total
Equity
 (in millions)
Balance as of December 31, 2017$$$1,397 $2,443 $(263)$3,579 $3,105 $6,684 
Adoption of ASU No. 2016-01(1)
Adoption of ASU No. 2014-09(1)(1)(1)
Adoption of ASU No. 2018-0210 (10)
Net earnings290 290 138 428 
Other comprehensive loss(97)(97)(97)
Purchases of treasury stock(500)(500)(500)
Issuance of $0.01 par value common stock under employee stock plans(4)12 
Stock-based compensation expense21 21 21 
Cash dividends ($1.20 per share)(280)(280)(280)
Acquisition of noncontrolling interests in TNCLP(62)(62)(331)(393)
Distributions declared to noncontrolling interests(139)(139)
Balance as of December 31, 2018$$(504)$1,368 $2,463 $(371)$2,958 $2,773 $5,731 
Net earnings493 493 153 646 
Other comprehensive income
Purchases of treasury stock(337)(337)(337)
Retirement of treasury stock843 (110)(733)
Acquisition of treasury stock under employee stock plans(4)(4)(4)
Issuance of $0.01 par value common stock under employee stock plans17 19 19 
Stock-based compensation expense28 28 28 
Cash dividends ($1.20 per share)(265)(265)(265)
Distributions declared to noncontrolling interest(186)(186)
Balance as of December 31, 2019$$$1,303 $1,958 $(366)$2,897 $2,740 $5,637 
Net earnings317 317 115 432 
Other comprehensive income46 46 46 
Purchases of treasury stock(100)(100)(100)
Retirement of treasury stock107 (17)(90)
Acquisition of treasury stock under employee stock plans(13)— (13)(13)
Issuance of $0.01 par value common stock under employee stock plans
Stock-based compensation expense25 25 25 
Cash dividends ($1.20 per share)(258)(258)(258)
Distributions declared to noncontrolling interest(174)(174)
Balance as of December 31, 2020$$(4)$1,317 $1,927 $(320)$2,922 $2,681 $5,603 
See Accompanying Notes to Consolidated Financial Statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS
Year ended December 31, Year ended December 31,
2017 2016 2015 202020192018
(in millions) (in millions)
Operating Activities: 
  
  
Operating Activities:   
Net earnings (loss)$450
 $(158) $734
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities: 
  
  
Net earningsNet earnings$432 $646 $428 
Adjustments to reconcile net earnings to net cash provided by operating activities:Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization883
 678
 480
Depreciation and amortization892 875 888 
Deferred income taxes(601) 739
 78
Deferred income taxes(74)149 78 
Stock-based compensation expense17
 19
 17
Stock-based compensation expense25 28 22 
Unrealized net loss (gain) on natural gas and foreign currency derivatives61
 (260) 163
Unrealized net (gain) loss on natural gas derivativesUnrealized net (gain) loss on natural gas derivatives(6)14 (13)
Loss on embedded derivative4
 23
 
Loss on embedded derivative
Gain on remeasurement of CF Fertilisers UK investment
 
 (94)
Impairment of equity method investment in PLNL
 134
 62
(Gain) loss on sale of equity method investments(14) 
 43
Loss on debt extinguishment53
 167
 
Loss on debt extinguishment21 
Loss on disposal of property, plant and equipment3
 10
 21
Undistributed losses (earnings) of affiliates—net of taxes3
 9
 (3)
Loss (gain) on disposal of property, plant and equipmentLoss (gain) on disposal of property, plant and equipment15 (40)
Undistributed (earnings) losses of affiliate—net of taxesUndistributed (earnings) losses of affiliate—net of taxes(1)(3)
Changes in: 
  
  
Changes in:
Accounts receivable—net(57) 18
 (4)Accounts receivable—net(19)(6)68 
Inventories40
 (7) (71)Inventories27 (26)(52)
Accrued and prepaid income taxes809
 (676) (148)Accrued and prepaid income taxes22 
Accounts payable and accrued expenses(1) (18) 42
Accounts payable and accrued expenses(15)(72)44 
Customer advances48
 (120) (164)Customer advances11 (30)59 
Other—net(67) 59
 51
Other—net(67)(82)(37)
Net cash provided by operating activities1,631
 617
 1,207
Net cash provided by operating activities1,231 1,505 1,497 
Investing Activities: 
  
  
Investing Activities:   
Additions to property, plant and equipment(473) (2,211) (2,469)Additions to property, plant and equipment(309)(404)(422)
Proceeds from sale of property, plant and equipment20
 14
 12
Proceeds from sale of property, plant and equipment70 26 
Proceeds from sale of equity method investment16
 
 13
Purchase of CF Fertilisers UK, net of cash acquired
 
 (552)
Proceeds from sale of auction rate securities9
 
 
Distributions received from unconsolidated affiliates14
 
 
Withdrawals from restricted cash funds5
 18
 63
Distributions received from unconsolidated affiliateDistributions received from unconsolidated affiliate10 
Insurance proceeds for property, plant and equipmentInsurance proceeds for property, plant and equipment15 10 
Other—net1
 2
 (43)Other—net
Net cash used in investing activities(408) (2,177) (2,976)Net cash used in investing activities(299)(319)(375)
Financing Activities: 
  
  
Financing Activities:   
Proceeds from long-term borrowings
 1,244
 1,000
Payments of long-term borrowings(1,148) (1,170) 
Payments of long-term borrowings(769)
Proceeds from short-term borrowings
 150
 367
Proceeds from short-term borrowings500 
Payments of short-term borrowings
 (150) (367)
Repayments of short-term borrowingsRepayments of short-term borrowings(500)
Payment to CHS related to credit provision(5) (5) 
Payment to CHS related to credit provision(5)(5)(5)
Financing fees(1) (31) (47)Financing fees(3)
Purchases of treasury stock
 
 (556)Purchases of treasury stock(100)(370)(467)
Dividends paid on common stock(280) (280) (282)Dividends paid on common stock(258)(265)(280)
Issuance of noncontrolling interest in CFN
 2,800
 
Acquisition of noncontrolling interests in TNCLPAcquisition of noncontrolling interests in TNCLP(388)
Distributions to noncontrolling interests(131) (119) (45)Distributions to noncontrolling interests(174)(186)(139)
Issuances of common stock under employee stock plans1
 
 8
Proceeds from issuances of common stock under employee stock plansProceeds from issuances of common stock under employee stock plans19 12 
Shares withheld for taxes
 
 (1)Shares withheld for taxes(10)(4)(4)
Net cash (used in) provided by financing activities(1,564) 2,439
 77
Net cash used in financing activitiesNet cash used in financing activities(542)(1,583)(1,270)
Effect of exchange rate changes on cash and cash equivalents12
 (1) (19)Effect of exchange rate changes on cash and cash equivalents(5)
(Decrease) increase in cash and cash equivalents(329) 878
 (1,711)
Increase (decrease) in cash and cash equivalentsIncrease (decrease) in cash and cash equivalents396 (395)(153)
Cash and cash equivalents at beginning of period1,164
 286
 1,997
Cash and cash equivalents at beginning of period287 682 835 
Cash and cash equivalents at end of period$835
 $1,164
 $286
Cash and cash equivalents at end of period$683 $287 $682 
See Accompanying Notes to Consolidated Financial Statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.    Background and Basis of Presentation
We are onea leading global manufacturer of the largest manufacturershydrogen and distributors of nitrogen products for clean energy, fertilizer, emissions abatement, and other industrial applications. We operate nitrogen productsmanufacturing complexes in the world.United States, Canada and the United Kingdom, which are among the most cost-advantaged, efficient and flexible in the world, and an extensive storage, transportation and distribution network in North America. Our 3,000 employees focus on safe and reliable operations, environmental stewardship and disciplined capital and corporate management, driving our strategy to leverage our unique capabilities to accelerate the world’s transition to clean energy. Our principal customers are cooperatives, independent fertilizer distributors, farmerstraders, wholesalers and industrial users. Our principalcore product is anhydrous ammonia (ammonia), which contains 82% nitrogen fertilizerand 18% hydrogen. Our nitrogen products that are upgraded from ammonia are granular urea, urea ammonium nitrate solution (UAN) and ammonium nitrate (AN). Our other nitrogen products include diesel exhaust fluid (DEF), urea liquor, nitric acid and aqua ammonia, which are sold primarily to our industrial customers, and compound fertilizer products (NPKs), which are solid granular fertilizer products for which the nutrient content is a combination of nitrogen, phosphorus and potassium. We operate world-class nitrogen manufacturing complexes in the United States, Canada and the United Kingdom, and distribute plant nutrients through a system of terminals, warehouses, and associated transportation equipment located primarily in the Midwestern United States. We also export nitrogen fertilizer products from our Donaldsonville, Louisiana and Yazoo City, Mississippi manufacturing facilities and our United Kingdom manufacturing facilities in Billingham and Ince.
All references to "CF“CF Holdings," "the” “the Company," "we," "us"” “we,” “us” and "our"“our” refer to CF Industries Holdings, Inc. and its subsidiaries, except where the context makes clear that the reference is only to CF Industries Holdings, Inc. itself and not its subsidiaries. All references to "CF Industries"“CF Industries” refer to CF Industries, Inc., a 100% owned subsidiary of CF Industries Holdings, Inc.
Our principal assets as of December 31, 2020 include:
four5 U.S. nitrogen fertilizer manufacturing facilities located in:in Donaldsonville, Louisiana; Port Neal, Iowa; Yazoo City, Mississippi; Verdigris, Oklahoma; and Woodward, Oklahoma. These facilities are wholly owned directly or indirectly by CF Industries Nitrogen, LLC (CFN), of which we own approximately 89% and CHS Inc. (CHS), owns the remainder. See Note 16—17—Noncontrolling Interests for additional information on our strategic venture with CHS;
an approximately 75.3% interest in Terra Nitrogen Company, L.P. (TNCLP), a publicly traded limited partnership of which we are the sole general partner and the majority limited partner and which, through its subsidiary Terra Nitrogen, Limited Partnership (TNLP), operates a nitrogen fertilizer manufacturing facility in Verdigris, Oklahoma;
two2 Canadian nitrogen fertilizer manufacturing facilities, located in Medicine Hat, Alberta and Courtright, Ontario;
two2 United Kingdom nitrogen manufacturing complexes,facilities, located in Billingham and Ince;
an extensive system of terminals and associated transportation equipment located primarily in the Midwestern United States; and
a 50% interest in Point Lisas Nitrogen Limited (PLNL), an ammonia production joint venture located in the Republic of Trinidad and Tobago that we account for under the equity method.
On February 7, 2018, we announced that Terra Nitrogen GP Inc. (TNGP), the sole general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP on April 2, 2018, for a cash purchase price of $84.033 per unit in accordance with the terms of TNCLP’s partnership agreement. See Note 26—Subsequent Event for additional information.
2.    Summary of Significant Accounting Policies
Consolidation and Noncontrolling Interests
The consolidated financial statements of CF Holdings include the accounts of CF Industries and all majority-owned subsidiaries. All significant intercompany transactions and balances have been eliminated.
TNCLP is a master limited partnership that is consolidated in the financial statements of CF Holdings. TNCLP owns the nitrogen fertilizer manufacturing facility in Verdigris, Oklahoma. We own approximately 75.3% of TNCLP and outside investors own the remaining approximately 24.7%. Partnership interests in TNCLP are traded on the New York Stock Exchange (NYSE). As a result, TNCLP files separate financial reports with the Securities and Exchange Commission (SEC). The outside investors' limited partnership interests in the partnership are included in noncontrolling interests in our consolidated financial statements. This noncontrolling interest represents the noncontrolling unitholders' interest in the partners' capital of TNCLP.

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On February 7,In 2018, we announced that TNGPTerra Nitrogen GP Inc. (TNGP), the sole general partner of Terra Nitrogen Company, L.P. (TNCLP) and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP on(the TNCLP Public Units). On April 2, 2018, TNGP completed its purchase of the TNCLP Public Units (the Purchase) for aan aggregate cash purchase price of $84.033 per unit$388 million. Upon completion of the Purchase, we owned, through our subsidiaries, 100% of the general and limited partnership interests of TNCLP. Prior to the purchase of the TNCLP Public Units, we owned approximately 75.3% of TNCLP through general and limited partnership interests and outside investors owned the remaining approximately 24.7% of the limited partnership, and we consolidated TNCLP into our financial statements. The outside investors’ limited partnership interests in accordance with the termspartnership were included in noncontrolling interests in our consolidated financial statements prior to our purchase of TNCLP’s partnership agreement. See Note 26—Subsequent Event for additional information.the TNCLP Public Units.
On February 1, 2016, CHS purchased a minority equity interest in CFN. We own approximately 89% of the membership interests in CFN and consolidate CFN in our financial statements. CHS'CHS’ minority equity interest in CFN is included in noncontrolling interests in our consolidated financial statements, and represents CHS' interest in the membership interestsstatements.
See Note 17—Noncontrolling Interests for additional information.
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Use of Estimates
The preparation of financial statements in conformity with accounting principles generally accepted in the United States (U.S. GAAP) requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses for the periods presented. Significant estimates and assumptions are used for, but are not limited to, net realizable value of inventories, environmental remediation liabilities, environmental and litigation contingencies, the cost of customer incentives, useful lives of property and identifiable intangible assets, the assumptions used in the evaluation of potential impairments of property, investments, identifiable intangible assets and goodwill, income tax and valuation reserves,taxes, allowances for doubtful accounts receivable, the measurement of the fair values of investments for which markets are not active, assumptions used in the determination of the funded statusbenefit obligation and annual expense of defined benefit pension and other postretirement plans the assumptions used to determine the relative fair values of new reportable segments and the assumptions used in the valuation of stock-based compensation awards granted to employees.
Revenue Recognition
The basic criteria necessaryWe follow a five-step model for revenue recognitionrecognition. The five steps are: (1) evidence that a sales arrangement exists,identification of the contract(s) with the customer, (2) deliveryidentification of goods has occurred,the performance obligation(s) in the contract(s), (3) determination of the seller'stransaction price, (4) allocation of the transaction price to the buyer is fixed or determinable,performance obligation(s), and (4) collectability is reasonably assured. We recognize(5) recognition of revenue when these criteria have been met(or as) each performance obligation is satisfied. Control of our products transfers to our customers when the customer is able to direct the use of, and obtain substantially all of the benefits from, our products, which occurs at the later of when title andor risk of loss transfers to the customer. Control generally transfers to the customer which can be at the plant gate, a distribution facility, a supplier locationpoint in time upon loading of our product onto transportation equipment or delivery to a customer destination. Revenue from forward sales programs is recognized on the same basis as other sales (when title and risk of loss transfers to the customer) regardless of when the customer advances are received.
We offer certain incentives that typically involve rebates if a customer reaches a specified levelIn situations where we have agreed to arrange delivery of purchases. Customer incentives are accrued monthlythe product to the customer’s intended destination and reportedcontrol of the product transfers upon loading of our product, we have elected to not identify delivery of the product as a reduction in net sales. This process is intendedperformance obligation. We account for freight income associated with the delivery of these products as freight revenue, since this activity fulfills our obligation to report sales attransfer the ultimate net realized price and requiresproduct to the use of estimates.
Shipping and handling fees billed to customers are reported in revenue.customer. Shipping and handling costs incurred by us are included in cost of sales.
We offer cash incentives to certain customers based on the volume of their purchases over a certain period. Customer incentives are reported as a reduction in net sales.
Cash and Cash Equivalents
Cash and cash equivalents include highly liquid investments that are readily convertible to known amounts of cash with original maturities of three months or less. The carrying value of cash and cash equivalents approximates fair value.
Investments
Short-term investments and noncurrent investments are accounted for primarily as available-for-sale securities reported at fair value with changesvalue. Changes in the fair value reportedof available-for-sale debt securities are recognized in other comprehensive income unlessincome. Changes in the fair value is below amortized cost (i.e., the investment is impaired) and the impairment is deemed other-than-temporary, in which case, some or all of the decline in value would be charged toavailable-for-sale equity securities are recognized through earnings. The carrying values of short-term investments approximate fair values because of the short maturities and the highly liquid nature of these investments.
Accounts Receivable and Allowance for Doubtful Accounts
Accounts receivable includes trade receivables and non-trade receivables. Accounts receivable are recorded at face amounts less an allowance for doubtful accounts. The allowance is an estimate based on historical collection experience, current economic and market conditions, and a review of the current status of each customer's trade accounts receivable. A receivable is past due if payments have not been received within the agreed-upon invoice terms. Account balances are charged-off against the allowance when management determines that it is probable that the receivable will not be recovered.

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Inventories
Inventories are reported at the lower of cost and net realizable value with cost determined on a first-in, first-out (FIFO) and average cost basis. Inventory includes the cost of materials, production labor and production overhead. Inventory at warehouses and terminals also includes distribution costs to move inventory to the distribution facilities. Net realizable value is reviewed at least quarterly. Fixed production costs related to idle capacity are not included in the cost of inventory but are charged directly to cost of sales in the period incurred.
Investment in Unconsolidated Affiliate
The equity method of accounting is used for investmentsour investment in affiliatesan affiliate that we do not consolidate, but over which we have the ability to exercise significant influence. Our equity method investment for which the results are included in operating earnings consists of our 50% ownership interest in PLNL, which operates an ammonia production facility in the Republic of Trinidad and Tobago. Our share of the net earnings from this investment is reported as an element of earnings from operations because PLNL'sPLNL’s operations provide additional production and are integrated with our supply chain and sales activities in the ammonia segment. See Note 7—8—Equity Method InvestmentsInvestment for additional information.
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Profits resulting from sales or purchases with equity method investees are eliminated until realized by the investee or investor, respectively. Investments in affiliates are reviewed for impairment whenever events or circumstances indicate that the carrying value may not be recoverable. WhenIf circumstances indicate that the fair value of an investment in an affiliate is less than its carrying value, and the reduction in value is other than temporary, the reduction in value iswould be recognized immediately in earnings.
Property, Plant and Equipment
Property, plant and equipment are stated at cost. Depreciation and amortization are computed using the straight-line method or the units-of-production (UOP) method and are recorded over the estimated useful life of the property, plant and equipment. Useful lives are as follows:
Years
Mobile and office equipment3 to 10
Production facilities and related assets2 to 30
Land improvements10 to 30
Buildings10 to 40
We periodically review the useful lives assigned to our property, plant and equipment as well as estimated production capacities used to develop UOP depreciation expense, and we change the estimates to reflect the results of those reviews.
Scheduled inspections, replacements and overhauls of plant machinery and equipment at our continuous process manufacturing facilities during a full plant shutdown are referred to as plant turnarounds. Plant turnarounds are accounted for under the deferral method, as opposed to the direct expense or built-in overhaul methods. Under the deferral method, expenditures related to turnarounds are capitalized in property, plant and equipment when incurred and amortized to production costs on a straight-line basis over the period benefited, which is until the next scheduled turnaround in up to five years. If the direct expense method were used, all turnaround costs would be expensed as incurred. Internal employee costs and overhead amounts are not considered turnaround costs and are not capitalized. Turnaround costs are classified as investing activities in theour consolidated statements of cash flows. See Note 5—6—Property, Plant and Equipment—Net for additional information.
Recoverability of Long-Lived Assets
We review property, plant and equipment and other long-lived assets in order to assess recoverability based on expected future undiscounted cash flows whenever events or circumstances indicate that the carrying value may not be recoverable. If the sum of the expected future net cash flows is less than the carrying value, an impairment loss iswould be recognized. The impairment loss is measured as the amount by which the carrying value exceeds the fair value of the asset.
Goodwill and Other Intangible Assets
Goodwill represents the excess of the purchase price of an acquired entity over the amounts assigned to the assets acquired and liabilities assumed. Goodwill is not amortized, but is reviewed for impairment annually or more frequently if certain impairment conditions arise. We perform our annual goodwill impairment review in the fourth quarter of each year at the reporting unit level. Our evaluation can begin with a qualitative assessment of the factors that could impact the significant

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inputs used to estimate fair value. If after performing the qualitative assessment, we determine that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill, then no further testinganalysis is performed.necessary. However, if it is unclear based on the results of the qualitative test are unclear, we perform a quantitative test, involving potentially two steps. The first step compareswhich involves comparing the fair value of a reporting unit with its carrying amount, including goodwill. We use an income-based valuation method, determining the present value of future cash flows, to estimate the fair value of a reporting unit. If the fair value of a reporting unit exceeds its positive carrying amount, goodwill of the reporting unit is considered not impaired, and the second step of the impairment testno further analysis is unnecessary. The second step ofnecessary. If the goodwill impairment test, if needed, compares the implied fair value of the reporting unit goodwill with theis less than its carrying amount, of that goodwill. We recognize angoodwill impairment loss immediatelywould be recognized equal to the extentamount of the carrying value exceeds its impliedin excess of the reporting unit’s fair value.value, limited to the total amount of goodwill allocated to the reporting unit.
Our intangible assets are presented in other assets on our consolidated balance sheets. See Note 6—7—Goodwill and Other Intangible Assets for additional information regarding our goodwill and other intangible assets.
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Leases
Right-of-use (ROU) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The discount rate used to calculate the present value represents our secured incremental borrowing rate and is calculated based on the treasury yield curve commensurate with the term of each lease, and a spread representative of our secured borrowing costs. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.
Leases may be classified as either operating leases or capitalfinance leases. Assets acquired under capitalWe have made an accounting policy election to not include leases with an initial term of 12 months or less on the balance sheet. For finance leases, if any, would be depreciatedROU assets are amortized over the lease term on a straight-line basis and interest expense is recognized using the effective interest method and based on the same basis as property, plant and equipment.lease liability at period end. For operating leases, rental payments, including rent holidays, leasehold incentives, and scheduled rent increases are expensed on a straight-line basis. Leasehold improvements are amortized over the shorter of the depreciable lives of the corresponding fixed assets or the lease term including any applicable renewals. For our rail car leases, barge tow charters, and terminal and warehouse storage agreements, we have made an accounting policy election to not separate lease and non-lease components, such as operating costs and maintenance, due to sufficient data not being available. As a result, the non-lease components are included in the ROU assets and lease liabilities on our consolidated balance sheet. See Note 24—Leases for additional information.
Income Taxes
Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those differences are projected to be recovered or settled. Realization of deferred tax assets is dependent on our ability to generate sufficient taxable income of an appropriate character in future periods. A valuation allowance is established if it is determined to be more likely than not that a deferred tax asset will not be realized. Significant judgment is applied in evaluating the need for and magnitude of appropriate valuation allowances against deferred tax assets.
We record our tax expense for Global Intangible Low-Taxed Income (GILTI) as an expense in the period in which incurred and as such do not record a deferred tax liability for taxes that may be due in future periods.
Interest and penalties related to unrecognized tax benefits are reported as interest expense and income tax expense, respectively.
Historically, a deferred income tax liability was recordedSee Note 10—Income Taxes for income taxes that would result from the repatriation of the portion of the investment in the Company's non-U.S. subsidiaries and joint venture that were considered to not be permanently reinvested. No deferred income tax liability was recorded for the remainder of our investment in non-U.S. subsidiaries and joint venture, which we believed to be permanently reinvested.additional information.
Customer Advances
Customer advances represent cash received from customers following acceptance of orders under our forward sales programs. SuchUnder such advances, typically representthe customer prepays a significant portion of the contract'svalue of the sales value and are generally collected bycontract prior to obtaining control of the time the product, is shipped, thereby reducing or eliminating accounts receivable from customers upon shipment.customers. Revenue is recognized when title and risk of loss transfers upon shipment or deliverythe customer obtains control of the product to customers.product.
Derivative Financial Instruments
Natural gas is the principal raw material used to produce nitrogen fertilizers.nitrogen-based products. We manage the risk of changes in natural gas prices primarily through the use of derivative financial instruments. The derivative instruments that we may use are primarily natural gas fixed price swaps, basis swaps and options traded in the over-the-counter (OTC) markets. The derivatives reference primarily a NYMEX futures contract prices,price index, which represent the basis for fair value at any given time. These derivatives are traded in months forward and settlements are scheduled to coincide with anticipated gas purchases during those future periods.
In order to manage our exposure to changes in foreign currency exchange rates related to our capacity expansion projects, we used foreign currency We do not use derivatives primarily forward exchange contracts. All of these foreign currency derivatives settled in 2016.
The accounting for the change in the fair value of a derivative instrument depends on whether the instrument has been designated as a hedging instrument and whether the instrument is effective as part of a hedging relationship. Changes in the fair value of derivatives not designated as hedging instruments and the ineffective portion of derivatives designated as cash flow hedges are recorded in the consolidated statements of operations as the changes occur. Changes in the fair value of derivatives designated as cash flow hedging instruments considered effective are recorded in accumulated other comprehensive income (AOCI) as the changes occur,trading purposes and are reclassified into income or expense as the hedged item is recognized in earnings.

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not a party to any leveraged derivatives.
Derivative financial instruments are accounted for at fair value and recognized as current or noncurrent assets and liabilities on our consolidated balance sheets. We use natural gas derivatives as an economic hedge of natural gas price risk, but without the application of hedge accounting. As a result, changes in fair value of these contracts are recognized in earnings. The fair values of derivative instruments and any related cash collateral are reported on a gross basis rather than on a net basis.
Cash flows related to natural gas derivatives are reported as operating activities. Cash flows related to foreign currency derivatives were reported as investing activities since they hedged future payments for the construction of long-term assets.
We do not use derivatives for trading purposes and are not a party to any leveraged derivatives. See Note 14—15—Derivative Financial Instruments for additional information.
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Debt Issuance Costs
Costs associated with the issuance of debt are recorded on the balance sheet as a direct deduction from the carrying amount of the related debt liability. Costs associated with entering into revolving credit facilities are recorded as an asset in noncurrent assets. All debt issuance costs are amortized over the term of the related debt.debt using the effective interest rate method. Debt issuance discounts are netted against the related debt and are amortized over the term of the debt using the effective interest method. See Note 11—12—Financing Agreements for additional information.
Environmental
Environmental expenditures that relate to current operations are expensed or capitalized as appropriate. Expenditures that relate to an existing condition caused by past operations are expensed. Expenditures that increase the capacity or extend the useful life of an asset, improve the safety or efficiency of the operations, or mitigate or prevent future environmental contamination are capitalized. Liabilities are recorded when it is probable that an obligation has been incurred and the costs can be reasonably estimated,estimated. Environmental liabilities are not discounted.
Emission Credits
Emission credits may be generated by or granted to the Company through emissions trading systems or otherregulatory programs. From time to time, we may also purchase emission credits. We have elected to account for emission credits using the intangible asset model. Under this model, emission credits that are purchased are measured at their cost basis and tested for impairment annually. We do not recognize any internally generated emission credits under the intangible asset model until a monetary transaction occurs, such as a sale of the emission credits. If a facility exceeds regulatory emissions allowance levels and offsetting credits are not held by us, our obligation is recognized as an operating expense and a liability would not be discounted.at the fair value of the emissions allowance deficit.
Stock-based Compensation
We grant stock-based compensation awards under our equity and incentive plans. The awards that have been granted to date are nonqualified stock options, restricted stock awards, restricted stock units and performance sharerestricted stock units. The cost of employee services received in exchange for the awards is measured based on the fair value of the award on the grant date and is recognized as expense on a straight-line basis over the period during which the employee is required to provide the services. We have elected to recognize equity award forfeitures as they occur in determining the compensation cost to be recognized in each period.See Note 18—Stock-Based19—Stock-based Compensation for additional information.
Treasury Stock
We periodically retire treasury shares acquired through repurchases of our common stock and return those shares to the status of authorized but unissued. We account for treasury stock transactions under the cost method. For each reacquisition of common stock, the number of shares and the acquisition price for those shares is added to the treasury stock count and total value. When treasury shares are retired, we allocate the excess of the repurchase price over the par value of shares acquired to both retained earnings and paid-in capital. The portion allocated to paid-in capital is determined by applying the average paid-in capital per share, and the remaining portion is recorded to retained earnings.
Litigation
From time to time, we are subject to ordinary, routine legal proceedings related to the usual conduct of our business. We may also be involved in proceedings regarding public utility and transportation rates, environmental matters, taxes and permits relating to the operations of our various plants and facilities. Accruals for such contingencies are recorded to the extent management concludes their occurrence is probable and the financial impact of an adverse outcome is reasonably estimable. Legal fees are recognized as incurred and are not included in accruals for contingencies. Disclosure for specific legal contingencies is provided if the likelihood of occurrence is at least reasonably possible and the exposure is considered material to the consolidated financial statements.
In making determinations of likely outcomes of litigation matters, many factors are considered. These factors include, but are not limited to, past history, scientific and other evidence, and the specifics and status of each matter. If the assessment of various factors changes, the estimates may change. Predicting the outcome of claims and litigation, and estimating related costs and exposure, involves substantial uncertainties that could cause actual costs to vary materially from estimates and accruals.
Foreign Currency Translation
We translate the financial statements of our foreign subsidiaries with non-U.S. dollar functional currencies using period-end exchange rates for assets and liabilities and weighted-average exchange rates for each period for revenues and expenses.
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The resulting translation adjustments are recorded as a separate component of AOCIaccumulated other comprehensive income (loss) within stockholders'stockholders’ equity.

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Foreign currency-denominated assets and liabilities are remeasured into U.S. dollars at exchange rates existing at the respective balance sheet dates. Gains and losses resulting from these foreign currency transactions are included in other operating—net on our consolidated statements of operations. Gains and losses resulting from intercompany foreign currency transactions that are of a long-term investment nature, if any, are reported in other comprehensive income.
3.    New Accounting Standards
Recently Adopted Pronouncements
On January 1, 2017,2020, we adopted Accounting Standards Update (ASU) No. 2015-11, Inventory (Topic 330)2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Simplifying the Measurement of Inventory. ASU No. 2015-11 changes the inventory measurement principleCustomer’s Accounting for entities using the FIFO or average cost methods. For entities utilizing one of these methods, the inventory measurement principle changed from lower of cost or market to the lower of cost and net realizable value. We follow the FIFO or average cost methods and the adoption of ASU No. 2015-11 did not haveImplementation Costs Incurred in a material impact on our consolidated financial statements.
Recently Issued Pronouncements
In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) Topic 605, Revenue Recognition.Cloud Computing Arrangement That is a Service Contract. This ASU aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is based ona service contract with the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchangerequirements for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments. Additionally, the costs to obtain and fulfill a contract, including assets to be recognized, are to be capitalized and amortized and such capitalized costs should be disclosed. In 2016, the FASB issued additional ASUs that enhance the operability of the principal versus agent guidance in ASU No. 2014-09 by clarifying that an entity should consider the nature of each good or service promised to a customer at the individual good or service level, clarify that ASU No. 2014-09 should not be applied to immaterial performance obligations, and enhance the guidance around the treatment of shippingcapitalizing implementation costs incurred to fulfill performance obligations.develop or obtain internal-use software. This ASU does not affect the accounting for the service element of a hosting arrangement that is a service contract. We adopted this ASU No. 2014-09 on January 1, 2018 using the modified retrospective approach. While we will provide expanded disclosures as a result of ASU No. 2014-09, theprospectively. The adoption of this ASU did not have a material impact on our consolidated financial statements.statements; however, it could have an effect on future financial results if significant new software involving a cloud computing agreement is implemented. In this case, a certain portion of the implementation costs would be deferred and expensed over the term of the cloud computing arrangement.
In February 2016, the FASB issuedOn January 1, 2019, we adopted ASU No. 2016-02, Leases (Topic 842), which supersedes the lease accounting requirements in ASC Topic 840, Leases. This ASU will requirerequires lessees to recognize the rights and obligations resulting from virtually all leases (other than leases that meet the definition of a short-term lease) on their balance sheets as right-of-use assets with corresponding lease liabilities. Extensive quantitative and qualitative disclosures, including significant judgments made by management, will beare required to provide greater insight into the extent of income and expense recognized and expected to be recognized from existing contracts. ThisWe elected the optional transition method provided under ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted, and requiresNo. 2018-11, Leases (Topic 842): Targeted Improvements, which provides the modified retrospective method of adoption. While we are continuingoption to evaluate the impactadopt ASU No. 2016-02 as of the adoption of this ASU on our consolidated financial statements, we currently believe the most significant change relatesdate with a cumulative-effect adjustment to the recognitionopening balance of new right-of-use assetsretained earnings in the period of adoption. The cumulative effect adjustment we recognized in the opening balance of retained earnings as of January 1, 2019 was not material. In addition, we elected the package of practical expedients permitted under the transition guidance within ASU No. 2016-02, which allows us to carry forward the historical lease determination, lease classification, and lease liabilities on our balance sheet for operating leases for certain property and equipment, including rail car leases and barge tow charters that are utilized for the distributionassessment of our products.initial direct costs. See Note 23—24—Leases for additional information.
Recently Issued Pronouncement
In October 2016,December 2019, the FASBFinancial Accounting Standards Board issued ASU No. 2016-16,2019-12, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, which requires an entitySimplifying the Accounting for Income Taxes. This ASU adds new guidance to recognizesimplify accounting for income taxes, changes the accounting for certain income tax consequences of an intra-entity transfer of an asset other than inventory whentransactions and makes minor improvements to the transfer occurs.codification. The amendments are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, and should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We adopted ASU No. 2016-16 on January 1, 2018. The adoption of ASU No. 2016-16 did not have a material impact on our consolidated financial statements.
In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which will change the presentation of net benefit cost related to employer sponsored defined benefit plans and other postretirement benefits. Service cost will be included within the same income statement line item as other compensation costs arising from services rendered during the period, while other components of net benefit cost will be presented separately outside of operating income. Additionally, only service costs may be capitalized on the balance sheet. This ASU is effective for annual and interim periods beginning after December 15, 2017. On January 1, 2018, we adopted ASU No. 2017-07 retrospectively for the income statement classification requirements and prospectively for the capitalization guidance. The adoption of ASU No. 2017-07 did not have a material impact on our consolidated financial statements.

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In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which improves the financial reporting of hedging relationships in order to better portray the economic results of an entity's risk management activities in its financial statements. The amendments are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, and should be applied to existing hedging relationships as of the date of adoption.2020. We do not expect theour adoption of this ASU on January 1, 2021 will have a material effect on our consolidated financial statements.
In February
4.   Revenue Recognition
Our performance obligations under a customer contract correspond to each shipment of product that we make to our customer under the contract. As a result, each contract may have more than one performance obligation based on the number of products ordered, the quantity of product to be shipped and the mode of shipment requested by the customer. When we enter into a contract with a customer, we are obligated to provide the product in that contract during a mutually agreed upon time period. Depending on the terms of the contract, either we or the customer arranges delivery of the product to the customer’s intended destination. When we arrange delivery of the product and control of the product transfers upon loading, we recognize freight revenue, which was not material for 2020, 2019 or 2018.
Certain of our contracts require us to supply products on a continuous basis to the customer. We recognize revenue on these contracts based on the quantity of products transferred to the customer during the period. For 2020, 2019 and 2018, the FASB issued ASU No. 2018-2, Reclassificationtotal amount of Certain Tax Effectsrevenue for these contracts was $44 million, $55 million and $85 million, respectively.
From time to time, we will enter the marketplace to purchase product in order to satisfy the obligations of our customer contracts. When we purchase product for this purpose, we are the principal in the transaction and recognize revenue on a gross basis. As discussed in Note 8—Equity Method Investment, we have transactions in the normal course of business with PLNL, reflecting our obligation to purchase 50% of the ammonia produced by PLNL at current market prices. Other than products
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purchased from Accumulated Other Comprehensive Income.PLNL, products purchased in the marketplace in order to satisfy the obligations of our customers were not material during 2020, 2019 or 2018.
Transaction Price
We agree with our customers on the selling price of each transaction. This ASU allows a reclassificationtransaction price is generally based on the product, market conditions, including supply and demand balances, freight arrangements including where control transfers, and customer incentives. In our contracts with customers, we allocate the entire transaction price to the sale of product to the customer, which is the basis for the determination of the relative standalone selling price allocated to each performance obligation. Any sales tax, value added tax, and other tax we collect concurrently with our revenue-producing activities are excluded from accumulated other comprehensive incomerevenue. Returns of our product by our customers are permitted only when the product is not to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018 and for interim periods therein. Early adoption of this ASU is permitted. specification. Returns were not material during 2020, 2019 or 2018.
We offer cash incentives to certain customers that do not expectprovide an option to the adoptioncustomer for additional product. Accrual of this ASUthese incentives involves the use of estimates, including how much product the customer will havepurchase and whether the customer will achieve a material effectcertain level of purchases within the incentive period. The balances of customer incentives accrued at December 31, 2020 and 2019 were not material.
Revenue Disaggregation
We track our revenue by product and by geography. See Note 21—Segment Disclosures for our revenue by reportable segment, which are ammonia, granular urea, UAN, AN and Other. The following table summarizes our revenue by product and by geography (based on destination of our shipment) for 2020, 2019 and 2018:
 AmmoniaGranular
Urea
UANANOtherTotal
 (in millions)
Year ended December 31, 2020     
North America$874 $1,183 $998 $197 $235 $3,487 
Europe and other146 65 65 258 103 637 
Total revenue$1,020 $1,248 $1,063 $455 $338 $4,124 
     
Year ended December 31, 2019
North America$948 $1,269 $1,176 $200 $256 $3,849 
Europe and other165 73 94 306 103 741 
Total revenue$1,113 $1,342 $1,270 $506 $359 $4,590 
Year ended December 31, 2018
North America$883 $1,243 $1,047 $186 $261 $3,620 
Europe and other145 79 187 274 124 809 
Total revenue$1,028 $1,322 $1,234 $460 $385 $4,429 
Accounts Receivable and Customer Advances
Our customers purchase our products through sales on credit or forward sales. Products sold to our customers on credit are recorded as accounts receivable when the customer obtains control of the product. Customers that purchase our products on credit are required to pay in accordance with our customary payment terms, which are generally less than 30 days. For 2020, 2019 and 2018, the amount of customer bad debt expense recognized was immaterial.
For forward sales, the customer prepays a portion of the value of the sales contract prior to obtaining control of the product. These prepayments, when received, are recorded as customer advances and are recognized as revenue when the customer obtains control of the product. Forward sales are customarily offered for periods of less than one year in advance of when the customer obtains control of the product.
As of December 31, 2020 and 2019, we had $130 million and $119 million, respectively, in customer advances on our consolidated financial statements. See Note 9—Income Taxesbalance sheets. The increase in the balance of customer advances was due primarily to an increase in forward contracts amidst an increasing price environment. During 2020, all of our customer advances that were recorded as of December 31, 2019 were recognized as revenue.
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We have certain customer contracts with performance obligations where if the customer does not take the required amount of product specified in the contract, then the customer is required to make a payment to us, which may vary based upon the terms and conditions of the applicable contract. As of December 31, 2020, excluding contracts with original durations of less than one year, and based on the minimum product tonnage to be sold and current market price estimates, our remaining performance obligations under these contracts are approximately $867 million. We expect to recognize approximately 31% of these performance obligations as revenue in 2021, approximately 42% as revenue during 2022 and 2023, approximately 23% as revenue during 2024 and 2025, and the remainder thereafter. If these customers do not fulfill their contractual obligations under such contracts, the legally enforceable minimum amount that they would pay to us under these contracts is approximately $212 million as of December 31, 2020. Other than the performance obligations described above, any performance obligations with our customers that were unfulfilled or partially filled at December 31, 2020 will be satisfied in 2021.
All of our contracts require that the period between the payment for additional information.goods and the transfer of those goods to the customer occur within normal contractual terms that do not exceed one year; therefore, we have not adjusted the transaction price of any of our contracts to recognize a significant financing component. We have also expensed any incremental costs associated with obtaining a contract that has a duration of less than one year, and there were no costs capitalized during 2020, 2019 or 2018.
4.5.   Net Earnings (Loss) Per Share
Net earnings (loss) per share were computed as follows:
 Year ended December 31,
 202020192018
 (in millions, except per share amounts)
Net earnings attributable to common stockholders$317 $493 $290 
Basic earnings per common share:
Weighted-average common shares outstanding214.9 220.2 232.6 
Net earnings attributable to common stockholders$1.48 $2.24 $1.25 
Diluted earnings per common share:
Weighted-average common shares outstanding214.9 220.2 232.6 
Dilutive common shares—stock-based awards0.3 1.4 1.2 
Diluted weighted-average shares outstanding215.2 221.6 233.8 
Net earnings attributable to common stockholders$1.47 $2.23 $1.24 
 Year ended December 31,
 2017 2016 2015
 (in millions, except per share amounts)
Net earnings (loss) attributable to common stockholders$358
 $(277) $700
Basic earnings per common share: 
  
  
Weighted-average common shares outstanding233.5
 233.1
 235.3
Net earnings (loss) attributable to common stockholders$1.53
 $(1.19) $2.97
Diluted earnings per common share: 
  
  
Weighted-average common shares outstanding233.5
 233.1
 235.3
Dilutive common shares—stock options0.4
 
 0.8
Diluted weighted-average shares outstanding233.9
 233.1
 236.1
Net earnings (loss) attributable to common stockholders$1.53
 $(1.19) $2.96
Dilutive earnings per share is calculated using weighted-average common shares outstanding, including the dilutive effect of stock-based awards as determined under the treasury stock method. In the computation of diluted earnings per common share, potentially dilutive stock optionsstock-based awards are excluded if the effect of their inclusion is anti-dilutive. Shares for anti-dilutive stock optionsstock-based awards not included in the computation of diluted earnings per common share were 3.73.3 million, 4.91.4 million and 1.61.5 million for the years ended December 31, 2017, 20162020, 2019 and 2015,2018, respectively.

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5.6.   Property, Plant and Equipment—Net
Property, plant and equipment—net consists of the following:
December 31, December 31,
2017 2016 20202019
(in millions) (in millions)
Land$71
 $69
Land$68 $71 
Machinery and equipment12,070
 11,664
Machinery and equipment12,539 12,338 
Buildings and improvements882
 878
Buildings and improvements895 890 
Construction in progress223
 280
Construction in progress275 236 
Property, plant and equipment(1)
13,246
 12,891
Property, plant and equipment(1)
13,777 13,535 
Less: Accumulated depreciation and amortization4,071
 3,239
Less: Accumulated depreciation and amortization6,145 5,365 
Property, plant and equipment—net$9,175
 $9,652
Property, plant and equipment—net$7,632 $8,170 


(1)As of December 31, 2020 and 2019, we had property, plant and equipment that was accrued but unpaid of approximately $43 million and $42 million, respectively.
(1)

As of December 31, 2017 and 2016, we had property, plant and equipment that was accrued but unpaid of approximately $46 million and $225 million, respectively. These amounts included accruals related to our capacity expansion projects of $185 million as of December 31, 2016.
Depreciation and amortization related to property, plant and equipment was $848$876 million, $607$855 million and $444$865 million in 2017, 20162020, 2019 and 2015,2018, respectively.
In 2019, we sold our Pine Bend dry bulk storage and logistics facility in Minnesota, received proceeds of $55 million and recognized a pre-tax gain of $45 million. The gain is reflected in other operating—net in our consolidated statement of operations for the year ended December 31, 2019.
Plant turnarounds—Scheduled inspections, replacements and overhauls of plant machinery and equipment at our continuous process manufacturing facilities during a full plant shutdown are referred to as plant turnarounds. The expenditures related to turnarounds are capitalized in property, plant and equipment when incurred. The following is a summary of capitalized plant turnaround costs:
Year ended December 31, Year ended December 31,
2017 2016 2015 202020192018
(in millions) (in millions)
Net capitalized turnaround costs at beginning of the year$206
 $220
 $153
Net capitalized turnaround costs at beginning of the year$246 $252 $208 
Additions100
 74
 135
Additions84 102 156 
Depreciation(102) (89) (65)Depreciation(104)(112)(111)
Effect of exchange rate changes4
 1
 (3)Effect of exchange rate changes(1)
Net capitalized turnaround costs at end of the year$208
 $206
 $220
Net capitalized turnaround costs at end of the year$226 $246 $252 
Scheduled replacements and overhauls of plant machinery and equipment include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors, heat exchangers and the replacement of catalysts when a full plant shutdown occurs. Scheduled inspections are also conducted during full plant shutdowns, including required safety inspections which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications. Internal employee costs and overhead amounts are not considered turnaround costs and are not capitalized.

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6.7.  Goodwill and Other Intangible Assets
The following table shows the carrying amount of goodwill by reportable segment as of December 31, 20172020 and 2016:2019:
 Ammonia Granular Urea UAN AN Other Total
 (in millions)
Balance as of December 31, 2016$585
 $828
 $576
 $286
 $70
 $2,345
Effect of exchange rate changes2
 1
 
 20
 3
 26
Balance as of December 31, 2017$587
 $829
 $576
 $306
 $73
 $2,371
AmmoniaGranular UreaUANANOtherTotal
(in millions)
Balance as of December 31, 2019$587 $828 $576 $302 $72 $2,365 
Effect of exchange rate changes
Balance as of December 31, 2020$587 $828 $576 $310 $73 $2,374 
All of our identifiable intangible assets have definite lives and are presented in other assets on our consolidated balance sheets at gross carrying amount, net of accumulated amortization, as follows:
 December 31, 2020December 31, 2019
 Gross
Carrying
Amount
Accumulated
Amortization
NetGross
Carrying
Amount
Accumulated
Amortization
Net
 (in millions)
Customer relationships$133 $(52)$81 $131 $(45)$86 
Trade names32 (9)23 31 (7)24 
Total intangible assets$165 $(61)$104 $162 $(52)$110 
 December 31, 2017 December 31, 2016
 Gross
Carrying
Amount
 Accumulated
Amortization
 Net Gross
Carrying
Amount
 Accumulated
Amortization
 Net
 (in millions)
Intangible assets: 
  
  
  
  
  
Customer relationships$132
 $(31) $101
 $125
 $(24) $101
TerraCair brand10
 (10) 
 10
 (10) 
Trade names32
 (4) 28
 29
 (2) 27
Total intangible assets$174
 $(45) $129
 $164
 $(36) $128
Amortization expense of our identifiable intangibles was $9 million, $7 million and $10 million for the years ended December 31, 2017, 2016 and 2015, respectively. Our intangible assets are being amortized over a weighted-average life of approximately 20 years.
Amortization expense of our identifiable intangibles was $8 million, $8 million and $7 million for the years ended December 31, 2020, 2019 and 2018, respectively. The gross carrying amount and accumulated amortization of our intangible assets are also impacted by the effect of exchange rate changes. Total estimated amortization expense for each of the five succeeding fiscal years is as follows:
 Estimated
Amortization
Expense
 (in millions)
2021$
2022
2023
2024
2025
76
 Estimated
Amortization
Expense
 (in millions)
2018$8
20198
20208
20218
20228

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7.8.   Equity Method Investments
Operating Equity Method Investment
We have a 50% ownership interest in PLNL, which operates an ammonia production facility in the Republic of Trinidad and Tobago. We include our share of the net earnings from this equity method investment as an element of earnings from operations because PLNL provides additional production to our operations and is integrated with our other supply chain and sales activities in the ammonia segment.
As of December 31, 2017,2020, the total carrying value of our equity method investment in PLNL of approximately $108was $80 million, was $55$42 million more than our share of PLNL'sPLNL’s book value. The excess is attributable to the purchase accounting impact of our acquisition of the investment in PLNL and primarily reflects the revaluation of property, plant and equipment and the value of an exclusive natural gas contract.equipment. The increased basis for property, plant and equipment and the gas contract areis being amortized over a remaining period of approximately 15 years and 3 months, respectively.12 years. Our equity in earnings of PLNL is different from our ownership interest in income reported by PLNL due to amortization of thesethis basis differences.difference.
We have transactions in the normal course of business with PLNL reflecting our obligation to purchase 50% of the ammonia produced by PLNL at current market prices. Our ammonia purchases from PLNL totaled $76$57 million, $62$69 million and $121$86 million in 2017, 20162020, 2019 and 2015,2018, respectively.
The Trinidadian tax authority (the Board of Inland Revenue) issued a proposed tax assessment against PLNL with respect to tax years 2011 and 2012 in the amount of approximately $12 million. The proposed assessment asserted that PLNL should have withheld tax at a higher rate on dividends paid to its Trinidadian owners. The Board of Inland Revenue also would have assessed statutory interest and penalties on the amount of tax owed when a final assessment was issued for the tax years 2011 and 2012. As we own a 50% interest in PLNL, our effective share of any assessment that is determined to be a liability of PLNL would be 50%, which would be reflected as a reduction in our equity in earnings of PLNL.
During the third quarter of 2019, the Trinidadian government offered a tax amnesty period that provided taxpayers the opportunity to pay any prior year tax obligations and avoid accumulated interest or penalties. During the tax amnesty period, PLNL evaluated the proposed assessment, including considering the outcome of certain recent legal cases involving other taxpayers. As a result of this evaluation, in the third quarter of 2019, PLNL paid withholding tax to the Board of Inland Revenue under the amnesty program for tax years back to 2011, and recognized a charge for $32 million in the third quarter of 2019. Our 50% share of PLNL’s tax charge was $16 million, which reduced our equity in earnings of operating affiliate for 2019.
PLNL operates an ammonia plant that relies on natural gas supplied, under a Gas Sales Contract (the NGC Contract), by The National Gas Company of Trinidad and Tobago Limited (NGC). PLNL has experienced past curtailments in the supply of natural gas from NGC, which have reduced thehistorical ammonia production at PLNL. The NGC Contract had an initial expiration date of September 2018 and has beenwas extended on the same terms until September 2023. Any NGC commitment to supply gas beyond 2023 will need to be based on new agreementsagreements. In May 2018, the NGC and PLNL reached a settlement of an arbitration proceeding regarding volume and price. PLNL and NGC are currently parties to arbitration proceedings where the main issue remaining in dispute is PLNL'sPLNL’s claims for damages from thedue to natural gas supply curtailments.
Although PLNL believes its claims against NGC to be meritorious, it is not possible to predict the outcome The net after-tax impact of the arbitration. There are significant assumptions in the future operations of the joint venture, beyond 2023, that are uncertain at this time, including the quantities of gas thatsettlement reached between NGC will make available, the cost of such gas, the estimates that are used to determine the useful lives of fixed assets and the assumptions in the discounted cash flow models utilized for recoverability and impairment testing. As part of our impairment assessment of our equity method investment in PLNL during the fourth quarters of 2016 and 2015, we determined the carrying value exceeded the fair value and recognized a $134 million and $62 million impairment charge in 2016 and 2015, respectively. The carrying value of our equity method investment in PLNL at December 31, 2017 is $108 million. If NGC does not make sufficient quantities of natural gas available to PLNL at prices that permit profitable operations, PLNL may cease operating its facility and we would write off the remaining investment in PLNL.
The Trinidad tax authority (the Board of Inland Revenue) has issued a tax assessment against PLNL related to a dispute over whether tax depreciation must be claimed during a tax holiday period that was granted to PLNL under the Trinidad Fiscal Incentives Act. The tax holidayrecognized in our consolidated statement of operations for 2018 was granted as an incentive to construct PLNL’s ammonia plant. Based on the facts and circumstances of this matter, PLNL recorded a tax contingency accrualincrease in the second quarter of 2017, which reduced our equity in earnings of PLNL for 2017 byoperating affiliate of approximately $7 million reflecting our 50% ownership interest. In early 2018, PLNL settled this matter with the Board of Inland Revenue for the amounts accrued.$19 million.
In the fourth quarter of 2017, we sold our interest in a joint venture that owns a carbon dioxide liquefaction and purification facility and recognized a gain of $14 million, which is included in equity in earnings (losses) of operating affiliates in our consolidated statements of operations.
Non-Operating Equity Method Investments
We no longer have non-operating equity method investments as a result of the sale of our 50% ownership interest in KEYTRADE AG (Keytrade) during the second quarter of 2015 and our July 31, 2015 acquisition of the remaining 50% equity interest in CF Fertilisers UK not previously owned by us for total consideration of $570 million. As a result of the acquisition, CF Fertilisers UK became a wholly owned subsidiary. The financial results of CF Fertilisers UK have been consolidated within our financial results since July 31, 2015.
Equity in earnings of non-operating affiliates—net of taxes for the year ended December 31, 2015 of $72 million includes our after-tax gain of $94 million on remeasurement to fair value of our initial 50% equity interest in CF Fertilisers UK, the after-tax loss of $29 million on the sale of our interests in Keytrade, and our equity in earnings (losses) of Keytrade, through the date of sale, and of CF Fertilisers UK, through the acquisition date.



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8.9.   Fair Value Measurements
Our cash and cash equivalents and other investments consist of the following:
 December 31, 2020
 Cost BasisUnrealized
Gains
Unrealized
Losses
Fair Value
 (in millions)
Cash$108 $— $— $108 
Cash equivalents:
U.S. and Canadian government obligations552 — — 552 
Other debt securities23 — — 23 
Total cash and cash equivalents$683 $— $— $683 
Nonqualified employee benefit trusts16 19 
 December 31, 2017
 Cost Basis Unrealized
Gains
 Unrealized
Losses
 Fair Value
 (in millions)
Cash$120
 $
 $
 $120
Cash equivalents:       
U.S. and Canadian government obligations710
 
 
 710
Other debt securities5
 
 
 5
Total cash and cash equivalents$835
 $
 $
 $835
Nonqualified employee benefit trusts17
 2
 
 19
December 31, 2016 December 31, 2019
Cost Basis Unrealized
Gains
 Unrealized
Losses
 Fair Value Cost BasisUnrealized
Gains
Unrealized
Losses
Fair Value
(in millions) (in millions)
Cash$89
 $
 $
 $89
Cash$59 $— $— $59 
Cash equivalents:       Cash equivalents:
U.S. and Canadian government obligations1,075
 
 
 1,075
U.S. and Canadian government obligations211 — — 211 
Other debt securitiesOther debt securities17 — — 17 
Total cash and cash equivalents$1,164
 $
 $
 $1,164
Total cash and cash equivalents$287 $— $— $287 
Restricted cash5
 
 
 5
Nonqualified employee benefit trusts18
 1
 
 19
Nonqualified employee benefit trusts17 19 
Under our short-term investment policy, we may invest our cash balances, either directly or through mutual funds, in several types of investment-grade securities, including notes and bonds issued by governmental entities or corporations. Securities issued by governmental entities include those issued directly by the U.S. and Canadian federal governments; those issued by state, local or other governmental entities; and those guaranteed by entities affiliated with governmental entities.
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following tables present assets and liabilities included in our consolidated balance sheets as of December 31, 20172020 and 20162019 that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine such fair value:
December 31, 2017 December 31, 2020
Total Fair Value Quoted Prices
in Active
Markets
(Level 1)
 Significant
Other
Observable
Inputs
(Level 2)
 Significant
Unobservable
Inputs
(Level 3)
Total Fair ValueQuoted Prices
in Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
(in millions) (in millions)
Cash equivalents$715
 $715
 $
 $
Cash equivalents$575 $575 $$
Nonqualified employee benefit trusts19
 19
 
 
Nonqualified employee benefit trusts19 19 
Derivative assets1
 
 1
 
Derivative assets
Derivative liabilities(12) 
 (12) 
Derivative liabilities(7)(7)
Embedded derivative liability(25) 
 (25) 
Embedded derivative liability(18)(18)
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December 31, 2016 December 31, 2019
Total Fair Value Quoted Prices
in Active
Markets
(Level 1)
 Significant
Other
Observable
Inputs
(Level 2)
 Significant
Unobservable
Inputs
(Level 3)
Total Fair ValueQuoted Prices
in Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
(in millions) (in millions)
Cash equivalents$1,075
 $1,075
 $
 $
Cash equivalents$228 $228 $$
Restricted cash5
 5
 
 
Nonqualified employee benefit trusts19
 19
 
 
Nonqualified employee benefit trusts19 19 
Derivative assets56
 
 56
 
Derivative liabilities(6) 
 (6) 
Derivative liabilities(12)(12)
Embedded derivative liability(26) 
 (26) 
Embedded derivative liability(20)(20)
Cash Equivalents
As of December 31, 20172020 and 2016,2019, our cash equivalents consisted primarily of U.S. and Canadian government obligations and money market mutual funds that invest in U.S. government obligations and other investment-grade securities.
Restricted Cash
We maintained a cash account for which the use of the funds was restricted. The restricted cash account was put in place to satisfy certain requirements included in our engineering and procurement services contract for our capacity expansion projects. Under the terms of this contract, we were required to grant an affiliate of ThyssenKrupp Industrial Solutions a security interest in a restricted cash account. During 2017, the remaining balance in our restricted cash account was returned to us and the account was closed.
Nonqualified Employee Benefit Trusts
We maintain trusts associated with certain nonqualified supplemental pension plans. The investments are accounted for as available-for-sale securities. The fair values of the trust assets are based on daily quoted prices in an active market, which represents the net asset values of the shares held in the trusts. These trusts, and are included on our consolidated balance sheets in other assets. Debt securities are accounted for as available-for-sale securities and changes in fair value are reported in other comprehensive income. Changes in the fair value of available-for-sale equity securities in the trust assets are recognized through earnings.
Derivative Instruments
The derivative instruments that we may use are primarily natural gas fixed price swaps, basis swaps and natural gas options traded in the over-the-counter (OTC)OTC markets with multi-national commercial banks, other major financial institutions or large energy companies. The natural gas derivative contracts represent anticipated natural gas needs for future periods and settlements are scheduled to coincide with anticipated natural gas purchases during those future periods. The natural gas derivative contracts settle using primarily a NYMEX futures prices.price index. To determine the fair value of these instruments, we use quoted market prices from NYMEX and standard pricing models with inputs derived from or corroborated by observable market data such as forward curves supplied by an industry-recognized independent third party. See Note 14—15—Derivative Financial Instruments for additional information.
Embedded Derivative Liability
Under the terms of our strategic venture with CHS, if our credit rating as determined by two of three specified credit rating agencies is below certain levels, we are required to make a non-refundable yearly payment of $5 million to CHS. Since 2016, our credit ratings werehave been below certain levels in 2016 and, 2017,as a result, we made aan annual payment of $5 million to CHS in the fourth quarter of each year. These payments will continue on a yearly basis until the earlier of the date that our credit rating is upgraded to or above certain levels by two of the three specified credit rating agencies or February 1, 2026. This obligation is recognized on our consolidated balance sheets as an embedded derivative. As of December 31, 2017derivative and 2016, the embedded derivative liability of $25 million and $26 million, respectively, is included inwithin other current liabilities and other liabilities onliabilities. As of December 31, 2020 and 2019, the embedded derivative liability was $18 million and $20 million, respectively. Included in other operating—net in our consolidated balance sheets. statements of operations for the years ended December 31, 2020, 2019 and 2018 is a net loss of $3 million, $4 million and $1 million, respectively.
The inputs into the fair value measurement include the probability of future upgrades and downgrades of our credit rating based on historical credit rating movements of other public companies and the discount rates to be applied to potential annual payments based on applicable credit spreads of other public companies at different credit rating levels. Based on these inputs, our fair value measurement is classified as Level 2.
See Note 16—17—Noncontrolling Interests for additional information regarding our strategic venture with CHS.

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Financial Instruments
The carrying amounts and estimated fair value of our financial instruments are as follows:
 December 31,
 2017 2016
 Carrying
Amount
 Fair Value Carrying
Amount
 Fair Value
 (in millions)
Long-term debt$4,692
 $4,800
 $5,778
 $5,506
 December 31, 2020December 31, 2019
 Carrying
Amount
Fair ValueCarrying
Amount
Fair Value
 (in millions)
Long-term debt, including current maturities$3,961 $4,731 $3,957 $4,295 
The fair value of our long-term debt was based on quoted prices for identical or similar liabilities in markets that are not active or valuation models in which all significant inputs and value drivers are observable and, as a result, they are classified as Level 2 inputs.
The carrying amounts of cash and cash equivalents, as well as instruments included in other current assets and other current liabilities that meet the definition of financial instruments, approximate fair values because of their short-term maturities.
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
We also have assets and liabilities that may be measured at fair value on a nonrecurring basis; that is, the assets and liabilities are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances, such as when there is evidence of impairment, when there is allocation of purchase price in an acquisition or when a new liability is being established that requires fair value measurement. These include long-lived assets, goodwill and other intangible assets and investments in unconsolidated subsidiaries, such as equity method investments, which may be written down to fair value as a result of impairment. The fair value measurements related to each of these rely primarily on Company-specific inputs and the Company'sCompany’s assumptions about the use of the assets. Since certain of the Company’s assumptions would involve inputs that are not observable, these fair values would reside within Level 3 of the fair value hierarchy.
We review the carrying value of our goodwill, definite lived intangible assets, and investments in unconsolidated subsidiaries to assess recoverability as part of our annual impairment review in the fourth quarter of each year and more frequently if there is an event that requires reassessment during the year. As part of the assessment process when performing impairment tests, we estimate many factors including future production and sales volume,volumes, selling prices, raw materials costs, operating rates, operating expenses, inflation, discount rates, exchange rates, tax rates and capital spending. The assumptions we make are material estimates that are used in the impairment testing.
Our equity method investment in the Republic of Trinidad and Tobago, PLNL, operates an ammonia plant that relies on natural gas supplied by NGC pursuant to the NGC Contract. As part of our impairment assessment of our equity method investment in PLNL during the fourth quarter of 2016, we determined the carrying value exceeded the fair value and recognized a $134 million impairment charge in 2016. Previously, in 2015, we recognized an impairment charge of $62 million related to our equity method investment in PLNL. See Note 7—Equity Method Investments for additional information.

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9.10.   Income Taxes
On December 22, 2017,Income Tax Provision
The components of earnings before income taxes and the components of our income tax provision are as follows:
 Year ended December 31,
 202020192018
 (in millions)
Domestic$421 $679 $516 
Non-U.S. 42 93 31 
Earnings before income taxes$463 $772 $547 
Current   
Federal$106 $$
Foreign21 14 
State(7)(48)
105 (23)25 
Deferred   
Federal(76)112 85 
Foreign(10)
State(2)37 
(74)149 78 
Income tax provision before Tax Reform31 126 103 
Tax Reform - Current
Federal19 
Foreign
State(3)
Income tax provision - Tax Reform16 
Income tax provision$31 $126 $119 
Terra Amended Tax Returns
We completed the acquisition of Terra Industries Inc. (Terra) in April 2010. After the acquisition, we determined that the manner in which Terra reported the repatriation of cash from foreign affiliates to its U.S. parent for U.S. and foreign income tax purposes was not appropriate. As a result, in 2012 we amended certain tax returns, including Terra’s income and withholding tax returns, back to 1999 (the Amended Tax Returns) and paid additional income and withholding taxes, and related interest and penalties. In early 2013, the Internal Revenue Service (IRS) commenced an examination of the U.S. government enactedtax aspects of the Amended Tax Returns. In 2017, we also made a Voluntary Disclosure Filing with the Canadian Revenue Agency (CRA) with respect to the Canadian tax aspects of this matter and paid additional Canadian taxes due.
In early 2019, the IRS completed its examination of the Amended Tax Returns and submitted its audit reports and related refund claims to the Joint Committee on Taxation of the U.S. Congress (the Joint Committee). For purposes of its review, the Joint Committee separated the IRS audit reports into two separate matters: (i) an income tax related matter and (ii) a withholding tax matter. In late 2019, we received notification that the Joint Committee had approved the IRS audit reports and related income tax refunds relating to the income tax related matter. As a result of the approval by the Joint Committee, we recognized in the fourth quarter of 2019 the following amounts in our consolidated statement of operations; (i) $5 million of interest income ($4 million, net of tax); and (ii) a reduction in income tax expense of $10 million as a result of the favorable settlement of certain uncertain tax positions. No income tax refunds were received in 2019 related to the Amended Tax Returns.
In 2020, we received notification that the Joint Committee approved the IRS audit report and related withholding tax refunds relating to the withholding tax matter and we received IRS Notices indicating the amount of tax and interest to be refunded and received with respect to the withholding tax matter and the income tax matter. In addition, the CRA settled with us the Voluntary Disclosure matter.
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In 2020, as a result of these events, we recognized $26 million of interest-related income and $18 million of income tax benefit, which consisted of the following:
additional income of $26 million ($23 million, net of tax) representing $16 million of interest income related to the U.S. Federal income tax matter and withholding tax matter and a $10 million reversal of previously accrued interest related to the Canadian tax aspects of this matter,
a reduction in our liabilities for unrecognized tax benefits of $12 million with a corresponding reduction in income tax expense related to the U.S. Federal withholding tax matter, and
an additional income tax benefit of $9 million related to the U.S. Federal income tax matter and related state amended returns.
In 2020, we received U.S. Federal income tax refunds, including interest, of $110 million relating to the Amended Tax Returns, consisting of $68 million related to the income tax matter and $42 million related to the withholding tax matter, which finalized these matters with the IRS. As a result of the finalization of the income tax matter and the withholding tax matter, all U.S. federal tax years commencing before January 1, 2012 are now closed.
In the first quarter of 2021, we received approximately $20 million of withholding tax refunds, including interest, from the CRA, related to the Voluntary Disclosure Filing. These amounts were previously recorded in our consolidated balance sheet as of December 31, 2020.
Canada Revenue Agency Notices of Reassessment
In 2016, the Canada Revenue Agency (CRA) issued Notices of Reassessment for tax years 2006 through 2009 to one of our Canadian affiliates asserting a disallowance of certain patronage allocations. The tax assessments totaled CAD $174 million (or approximately $137 million), including provincial taxes but excluding any interest or penalties. We filed a Notice of Objection with respect to the Notices of Reassessment with the CRA and Alberta Tax and Revenue Administration and we posted letters of credit in lieu of paying the additional tax liability assessed. In 2018, the matter was accepted for consideration under the bilateral settlement provisions of the US-Canada Tax Treaty (the Treaty) by the United States and Canadian competent authorities and was subject to a two-year period to reach a settlement. The period was subsequently extended, but it expired in February 2021 and the matter is being referred to binding arbitration under the provisions of the Treaty.
While there is uncertainty about the ultimate timing and outcome of this matter, which may be resolved in binding arbitration, we do not expect that resolution of the matter will result in a material net tax liability, because the Company would be entitled to an offsetting U.S. foreign tax credit for any incremental Canadian tax paid. Upon resolution of the matter, interest would be assessed based upon the amount of tax due. Similarly, the Company would be entitled to receive interest on the offsetting reduction in tax due to the foreign tax credit. Due to uncertainty in how each taxing authority would apply their interest calculation rules, we are not able to predict the net amount of interest that we would pay to or receive from the taxing authorities.
Tax Reform
The Tax Cuts and Jobs Act (the "Tax Act"“Tax Act” or "Tax Reform"“Tax Reform”). The impact of this new legislation is included in the period of enactment in accordance with U.S. GAAP. The most significant impact of this legislation to us is the revaluation of our deferred taxes as a result of the reduction in the federal tax rate from 35% to 21%, which is effective was enacted on January 1, 2018. TheDecember 22, 2017. Among other provisions, the Tax Act also imposesimposed a transition tax liability on our previously untaxedtaxpayers with undistributed foreign earnings that is payable over an eight-year period beginningentity earnings. In 2018, we recorded a $16 million increase to the provisional amount of the transition tax liability. The adjustment to the provisional amount was required to properly reflect the inclusion of amounts subject to the transition tax in 2018.tax returns where the amounts were to be reported. The adjustment related to changes in (i) the amount recorded inof includible income subject to the periodtransition tax; (ii) the computation of enactment forthe allowable foreign tax credits against the transition tax liability representsand (iii) the allocation of certain gains and losses to various foreign tax credit baskets. The adjustment to the provisional amount represented an approximate 3 percentage point increase to our current estimate ofeffective tax rate for the provisions of theyear ended December 31, 2018.
The Tax Act andalso provided a new category of income from foreign operations, Global Intangible Low-Taxed Income (GILTI), that was subject to federal income tax beginning in the year ended December 31, 2018. The U.S. tax on foreign earnings in the effective tax rate table below includes our tax on GILTI, which is a provisional amount based on amounts reasonably estimable. See further discussion belowprimarily related to this estimate, which may be adjusted as more information becomes available prior to the end of the one-year measurement period in December 2018.
The components of (loss) earnings before income taxes and equity in earnings of non-operating affiliates are as follows:Canadian earnings.
82
 Year ended December 31,
 2017 2016 2015
 (in millions)
Domestic$(186) $(43) $1,031
Non-U.S. 61
 (183) 27
 $(125) $(226) $1,058
The components of the income tax (benefit) provision are as follows:
 Year ended December 31,
 2017 2016 2015
 (in millions)
Current 
  
  
Federal$(43) $(795) $258
Foreign19
 11
 20
State(6) (23) 39

(30) (807) 317
Deferred 
  
  
Federal(44) 761
 76
Foreign(3) (1) (13)
State(7) (21) 16
 (54) 739
 79
Income tax (benefit) provision before Tax Reform(84) (68) 396
      
Tax Reform - Current     
Federal54
 
 
Foreign
 
 
State3
 
 
 57
 
 
Tax Reform - Deferred     
Federal(548) 
 
Foreign
 
 
State
 
 
 (548) 
 
Income tax benefit - Tax Reform(491) 
 
Income tax (benefit) provision$(575) $(68) $396

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COVID-19 Tax Legislation
Our preliminary estimateIn March 2020, the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act) was signed into law. The CARES Act includes, among other things, a five-year net operating loss (NOL) carryback (including a related technical correction to the 2017 Tax Cuts and Jobs Act) for tax losses incurred in tax years 2018 through 2020, a change in interest deduction limitations for tax years 2019 and 2020, increasing the annual interest limitation from 30% to 50% of adjusted taxable income and increased refundability of corporate alternative minimum tax (AMT) credits. These provisions have limited applicability to the Company.
On December 27, 2020, the Consolidated Appropriations Act, 2021 (the CAA) was signed into law. The CAA extends certain provisions of the transitionCARES Act, provides additional funding for others and contains new relief provisions. The tax liability resulting fromprovisions within this legislation will not have a significant effect on the Company.
We continue to monitor and assess the impact of tax legislation related to COVID-19 in all tax jurisdictions in which we operate.
Effective Tax Act could be impacted by further regulatory or other government guidance relating to provisions of existing laws or the Tax Act. If more information becomes available to cause our provisional amount to change, we will adjust our liability within the measurement period ending in December 2018.Rate
Differences in the expected income tax (benefit) provision based on statutory rates applied to (loss) earnings before income taxes and the income tax (benefit) provision reflected in the consolidated statements of operations are summarized below:
below.
Year ended December 31,
Year ended December 31, 202020192018
2017 2016 2015 (in millions, except percentages)
(in millions, except percentages)
(Loss) earnings before income taxes and equity in earnings of non-operating affiliates$(125) $(226) $1,058
Expected tax (benefit) provision at U.S. statutory rate of 35%(44) (79) 370
Earnings before income taxesEarnings before income taxes$463 $772 $547 
Expected tax provision at U.S. statutory rate of 21%Expected tax provision at U.S. statutory rate of 21%$97 $162 $115 
State income taxes, net of federal(21) (33) 32
State income taxes, net of federal(1)
Net earnings attributable to noncontrolling interests(32) (42) (12)Net earnings attributable to noncontrolling interests(24)(32)(29)
U.S. manufacturing profits deduction6
 39
 (17)
Foreign tax rate differential(6) 30
 (17)Foreign tax rate differential
U.S. tax on foreign earnings1
 (10) 
U.S. tax on foreign earnings(6)12 
Foreign partnership basis differenceForeign partnership basis difference(7)
Valuation allowance(3) 50
 16
Valuation allowance
Non-deductible capital costs
 (17) 18
Tax rate change17
 
 
Tax rate change(2)
Terra amended tax returnsTerra amended tax returns(24)(10)
Other(2) (6) 6
Other(5)(1)
U.S. enacted tax rate change (Tax Reform)(552) 
 
Transition tax liability and other (Tax Reform)61
 
 
Income tax (benefit) provision$(575) $(68) $396
Transition tax liability (Tax Reform)Transition tax liability (Tax Reform)16 
Income tax provisionIncome tax provision$31 $126 $119 
Effective tax rate457.2% 30.0% 37.4%Effective tax rate6.7 %16.3 %21.7 %
     
Income tax (benefit) provision before Tax Reform(1)
$(84) $(68) $396
Income tax provision before Tax Reform(1)
Income tax provision before Tax Reform(1)
$31 $126 $103 
Effective tax rate before Tax Reform67.0% 30.0% 37.4%Effective tax rate before Tax Reform6.7 %16.3 %18.7 %

(1)Income tax (benefit) provision before Tax Reform reflects the income tax (benefit) provision less the Tax Reform impactsimpact included in the table above consisting of U.S. enacted tax rate change (Tax Reform) andthe transition tax liability and other.liability.
On April 2, 2018, we acquired the TNCLP Public Units. Our effective tax rate isin 2018 was impacted by earnings attributablea $16 million reduction to noncontrolling interests in CFN for 2017 and 2016 and TNCLP for 2017, 2016 and 2015, as our consolidated incomedeferred tax (benefit) provision does not include a tax provision on the earnings attributable to the noncontrolling interests. As a result, earnings attributable to the noncontrolling interests of $92 million, $119 million and $34 million in 2017, 2016 and 2015, respectively, which are included in (loss) earnings before income taxes and equity in earnings of non-operating affiliates, impact the effective tax rate in all three years. See Note 16—Noncontrolling Interests for additional information.
We recorded a tax receivable of approximately $22 million as a result of our intention to carryback the tax net operating loss for the year ended December 31, 2017 to prior tax years. As a result of the carryback, the income tax provision for the tax year ended December 31, 2017 includes the tax impact of the recaptured U.S. manufacturing profits deductions claimed in prior years that will not be deductible. The tax receivable from the net operating loss carryback has been reduced by an alternative minimum tax of $36 million in the carryback periods. The alternative minimum tax that would be incurredliability as a result of the carryback of the net operating loss will become a refundable tax credit as a result of the impact of the Tax Act. These refundable tax credits are available for tax years subsequent to the tax year ended December 31, 2017 and are recordedchange in our noncurrent tax receivable. The $22 million tax receivable for the net operating loss carryback is included in prepaid income taxes on our consolidated balance sheet as of December 31, 2017.
A federal income tax benefit of $145 million ($242 million before the impact of the Tax Act) was recorded for the amount of the net operating loss for the tax year ended December 31, 2017 that will carryforward to subsequent tax years. The net operating loss carryforward is approximately $692 million and is available until the tax year 2037.

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State income taxes for the year ended December 31, 2017 and December 31, 2016 includes a tax benefit of $30 million and $46 million respectively, net of federal tax effect, for state net operating loss carryforwards.
State income taxes for the year ended December 31, 2016 were impacted by investment tax credits of $13 million, net of federal tax effect, related to capital assets placed in service at our production facilities in Oklahoma that are indefinitely available to offset income taxes in that jurisdiction in future years. Our effective state income tax rate was also reduced as a resultdue to the implementation of the changes to our legal entity structure effected inchanges related to the first quarter of 2016 as part of our strategic venture with CHS.acquisition. See Note 16—17—Noncontrolling Interests for additional information.
The income tax provision for the tax year ended December 31, 2016 includes the tax impact of the U.S. manufacturing profits deductions claimed in prior years that will not be deductible as a result of the carryback of the tax net operating loss for the year ended December 31, 2016.
Non-deductible capital costs for the tax year ended December 31, 2016 include certain transaction costs capitalized in the prior year that are now deductible as a result of the termination of the proposed combination with certain businesses of OCI N.V. (OCI).
The foreign tax rate differential is impacted by the inclusion of equity earnings from our equity method investment in PLNL, a foreign operating affiliate, which are included in pre-tax earnings on an after-tax basis andbasis. In 2020, the foreign tax effectrate differential includes $6 million tax expense for the revaluing of net operating lossesdeferred taxes due to an enacted rate change in the jurisdiction of a foreign subsidiaryaffiliate.
U.S. tax on foreign earnings for the year ended December 31, 2020 is inclusive of the Companycurrent year tax on global intangible low-tax income (GILTI), benefit from the Section 250 deduction and foreign tax credits, as well as adjustments to prior year amounts for which a valuation allowance has been recorded. We determinedthese items recorded upon filing the carrying value of our equity method investment in PLNL exceeded fair value and recognized an impairment of our equity method investment in PLNL of $134 millionU.S. federal return in the fourth quarter of 20162020.
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Our effective tax rate is impacted by earnings attributable to noncontrolling interests in CFN and, $62 million in the fourth quarter of 2015. The impairments are included in equity in earnings of operating affiliates. Ourprior to April 2, 2018, TNCLP, as our consolidated income tax provisions doprovision does not include a tax benefit forprovision on the impairmentearnings attributable to the noncontrolling interests. As a result, earnings attributable to the noncontrolling interests of our equity method investment as$115 million, $153 million and $138 million in 2020, 2019 and 2018, respectively, which are included in earnings before income taxes, impacted the impairment does not give rise to aeffective tax deduction.rate in all three years. See Note 7—Equity Method Investments17—Noncontrolling Interests for additional information.
Foreign subsidiaries of the Company have incurred capital losses of $116 million that are indefinitely available to offset capital gains in the applicable foreign jurisdictions. As the future realization of these carryforwards is not anticipated, a valuation allowance of $29 million was recorded in the year ended December 31, 2016.
The foreign tax rate differential for the tax year ended December 31, 2016 includes a $5 million deferred tax benefit for an enacted tax rate change.Deferred Taxes
Deferred tax assets and deferred tax liabilities are as follows:
 December 31,
 2017 2016
 (in millions)
Deferred tax assets: 
  
Net operating loss and capital loss carryforwards$359
 $187
Retirement and other employee benefits67
 118
Unrealized loss on hedging derivatives6
 9
Intangible asset5
 34
Other115
 140
 552
 488
Valuation allowance(156) (159)
 396
 329
Deferred tax liabilities: 
  
Depreciation and amortization(256) (329)
Investments in partnerships(1,151) (1,582)
Foreign earnings(28) (28)
Unrealized gain on hedging derivatives
 (16)
Other(8) (4)
 (1,443) (1,959)
Net deferred tax liability$(1,047) $(1,630)

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Investments in partnerships in the table above reflects the deferred tax liability for our investments in CFN and TNCLP. These amounts were previously presented in the corresponding deferred tax asset and liability amounts; therefore, the amounts representing the deferred tax liability for our investments in partnerships as of December 31, 2016 have been reclassified to the investments in partnerships to conform to the current year presentation.
A foreign subsidiary of the Company has net operating loss carryforwards of $383 million that are indefinitely available in the foreign jurisdiction. As the future realization of these carryforwards is not anticipated, a valuation allowance of $100 million has been recorded. Of this amount, $11 million and $17 million were recorded as valuation allowances in the years ended December 31, 2017 and 2016, respectively.
 December 31,
 20202019
 (in millions)
Deferred tax assets:  
Net operating loss and capital loss carryforwards$194 $108 
Retirement and other employee benefits69 71 
State tax credits69 72 
Operating lease liabilities61 66 
Other23 61 
416 378 
Valuation allowance(157)(60)
259 318 
Deferred tax liabilities:
Depreciation and amortization(204)(276)
Investments in partnerships(1,173)(1,217)
Operating lease right-of-use assets(60)(65)
Other(6)(6)
(1,443)(1,564)
Net deferred tax liability$(1,184)$(1,246)
We consider the earnings of certain of our Canadian operatingUnited Kingdom subsidiaries to not be permanently reinvested and we recognize a deferred tax liability for the future repatriation of these earnings, as they are earned.reinvested. As of December 31, 2017,2020, we have recorded a deferred income tax liability of approximately $28 million, which reflects thewould not expect any additional U.S. and foreign income taxestax that would be due upon the repatriation of thethese accumulated earnings, other than foreign withholding tax, which we have not accrued.
During 2019, as a result of group legal entity reorganizations, foreign net operating loss carryforwards were eliminated, which resulted in a net decrease of $99 million in the net operating loss carryforwards deferred tax asset. We recorded a corresponding reduction in the related valuation allowance of $99 million as these losses were not anticipated to be realized. The valuation allowance activity in the current year is primarily attributable to a capital loss. As a result of an intercompany transaction with a foreign affiliate, we recognized a capital loss which will be carried forward and for which we recorded a deferred tax asset of approximately $90 million. The foreign affiliate operations do not normally generate capital gains and there is no practical plan to do so in the future, therefore, we established a full valuation allowance of approximately $90 million against the deferred tax asset. As of December 31, 2020, our net operating loss and capital loss carryforwards are comprised of state net operating loss carryforwards with expiration dates generally ranging from 2027 to 2037 and foreign capital loss carryforwards, which can be carried forward indefinitely. Our foreign affiliates, including the foreign affiliate described above, have operations that do not normally generate capital gains and have no practical plans to do so in the future. As a result, we have recorded a full valuation allowance against all foreign capital loss carryforwards.
As of December 31, 2020, we have state tax credit carryforwards resulting in a deferred tax asset of $69 million. The state tax credits have expiration dates generally ranging from 2033 to 2040. We have recorded a $27 million valuation allowance on the portion of the state tax credits that are not expected to be realized before they expire based on taxable income projections.
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Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
 December 31,
 20202019
 (in millions)
Unrecognized tax benefits:
Balance as of January 1$104 $126 
Additions for tax positions taken during the current year
Additions for tax positions taken during prior years22 
Reductions related to lapsed statutes of limitations
Reductions related to settlements with tax jurisdictions(23)(44)
Balance as of December 31$81 $104 
Our effective tax rate would be affected by $37 million if these unrecognized tax benefits were to be recognized in the future.
In 2020, as a result of the settlement and finalization of carryover impacts of the Terra Amended Tax Returns on other tax periods, we reduced our liability for unrecognized tax benefits by $19 million and recorded a corresponding deferred income tax liability. In addition, we reduced our liabilities for unrecognized tax benefits by $4 million with a corresponding reduction in income tax provision.
In 2019, we increased the amount of our non-U.S. subsidiaries that are consideredunrecognized tax benefits by $22 million. The increase primarily related to not be permanently reinvested.an addition for state investment tax credits. In addition, we reduced the amount of our unrecognized tax benefits in 2019 by $44 million. This reduction primarily related to the approval by the Joint Committee of the IRS audit report related to the Terra Amended Tax Returns described above.
We file federal, provincial, state and local income tax returns principally in the United States, Canada and the United Kingdom, as well as in certain other foreign jurisdictions. In general, filed tax returns remain subject to examination by United States tax jurisdictions for years 19992012 and thereafter, by Canadian tax jurisdictions for years 2006 and thereafter, and by United Kingdom tax jurisdictions for years 20152018 and thereafter. Our income tax liability or transition tax expense could be impacted by the finalization of currently on-going U.S. or foreign income tax audits of prior tax years falling before the date of enactment of the Tax Act or audits by the U.S. or foreign taxing authorities, which change the amount of our total income allocable to and taxed in the United States or a foreign country.
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
 December 31,
 2017 2016
 (in millions)
Unrecognized tax benefits: 
  
Beginning balance$134
 $155
Additions for tax positions taken during the current year
 
Additions for tax positions taken during prior years
 2
Reductions related to lapsed statutes of limitations(11) (7)
Reductions related to settlements with tax jurisdictions(1) (16)
Ending balance$122
 $134
Unrecognized tax benefits decreased by $12 million in 2017 and $21 million in 2016. Our effective tax rate would be affected by $91 million if these unrecognized tax benefits were to be recognized in the future.
Interest expense and penalties of $2$(29) million, $4 million, and $4$1 million were recorded for the years ended December 31, 2017, 20162020, 2019 and 2015,2018, respectively. Amounts recognized in our consolidated balance sheets for accrued interest and penalties related to income taxes of $29$4 million and $28$33 million as of December 31, 2020 and 2019, respectively, are included in other liabilities as of December 31, 2017 and 2016, respectively.
On December 18, 2015, the Protecting Americans from Tax Hikes Act of 2015 (PATH Act) was signed into law and was applicable to tax years 2015 through 2019. One of the provisions of the PATH Act permitted companies to deduct 50% of their capital expenditures for federal income tax purposes in the year qualifying assets were placed into service. We recorded a federal tax receivable of approximately $816 million for the year ended December 31, 2016 as a result of our intention at that time to carryback the tax net operating loss that was principally the result of this tax law change. The tax receivable was primarily associated with completion of the new capacity expansion projects that were placed into service at our Donaldsonville, Louisiana and Port Neal, Iowa complexes during November and December of 2016. The tax receivable is included in prepaid income taxes on our consolidated balance sheet as of December 31, 2016 and was received in the second quarter of 2017.

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During the third quarter of 2015, we acquired the remaining 50% equity interest in CF Fertilisers UK not previously owned by us and recognized a $94 million gain on the remeasurement to fair value of our initial 50% equity interest in CF Fertilisers UK. The earnings in CF Fertilisers UK have been permanently reinvested. Therefore, the recognition of the $94 million gain on the remeasurement of the historical equity investment does not include the recognition of tax expense on the gain. See Note 7—Equity Method Investments for additional information.
We recorded an income tax benefit of $12 million during the second quarter of 2015 for the pre-tax losses on the sale of equity method investments. The tax benefit related to the loss on the sale of our interests in Keytrade is included in equity in earnings of non-operating affiliatesnet of taxes in our consolidated statements of operations. See Note 7—Equity Method Investments for additional information.

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10.11.   Pension and Other Postretirement Benefits
We maintain five5 funded pension plans,three consisting of3 in North America (one(1 U.S. plan and two2 Canadian plans) and two2 in the United Kingdom. OneNaN of our Canadian plans is closed to new employees and the two2 United Kingdom plans are closed to new employees and future accruals. The portion of the U.S. plan that is open to new employees is a cash balance plan, which provides benefits based on years of service and interest credits. We also provide group medical insurance benefits to certain retirees in North America. The specific medical benefits provided to retirees vary by group and location.
Our plan assets, benefit obligations, funded status and amounts recognized on theour consolidated balance sheets for our North America and United Kingdom plans as of the December 31 measurement date are as follows:
Pension Plans Retiree Medical PlansPension PlansRetiree Medical Plans
North America United Kingdom North America North AmericaUnited KingdomNorth America
December 31, December 31, December 31,December 31,December 31,December 31,
2017 2016 2017 2016 2017 2016 202020192020201920202019
(in millions) (in millions)
Change in plan assets 
  
      
  
Change in plan assets
Fair value of plan assets as of January 1$636
 $627
 $366
 $414
 $
 $
Fair value of plan assets as of January 1$790 $673 $418 $383 $$
Return on plan assets70
 39
 16
 21
 
 
Return on plan assets96 115 58 19 
Employer contributions63
 4
 19
 19
 5
 4
Employer contributions22 38 23 23 
Plan participant contributions
 
 
 
 1
 1
Plan participant contributions
Benefit payments(40) (38) (22) (19) (6) (5)Benefit payments(66)(43)(25)(23)(5)(4)
Foreign currency translation9
 4
 35
 (69) 
 
Foreign currency translation17 16 
Fair value of plan assets as of December 31738
 636
 414
 366
 
 
Fair value of plan assets as of December 31846 790 491 418 
Change in benefit obligation 
  
  
  
  
  
Change in benefit obligation
Benefit obligation as of January 1(759) (736) (559) (563) (52) (56)Benefit obligation as of January 1(839)(742)(597)(524)(37)(43)
Service cost(14) (14) 
 
 
 
Service cost(17)(14)
Interest cost(30) (31) (16) (19) (2) (2)Interest cost(25)(30)(11)(15)(1)(1)
Benefit payments40
 38
 22
 19
 6
 5
Benefit payments66 43 25 23 
Foreign currency translation(9) (3) (52) 99
 
 
Foreign currency translation(4)(7)(20)(22)
Plan amendmentsPlan amendments(4)
Plan participant contributions
 
 
 
 (1) (1)Plan participant contributions(1)(1)
Change in assumptions and other(33) (13) 15
 (95) (4) 2
Change in assumptions and other(65)(85)(40)(62)(1)
Benefit obligation as of December 31(805) (759) (590) (559) (53) (52)Benefit obligation as of December 31(884)(839)(643)(597)(35)(37)
Funded status as of year end$(67) $(123) $(176) $(193) $(53) $(52)
Funded status as of December 31Funded status as of December 31$(38)$(49)$(152)$(179)$(35)$(37)
In the table above, the line titled "change“Plan amendments” for 2019 relates to the impact of updates to certain mortality tables for the U.S. plan and a conversion option for pensions in payment for the U.K. plans.
The line titled “Change in assumptions and other"other” for our North America pension plans primarily reflects the impact of changeslosses due to the decrease in discount rates the adoption of new mortalityfor 2020 and 2019. 
The line titled “Change in assumptions and updated census dataother” for our U.K. pension plans primarily reflects losses due to the decrease in discount rates for 2020 and 2019. For 2019, the United Kingdom.losses from the decrease in discount rates was partially offset by gains due to the decrease in inflation rate assumptions.
The line titled “Benefit payments” includes $22 million of lump sum payments for our U.S. pension plan in December 2020.

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Amounts recognized on the consolidated balance sheets consist of the following:
Pension PlansRetiree Medical Plans
 North AmericaUnited KingdomNorth America
 December 31,December 31,December 31,
 202020192020201920202019
 (in millions)
Other assets$10 $10 $$$$
Accrued expenses(3)(3)
Other liabilities(48)(59)(152)(179)(32)(34)
$(38)$(49)$(152)$(179)$(35)$(37)
 Pension Plans Retiree Medical Plans
 North America United Kingdom North America
 December 31, December 31, December 31,
 2017 2016 2017 2016 2017 2016
 (in millions)
Other assets$10
 $7
 $
 $
 $
 $
Accrued expenses
 
 
 
 (4) (5)
Other liabilities(77) (130) (176) (193) (49) (47)
 $(67) $(123) $(176) $(193) $(53) $(52)

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Pre-tax amounts recognized in accumulated other comprehensive loss consist of the following:
Pension PlansRetiree Medical Plans
 North AmericaUnited KingdomNorth America
 December 31,December 31,December 31,
 202020192020201920202019
 (in millions)
Prior service cost$$$$$$
Net actuarial loss79 82 129 132 
$83 $87 $130 $133 $$
 Pension Plans Retiree Medical Plans
 North America United Kingdom North America
 December 31, December 31, December 31,
 2017 2016 2017 2016 2017 2016
 (in millions)
Prior service cost (benefit)$1
 $1
 $
 $
 $(2) $(4)
Net actuarial loss80
 91
 73
 80
 12
 7
 $81
 $92
 $73
 $80
 $10
 $3

Net periodic benefit cost (income) and other amounts recognized in accumulated other comprehensive loss for the years ended December 31 included the following:
 Pension PlansRetiree Medical Plans
North AmericaUnited KingdomNorth America
 202020192018202020192018202020192018
 (in millions)
Service cost$17 $14 $15 $$$$$$
Interest cost25 30 28 11 15 14 
Expected return on plan assets(30)(32)(31)(14)(18)(17)
Amortization of prior service cost (benefit)(1)(1)
Amortization of actuarial loss (gain)(1)(1)(1)
Net periodic benefit cost (income)16 12 15 (3)(3)(1)
Net actuarial (gain) loss(1)(4)60 (3)(4)(8)
Prior service cost (credit)(3)
Amortization of prior service (cost) benefit(1)
Amortization of actuarial (loss) gain(3)(3)(3)
Total recognized in accumulated other comprehensive loss(5)(7)57 (2)(6)
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss$11 $19 $15 $(7)$54 $(1)$$(3)$(6)
In the table above, the line titled “Prior service cost (credit)” in 2019 relates to plan amendments for updates to certain mortality tables for the U.S. plan and a conversion option for pensions in payment for the U.K. plans.
Service costs are recognized in cost of sales and selling, general and administrative expenses, and other costs are recognized in other non-operating—net on our consolidated statements of operations.    
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 Pension Plans Retiree Medical Plans
 North America United Kingdom North America
 2017 2016 2015 2017 2016 2015 2017 2016 2015
 (in millions)
Service cost$14
 $14
 $14
 $
 $
 $
 $
 $
 $
Interest cost30
 31
 30
 16
 19
 9
 2
 2
 2
Expected return on plan assets(26) (30) (28) (18) (20) (9) 
 
 
Amortization of prior service cost (benefit)
 
 
 
 
 
 (1) (1) (1)
Amortization of actuarial loss (gain)1
 1
 6
 1
 
 
 (1) (1) 1
Net periodic benefit cost (income)19
 16
 22
 (1) (1) 
 
 
 2
Net actuarial (gain) loss(11) 4
 (11) (13) 94
 (8) 5
 (2) (4)
Amortization of prior service benefit
 
 
 
 
 
 1
 1
 1
Amortization of actuarial (loss) gain(1) (1) (6) (1) 
 
 1
 
 (1)
Total recognized in accumulated other comprehensive loss(12) 3
 (17) (14) 94
 (8) 7
 (1) (4)
Total recognized in net periodic benefit cost (income) and accumulated other comprehensive loss$7
 $19
 $5
 $(15) $93
 $(8) $7
 $(1) $(2)
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Amounts that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2018 are as follows:
CF INDUSTRIES HOLDINGS, INC.
 Pension Plans Retiree Medical Plans
 North America United Kingdom North America
 (in millions)
Prior service cost (benefit)$
 $
 $(1)
Net actuarial loss (gain)3
 
 


The accumulated benefit obligation (ABO) in aggregate for the defined benefit pension plans in North America was approximately $759$834 million and $712$793 million as of December 31, 20172020 and December 31, 2016,2019, respectively. The ABO in aggregate for the defined benefit pension plans in the United Kingdom was approximately $590$643 million and $559$597 million as of December 31, 20172020 and December 31, 2016,2019, respectively.


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The following table presents aggregated information for those individual defined benefit pension plans that have an ABO in excess of plan assets as of December 31, which excludes onetwo North American defined benefit pension planplans that hashave plan assets in excess of its ABO:
North America United KingdomNorth AmericaUnited Kingdom
2017 2016 2017 20162020201920202019
(in millions) (in millions)
Accumulated benefit obligation$(629) $(599) $(590) $(559)Accumulated benefit obligation$(678)$(654)$(643)$(597)
Fair value of plan assets590
 508
 414
 366
Fair value of plan assets667 630 491 418 
The following table presents aggregated information for those individual defined benefit pension plans that have a PBOprojected benefit obligation (PBO) in excess of plan assets as of December 31, which excludes onetwo North American defined benefit pension planplans that hashave plan assets in excess of its PBO:
 North America United Kingdom
 2017 2016 2017 2016
 (in millions)
Projected benefit obligation$(739) $(699) $(590) $(559)
Fair value of plan assets663
 568
 414
 366
North AmericaUnited Kingdom
2020201920202019
 (in millions)
Projected benefit obligation$(715)$(689)$(643)$(597)
Fair value of plan assets667 630 491 418 
Our pension funding policy in North America is to contribute amounts sufficient to meet minimum legal funding requirements plus discretionary amounts that we may deem to be appropriate. Actual contributions may vary from estimated amounts depending on changes in assumptions, actual returns on plan assets, changes in regulatory requirements and funding decisions.
In accordance with United Kingdom pension legislation, our United Kingdom pension funding policy is to contribute amounts sufficient to meet the funding level target agreed between the employer and the trustees of the United Kingdom plans.  Actual contributions are usually agreed with the plan trustees in connection with each triennial valuation and may vary following each such review depending on changes in assumptions, actual returns on plan assets, changes in regulatory requirements and funding decisions.
OurWe currently estimate that our consolidated pension funding contributions for 2018 are estimated to2021 will be approximately $15$6 million for the North America plans and $26$27 million for the United Kingdom plans.
The expected future benefit payments for our pension and retiree medical plans are as follows:
 Pension Plans Retiree Medical Plans
 North America United Kingdom North America
 (in millions)
2018$43
 $24
 $4
201945
 25
 4
202046
 25
 4
202147
 26
 4
202248
 27
 4
2023-2027251
 145
 15

Pension PlansRetiree Medical Plans
North AmericaUnited KingdomNorth America
 (in millions)
2021$47 $27 $
202247 28 
202348 29 
202448 30 
202549 30 
2026-2030251 163 
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The following assumptions were used in determining the benefit obligations and expense:
Pension Plans Retiree Medical PlansPension PlansRetiree Medical Plans
North America United KingdomNorth America North AmericaUnited KingdomNorth America
2017 2016 2015 2017 2016 2015 2017 2016 2015 202020192018202020192018202020192018
Weighted-average discount rate—obligation3.6% 4.0% 4.3% 2.5% 2.8% 3.8% 3.4% 3.8% 3.9%Weighted-average discount rate—obligation2.4 %3.1 %4.1 %1.5 %2.0 %2.9 %2.2 %3.0 %4.1 %
Weighted-average discount rate—expense4.0% 4.3% 4.0% 2.8% 3.8% 3.7% 3.8% 3.9% 3.6%Weighted-average discount rate—expense3.1 %4.1 %3.6 %2.0 %2.9 %2.5 %3.0 %4.1 %3.4 %
Weighted-average cash balance interest crediting rate—obligationWeighted-average cash balance interest crediting rate—obligation3.0 %3.0 %3.0 %n/an/an/an/an/an/a
Weighted-average cash balance interest crediting rate—expenseWeighted-average cash balance interest crediting rate—expense3.0 %3.0 %3.0 %n/an/an/an/an/an/a
Weighted-average rate of increase in future compensation4.3% 4.3% 4.3% n/a
 n/a
 n/a
 n/a
 n/a
 n/a
Weighted-average rate of increase in future compensation4.2 %4.2 %4.3 %n/an/an/an/an/an/a
Weighted-average expected long-term rate of return on assets—expense4.2% 4.9% 4.8% 4.6% 5.2% 5.4% n/a
 n/a
 n/a
Weighted-average expected long-term rate of return on assets—expense4.1 %4.6 %4.5 %3.4 %4.4 %4.2 %n/an/an/a
Weighted-average retail price index—obligationn/a
 n/a
 n/a
 3.2% 3.3% 3.1% n/a
 n/a
 n/a
Weighted-average retail price index—obligationn/an/an/a3.0 %3.0 %3.3 %n/an/an/a
Weighted-average retail price index—expensen/a
 n/a
 n/a
 3.3% 3.1% 3.1% n/a
 n/a
 n/a
Weighted-average retail price index—expensen/an/an/a3.0 %3.3 %3.2 %n/an/an/a

n/a—not applicable
The discount rates for all plans are developed by plan using spot rates derived from a hypothetical yield curve of high quality (AA rated or better) fixed income debt securities as of the year-end measurement date to calculate discounted cash flows (the projected benefit obligation) and solving for a single equivalent discount rate that produces the same projected benefit obligation. In determining our benefit obligation, we use the actuarial present value of the vested benefits to which each eligible employee is currently entitled, based on the employee’s expected date of separation or retirement.
The cash balance interest crediting rate for the U.S. plan is based on the greater of 10-year Treasuries or 3.0%.
For our North America plans, the expected long-term rate of return on assets is based on analysis of historical rates of return achieved by equity and non-equity investments and current market characteristics, adjusted for estimated plan expenses and weighted by target asset allocation percentages. As of January 1, 2018,2021, our weighted-average expected long-term rate of return on assets is 4.5%.3.2%, which will be used in determining expense for 2021.
For our United Kingdom plans, the expected long-term rate of return on assets is based on the expected long-term performance of the underlying investments, adjusted for investment managers' fees.managers’ fees and estimated plan expenses. As of January 1, 2018,2021, our weighted-average expected long-term rate of return on assets is 4.2%.3.3%, which will be used in determining expense for 2021.
The retail price index for the United Kingdom plans is developed using the Bank of England implied retail price inflation curve, which is based on the difference between yields on fixed interest government bonds and index-linked government bonds.
For the measurement of the benefit obligation at December 31, 20172020 for our primary (U.S.) retiree medical benefit plans, the assumed health care cost trend rates, for pre-65 retirees, start with a 8.0%6.3% increase in 2018,2021, followed by a gradual decline in increases to 4.5% for 2030 and thereafter. For post-65 retirees, the assumed health care cost trend rates start with a 7.0% increase in 2021, followed by a gradual decline in increases to 4.5% for 2030 and thereafter. For the measurement of the benefit obligation at December 31, 2019 for our primary (U.S.) retiree medical benefit plans, the assumed health care cost trend rates, for pre-65 retirees, started with a 7.0% increase in 2020, followed by a gradual decline in increases to 4.5% for 2026 and thereafter. For post-65 retirees, the assumed health care cost trend rates startstarted with a 9.5%an 8.3% increase in 2018,2020, followed by a gradual decline in increases to 4.5% for 2026 and thereafter. For the measurement of the benefit obligation at December 31, 2016 for our primary (U.S.) retiree medical benefit plans, the assumed health care cost trend rates, for pre-65 retirees, start with a 7.0% increase in 2017, followed by a gradual decline in increases to 4.5% for 2024 and thereafter. For post-65 retirees, the assumed health care cost trend rates start with a 8.5% increase in 2017, followed by a gradual decline in increases to 4.5% for 2024 and thereafter.
A one-percentage point change in the assumed health care cost trend rate of our primary (U.S.) retiree medical benefit plans as of December 31, 2017 would have the following effects on our retiree medical benefit plans:
 One-Percentage-Point
 Increase Decrease
 (in millions)
Effect on total service and interest cost for 2017$
 $
Effect on benefit obligation as of December 31, 20176
 (5)


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The objectives of the investment policies governing the pension plans are to administer the assets of the plans for the benefit of the participants in compliance with all laws and regulations, and to establish an asset mix that provides for diversification and considers the risk of various different asset classes with the purpose of generating favorable investment returns. The investment policies consider circumstances such as participant demographics, time horizon to retirement and liquidity needs, and provide guidelines for asset allocation, planning horizon, general portfolio issues and investment manager evaluation criteria. The investment strategies for the plans, including target asset allocations and investment vehicles, are subject to change within the guidelines of the policies.
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The target asset allocation for our U.S. pension plan is 80% non-equity and 20% equity, which has been determined based on analysis of actual historical rates of return and plan needs and circumstances. The equity investments are tailored to exceed the growth of the benefit obligation and are a combination of U.S. and non-U.S. total stock market index mutual funds. The non-equity investments consist primarily of investments in debt securities and money market instruments that are selected based on investment quality and duration to mitigate volatility of the funded status and annual required contributions. The non-equity investments have a duration profile that is similar to the benefit obligation in order to mitigate the impact of interest rate changes on the funded status. This investment strategy is achieved through the use of mutual funds and individual securities.
The target asset allocation for one of the CF Canadian planplans is 60%70% non-equity and 40%30% equity, and 100% non-equity for the Terraother Canadian planplan. This investment strategy is 85%achieved through the use of a mutual fund for equity investments and individual securities for non-equity and 15% equity.investments. The equity investments areinvestment is a passively managed portfoliosportfolio that diversifydiversifies assets across multiple securities, economic sectors and countries. The non-equity investments consist primarily of investments in debt securities that are highselected based on investment quality passively managed portfoliosand duration to mitigate volatility of the funded status and annual required contributions. The non-equity investments have a duration profile that diversify assets across economic sectors, countries and maturity spectrums. This investment strategy is achieved throughsimilar to the usebenefit obligation in order to mitigate the impact of mutual funds.interest rate changes on the funded status.
The pension assets in the United Kingdom plans are each administered by a Board of Trustees consisting of employer nominated trustees, member nominated trustees and an independent trustee. Trustees may be appointed or removed by CF Fertilisers UK, provided CF Fertilisers UK fulfills its obligation to havetrustee, with a requirement that member nominated trustees represent at least one thirdone-third of theeach Board of Trustees as member nominated.Trustees. It is the responsibility of the trustees to ensure prudent management and investment of the assets in the plans. The trustees meet on a quarterly basis to review and discuss fund performance and other administrative matters.
The trustees’ investment objectives are to hold assets that generate returns sufficient to cover prudently each plan'splan’s liability without exposing the plans to unacceptable risk. This is accomplished through the asset allocation strategy of each plan. For both plans, if the asset allocation moves more than plus or minus 5% from the benchmark allocation, the trustees may decide to amend the asset allocation. At a minimum, the trustees review the investment strategy at every triennial actuarial valuation to ensure that the strategy remains consistent with its funding principles. The trustees may review the strategy more frequently if opportunities arise to reduce risk within the investments without jeopardizing the funding position.
Assets of the United Kingdom plans are invested in externally managed pooled funds. The target asset allocation for the United Kingdom Terra plan is 55% actively managed targetassets are allocated between a growth portfolio and a matching portfolio. The growth portfolio seeks a return funds, 30% actively and passively managed bond and gilt funds and 15% actively managed property funds. The target asset allocation for the United Kingdom Kemira plan is 50% actively managed target return funds, 45% actively and passively managed bond and gilt funds and 5% in an actively managed property fund. The target return funds diversify assetspremium on investments across multiple asset classes (whichclasses. Growth portfolio funds may include, among others, traditional equities and bonds)bonds, growth fixed income, hedged funds, and may use derivatives. The bondmatching portfolio seeks to align asset changes with changes in liability due to interest and giltdiscount rate. Matching portfolio funds are composed of corporate bonds, U.K. gilts and liability-driven investment funds and generally invest in fixed income debt securities including government bonds, gilts, high yield and emerging market bonds,gilt repurchase agreements, swaps and investment grade corporate bonds and may use derivatives. The target asset allocation for one of the United Kingdom plans is 55% in the growth portfolio and 45% in the matching portfolio and the other United Kingdom plan is 60% in the growth portfolio (including a legacy holding in an actively managed property funds are invested predominatelyfund) and 40% in freehold and leasehold property.the matching portfolio.





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The fair values of our pension plan assets as of December 31, 20172020 and 2016,2019, by major asset class, are as follows:
 North America
December 31, 2020
 Total Fair
Value
Quoted
Prices in
Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash and cash equivalents(1)
$30 $$23 $
Equity mutual funds
Index equity(2)
134 134 
Pooled equity(3)
30 30 
Fixed income    
U.S. Treasury bonds and notes(4)
37 37 
Corporate bonds and notes(5)
499 499 
Government and agency securities(6)
110 110 
Other(7)
Total assets at fair value by fair value levels$847 $178 $669 $
Accruals and payables—net(1)
Total assets$846    
 North America
 December 31, 2017
 
Total Fair
Value
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash and cash equivalents(1)
$26
 $
 $26
 $
Equity mutual funds 
  
  
  
Index equity(2)
136
 136
 
 
Pooled equity(3)
42
 
 42
 
Fixed income 
  
  
  
U.S. Treasury bonds and notes(4)
15
 15
 
 
Pooled mutual funds(5)
106
 
 106
 
Corporate bonds and notes(6)
400
 
 400
 
Government and agency securities(7)
9
 
 9
 
Other(8)
3
 
 3
 
Total assets at fair value by fair value levels$737
 $151
 $586
 $
Receivables—net1
      
Total assets$738
  
  
  
 United Kingdom
December 31, 2020
 Total Fair
Value
Quoted
Prices in
Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash and cash funds(8)
$22 $$17 $
Pooled equity funds(9)
118 118 
Pooled diversified funds(10)
55 55 
Debt funds
Pooled U.K. government fixed and index-linked securities funds(11)
73 73 
Pooled global debt funds(12)
88 88 
Pooled liability-driven investment funds (13)
83 83 
Total assets at fair value by fair value levels$439 $$434 $
Funds measured at NAV as a practical expedient(14)
52 
Total assets$491 
91
 United Kingdom
 December 31, 2017
 
Total Fair
Value
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash$5
 $5
 $
 $
Pooled target return funds(9)
213
 
 213
 
Fixed income      
Pooled UK government index-linked securities(10)
31
 
 31
 
Pooled global fixed income funds(11)
122
 
 122
 
Total assets at fair value by fair value levels$371
 $5
 $366
 $
Assets measured at NAV as a practical expedient       
Pooled property funds(12)
43
      
Total assets measured at NAV as a practical expedient43
      
Total assets at fair value414
      
Accruals and payables—net
      
Total assets$414
      

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 North America
December 31, 2019
 Total Fair
Value
Quoted
Prices in
Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash and cash equivalents(1)
$21 $$20 $
Equity mutual funds
Index equity(2)
137 137 
Pooled equity(3)
35 35 
Fixed income
U.S. Treasury bonds and notes(4)
25 25 
Corporate bonds and notes(5)
472 472 
Government and agency securities(6)
93 93 
Other(7)
Total assets at fair value by fair value levels$791 $163 $628 $
Accruals and payables—net(1)   
Total assets$790    
 United Kingdom
December 31, 2019
 Total Fair
Value
Quoted
Prices in
Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash$$$$
Pooled target return funds(15)
220 220 
Fixed income
Pooled U.K. government index-linked securities funds(16)
32 32 
Pooled global fixed income funds(17)
33 33 
Pooled liability-driven investment funds (13)
84 84 
Total assets at fair value by fair value levels$373 $$369 $
Pooled property funds measured at NAV as a practical expedient(14)
45 
Total assets$418 

(1)Cash and cash equivalents are primarily repurchase agreements and short-term money market funds.
(2)The index equity funds are mutual funds that utilize a passively managed investment approach designed to track specific equity indices. They are valued at quoted market prices in an active market, which represent the net asset values of the shares held by the plan.
(3)The equity pooled mutual funds consist of pooled funds that invest in common stock and other equity securities that are traded on U.S., Canadian, and foreign markets.
(4)U.S. Treasury bonds and notes are valued based on quoted market prices in an active market.
(5)Corporate bonds and notes, including private placement securities, are valued by institutional bond pricing services, which gather information from market sources and integrate credit information, observed market movements and sector news into their pricing applications and models.
(6)Government and agency securities consist of U.S. municipal bonds and Canadian provincial bonds that are valued by institutional bond pricing services, which gather information on current trading activity, market movements, trends, and specific data on specialty issues.
92
 North America
 December 31, 2016
 
Total Fair
Value
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash and cash equivalents(1)
$39
 $6
 $33
 $
Equity mutual funds 
  
  
  
Index equity(2)
112
 112
 
 
Pooled equity(3)
41
 
 41
 
Fixed income 
  
  
  
U.S. Treasury bonds and notes(4)
14
 14
 
 
Pooled mutual funds(5)
86
 
 86
 
Corporate bonds and notes(6)
329
 
 329
 
Government and agency securities(7)
15
 
 15
 
    Other(8)
1
 
 1
 
Total assets at fair value by fair value levels$637
 $132
 $505
 $
Accruals and payables—net(1)  
  
  
Total assets$636
  
  
  

 United Kingdom
 December 31, 2016
 Total Fair
Value
 Quoted
Prices in
Active
Markets
(Level 1)
 Significant
Other
Observable
Inputs
(Level 2)
 Significant
Unobservable
Inputs
(Level 3)
 (in millions)
Cash$3
 $3
 $
 $
Pooled target return funds(9)
185
 
 185
 
Fixed income 
  
  
  
Pooled UK government index-linked securities(10)
28
 
 28
 
Pooled global fixed income funds(11)
114
 
 114
 
Total assets at fair value by fair value levels$330
 $3
 $327
 $
Assets measured at NAV as a practical expedient       
Pooled property funds(12)
36
      
Total assets measured at NAV as a practical expedient36
      
Total assets at fair value366
      
Accruals and payables—net
      
Total assets$366
      

(1)
Cash and cash equivalents are primarily repurchase agreements and short-term money market funds.
(2)
The index equity funds are mutual funds that utilize a passively managed investment approach designed to track specific equity indices. They are valued at quoted market prices in an active market, which represent the net asset values of the shares held by the plan.
(3)
The equity pooled mutual funds consist of pooled funds that invest in common stock and other equity securities that are traded on U.S., Canadian, and foreign markets.
(4)
U.S. Treasury bonds and notes are valued based on quoted market prices in an active market.

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(7)Other includes primarily mortgage-backed and asset-backed securities, which are valued by institutional pricing services, which gather information from market sources and integrate credit information, observed market movements and sector news into their pricing applications and models.
(5)
(8)Cash and cash funds include a cash fund that holds primarily short-dated term money market securities.
(9)Pooled equity funds invest in a broad array of global equity, equity-related securities, a range of diversifiers and may use derivatives for efficient portfolio management. The funds are valued at net asset value (NAV) as determined by the fund managers based on the value of the underlying net assets of the fund.
(10)Pooled diversified funds invest in broad array of asset classes and a range of diversifiers including the use of derivatives. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(11)Pooled U.K. government fixed and index-linked securities funds invest primarily in Sterling denominated fixed income and inflation-linked fixed income securities issued or guaranteed by the U.K. government and may use derivatives for efficient portfolio management. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(12)Pooled global debt funds invest in a broad array of debt securities from corporate and government bonds to emerging markets and high-yield fixed and floating rate securities of varying maturities. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(13)Pooled liability-driven investment funds invest primarily in gilt repurchase agreements, physical United Kingdom government gilts, and derivatives to provide exposure to interest rates, thus hedging this element of risk associated with pension liabilities. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(14)Funds measured at NAV as a practical expedient in 2020 include two funds of funds with return strategies with exposure to varying asset classes and credit strategies, as well as alternative investment strategies not precluding multi-asset credit strategies, global macro strategies, commodities, fixed income, equities and currency, and in 2020 and 2019, pooled property funds that invest primarily in freehold and leasehold property in the United Kingdom. The funds are valued using NAV as determined by the fund managers based on the value of the underlying assets of the fund.
(15)Pooled target return funds invest in a broad array of asset classes and a range of diversifiers including the use of derivatives. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(16)Pooled U.K. government index-linked securities funds invest primarily in United Kingdom government index-linked gilt securities. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(17)Pooled global fixed income funds invest primarily in government bonds, investment grade corporate bonds, high yield and emerging market bonds and can make use of derivatives. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.

The fixed income pooled mutual funds invest in investment-grade corporate debt, various governmental debt obligations, and mortgage-backed securities with varying maturities.
(6)
Corporate bonds and notes, including private placement securities, are valued by institutional bond pricing services, which gather information from market sources and integrate credit information, observed market movements and sector news into their pricing applications and models.
(7)
Government and agency securities consist of municipal bonds that are valued by institutional bond pricing services, which gather information on current trading activity, market movements, trends, and specific data on specialty issues.
(8)
Other includes primarily mortgage-backed and asset-backed securities, which are valued by institutional pricing services, which gather information from market sources and integrate credit information, observed market movements and sector news into their pricing applications and models.
(9)
Pooled target return funds invest in a broad array of asset classes and a range of diversifiers including the use of derivatives. The funds are valued at net asset value (NAV) as determined by the fund managers based on the value of the underlying net assets of the fund.
(10)
Pooled United Kingdom government index-linked funds invest primarily in United Kingdom government index-linked gilt securities. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(11)
Pooled global fixed income funds invest primarily in government bonds, investment grade corporate bonds, high yield and emerging market bonds and can make use of derivatives. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund.
(12)
Pooled property funds invest primarily in freehold and leasehold property in the United Kingdom. The funds are valued using NAV as a practical expedient. NAV is determined by the fund managers based on the value of the underlying net assets of the fund.
We have defined contribution plans covering substantially all employees in North America and the United Kingdom. In North America, dependingDepending on the specific provisions of each plan, qualified employees receive company contributions based on a percentage of base salary, matching of employee contributions up to specified limits, or a combination of both. Qualified employees in the United Kingdom receive company contributions based on a percentage of base salary that are greater than employee contributions up to specified limits. In 2017, 2016,2020, 2019, and 2015,2018, we recognized expense related to companyour contributions to the defined contribution plans of $18$22 million, $16$20 million, and $14$18 million, respectively.
In addition to our qualified defined benefit pension plans, we also maintain certain nonqualified supplemental pension plans for highly compensated employees as defined under federal law. The amounts recognized in accrued expenses and other liabilities in our consolidated balance sheets for these plans were $4 million and $16 million, respectively, as of December 31, 2020, and $2 million and $16 million, respectively, as of December 31, 2017 and $3 million and $17 million as of December 31, 2016, respectively.2019. We recognized expense for these plans of $2 million, $3$1 million, and $2 million in 2017, 2016, and 2015, respectively. The expense recognized in 2017 and 2016 includes a settlement charge of $1 million in each year,2020, 2019, and 2018, respectively.

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11.12.   Financing Agreements
Revolving Credit Agreement
We haveOn December 5, 2019, CF Holdings and CF Industries entered into a senior secured revolving credit agreement (as amended, including by an amendment effective July 29, 2016 (the July 2016Fourth Amended and Restated Credit Agreement Amendment)(the Revolving Credit Agreement), which amended and an amendment entered into on October 31, 2016restated our Third Amended and effective November 21, 2016 (the November 2016Restated Revolving Credit Agreement, Amendment)as previously amended (referred to herein, as in effect from time to time, as the Prior Credit Agreement), thethat was scheduled to mature September 18, 2020. The Revolving Credit Agreement) providingAgreement provides for a revolving credit facility of up to $750 million (reflecting a reduction from $1.5 billion as effected by the November 2016 Credit Agreement Amendment) with a maturity of September 18, 2020.December 5, 2024. The Revolving Credit Agreement includes a letter of credit sub-limit of $125 million. Borrowings under the Revolving Credit Agreement may be used for working capital, capital expenditures, acquisitions, share repurchases and other general corporate purposes. CF Industries may designate as borrowers one or more wholly owned subsidiaries that are organized in the United States or any state thereof or the District of Columbia.
Borrowings under the Revolving Credit Agreement may be denominated in U.S. dollars, Canadian dollars, euros and British pounds, and bear interest at a per annum rate equal to, at our option, an applicable eurocurrency rate or base rate plus, in either case, a specified margin, and the borrowersmargin. We are required to pay an undrawn commitment fee on the undrawn portion of the commitments under the Revolving Credit Agreement and customary letter of credit fees. The specified margin and the amount of the commitment fee depend on CF Holdings’ credit rating at the time.
The guarantors under the Revolving Credit Agreement are currently comprised of CF Holdings and CF Holdings’ wholly owned subsidiaries CF Industries Enterprises, LLC (CFE), CF Industries Sales, LLC (CFS), CF USA Holdings, LLC (CF USA) and CF Industries Distribution Facilities, LLC (CFIDF).
As of December 31, 2017,2020, we had excessunused borrowing capacity under the Revolving Credit Agreement of $695$750 million (net ofand 0 outstanding letters of credit of $55 million).credit. There were no0 borrowings outstanding under the Revolving Credit Agreement as of December 31, 20172020 or December 31, 2016,2019, and there were 0 borrowings outstanding under the Prior Credit Agreement or the Revolving Credit Agreement during 2017.2019. In March 2020, we borrowed $500 million under the Revolving Credit Agreement to ensure we maintained ample financial flexibility in light of the uncertainty in the global markets caused by the COVID-19 pandemic, which we repaid in April 2020. Maximum borrowings outstanding under the Revolving Credit Agreement during the year ended December 31, 20162020 were $150 million with a$500 million. The weighted-average annual interest rate of 1.85%borrowings under the Revolving Credit Agreement during the year ended December 31, 2020 was 2.05%.
The Revolving Credit Agreement contains representations and warranties and affirmative and negative covenants, including financial covenants. As of December 31, 2017,2020, we were in compliance with all covenants under the Revolving Credit Agreement.
Letters of Credit
In addition to the letters of credit outstandingthat may be issued under the Revolving Credit Agreement, as described above, we have also entered into a bilateral agreement with capacity to issue letters of credit up to $75 million.$250 million (reflecting an increase of $105 million in December 2020). As of December 31, 2017,2020, approximately $72$125 million of letters of credit were outstanding under this agreement.











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Senior Notes
Long-term debt presented on our consolidated balance sheets as of December 31, 20172020 and December 31, 20162019 consisted of the following Public Senior Notes (unsecured) and Senior Secured Notesdebt securities issued by CF Industries:
Effective Interest Rate December 31,
2017
 December 31,
2016
Effective Interest RateDecember 31, 2020December 31, 2019
 Principal 
Carrying Amount(1)
 Principal 
Carrying Amount(1)
Principal
Carrying Amount(1)
Principal
Carrying Amount(1)
 (in millions)(in millions)
Public Senior Notes:        Public Senior Notes:
6.875% due May 20187.344% $
 $
 $800
 $795
7.125% due May 20207.529% 500
 496
 800
 791
3.450% due June 20233.562% 750
 746
 750
 745
3.450% due June 20233.562%$750 $748 $750 $747 
5.150% due March 20345.279% 750
 739
 750
 739
5.150% due March 20345.279%750 741 750 740 
4.950% due June 20435.031% 750
 741
 750
 741
4.950% due June 20435.031%750 742 750 742 
5.375% due March 20445.465% 750
 741
 750
 741
5.375% due March 20445.465%750 741 750 741 
Senior Secured Notes:        Senior Secured Notes:
3.400% due December 20213.782% 500
 493
 500
 491
3.400% due December 20213.782%250 249 250 248 
4.500% due December 20264.759% 750
 736
 750
 735
4.500% due December 20264.759%750 740 750 739 
Total long-term debt $4,750
 $4,692
 $5,850
 $5,778
Total long-term debt$4,000 $3,961 $4,000 $3,957 
Less: Current maturities of long-term debtLess: Current maturities of long-term debt250 249 
Long-term debt, net of current maturitiesLong-term debt, net of current maturities$3,750 $3,712 $4,000 $3,957 

(1)
Carrying amount is net of unamortized debt discount and deferred debt issuance costs. Total unamortized debt discount was $12 million as of both December 31, 2017 and December 31, 2016, and total deferred debt issuance costs were $46 million and $60 million as of December 31, 2017 and December 31, 2016, respectively. 
Public Senior Notes(1)Carrying amount is net of unamortized debt discount and deferred debt issuance costs. Total unamortized debt discount was $9 million and $10 million as of December 31, 2020 and 2019, respectively, and total deferred debt issuance costs were $30 million and $33 million as of December 31, 2020 and 2019, respectively. 
Under the indentures (including the applicable supplemental indentures) governing the senior notes due 2018, 2020, 2023, 2034, 2043 and 2044 identified in the table above (the Public Senior Notes), each series of Public Senior Notes is guaranteed by CF Holdings. Interest on the Public Senior Notes is payable semiannually, and the Public Senior Notes are redeemable at our option, in whole at any time or in part from time to time, at specified make-whole redemption prices. The indentures governing the Public Senior Notes contain customary events of default (including cross-default triggered by acceleration of, or a principal payment default that is not cured within an applicable grace period under, other debt having a principal amount of $150 million or more) and covenants that limit, among other things, the ability of CF Holdings and its subsidiaries, including CF Industries, to incur liens on certain properties to secure debt.
If a Change of Control occurs together with a Ratings Downgrade (as both terms are defined under the indentures governing the Public Senior Notes), CF Industries would be required to offer to repurchase each series of Public Senior Notes at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest. In addition, in the event that a subsidiary of CF Holdings, other than CF Industries, becomes a borrower or a guarantor under the Revolving Credit Agreement (or any renewal, replacement or refinancing thereof), such subsidiary would be required to become a guarantor of the Public Senior Notes, provided that such requirement will no longer apply with respect to the Public Senior Notes due 2023, 2034, 2043 and 2044 following the repayment of the Public Senior Notes due 2018 and 2020 or the subsidiaries of ours, other than CF Industries, otherwise becoming no longer subject to such a requirement to guarantee the Public Senior Notes due 2018 and 2020.
On November 21, 2016, in connection with the effectiveness of the November 2016 Credit Agreement Amendment, CF Industries Enterprises, Inc. (CFE) and CF Industries Sales, LLC (CFS) became subsidiary guarantors of the Public Senior Notes.
On December 1, 2017, CF Industries completed the early redemption of all of the $800 million outstanding principal amount of the 6.875% senior notes due May 2018 (the 2018 Notes) in accordance with the optional redemption provisions provided in the indenture governing the 2018 Notes. The total aggregate redemption price was approximately $817 million. On December 26, 2017, CF Industries purchased approximately $300 million aggregate principal amount of the $800 million outstanding principal amount of the 7.125% senior notes due 2020 (the 2020 Notes) pursuant to a tender offer. The aggregate purchase price was approximately $331 million. As a result of the early redemption of the 2018 Notes and the purchase of the 2020 Notes, we recognized a loss on debt extinguishment of $53 million, primarily consisting of $48 million of premiums paid for the early retirement of debt for the 2018 Notes and 2020 Notes.

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Senior Secured Notes
On November 21, 2016, CF Industries issued $500 million aggregate principal amount of 3.400% senior secured notes due 2021 (the 2021 Notes) and $750 million aggregate principal amount of 4.500% senior secured notes due 2026 (the 2026 Notes, and together with the 2021 Notes, the Senior Secured Notes). The net proceeds, after deducting discounts and offering expenses, from the issuance and sale of the Senior Secured Notes were approximately $1.23 billion. CF Industries used approximately $1.18 billion of the net proceeds for the prepayment (including payment of a make-whole amount of approximately $170 million and accrued interest) in full of the outstanding $1.0 billion aggregate principal amount of the Private Senior Notes. See "—Private Senior Notes," below.
Interest on the Senior Secured Notes is payable semiannually on December 1 and June 1 beginning on June 1, 2017, and the Senior Secured Notes are redeemable at our option, in whole at any time or in part from time to time, at specified make-whole redemption prices.
Under the terms of the applicable indenture, the 3.400% senior secured notes due December 2021 (the 2021 Notes) and the 4.500% senior secured notes due December 2026 (the 2026 Notes) identified in the table above (together, the Senior Secured Notes of each seriesNotes) are fully and unconditionally guaranteed on a senior secured basis, jointly and severally, by CF Holdings and each current and future domestic subsidiary of CF Holdings (other than CF Industries) that from time to time is a borrower, or guarantees indebtedness, under the Revolving Credit Agreement. In accordance with the applicable indenture, CFE and CFS, in addition toThe requirement for any subsidiary of CF Holdings guaranteedto guarantee the Senior Secured Notes of eacha series uponwill apply only until, and the initial issuancesubsidiary guarantees of the Senior Secured Notes.Notes of a series will be automatically released upon, CF Holdings having an investment grade corporate rating, with a stable or better outlook, from two of three selected ratings agencies and there being no default or event of default under the applicable indenture. The subsidiary guarantors of the Senior Secured Notes currently consist of CFE, CFS, CF USA and CFIDF.
Subject to certain exceptions, the obligations under each series of Senior Secured Notes and each guarantor’s related guarantee are secured by a first priority security interest in substantially all of the assets of CF Industries, CF Holdings and the subsidiary guarantors, including a pledge by CFSCF USA of its equity interests in CFN and mortgages over certain material fee-owned domestic real properties (the Collateral). The obligations under the Revolving Credit Agreement, together with certain letter of credit, cash management, hedging and similar obligations and future pari passu secured indebtedness, will beare secured by the Collateral on a pari passu basis with the Senior Secured Notes. The liens on the Collateral securing the obligations under the Senior Secured Notes of a series and the related guarantees will be automatically released and the covenant under the applicable indenture limiting dispositions of Collateral will no longer apply if on any date after the initial issuance of the Senior Secured Notes CF Holdings has an investment grade corporate rating, with a stable or better outlook, from two of three selected ratings agencies and there is no default or event of default under the applicable indenture.
Under each of the indentures governing the Senior Secured Notes, specified changes of control involving CF Holdings or CF Industries, when accompanied by a ratings downgrade, as defined with respect to the applicable series of Senior Secured Notes, constitute change of control repurchase events. Upon the occurrence of a change of control repurchase event with respect to the 2021 Notes or the 2026 Notes, as applicable, unless CF Industries has exercised its option to redeem such Senior Secured Notes, CF Industries will be required to offer to repurchase them at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any, to, but not including, the date of repurchase.
The indentures governing the Senior Secured Notes contain covenants that limit, among other things, the ability of CF Holdings and its subsidiaries, including CF Industries, to incur liens on certain assets to secure debt, to engageOn November 13, 2019, we redeemed in sale and leaseback transactions, to sell or transfer Collateral, to merge or consolidate with other entities and to sell, lease or transfer all or substantiallyfull all of the assets of CF Holdings and its subsidiaries to another entity. Each of the indentures governing the Senior Secured Notes provides for customary events of default, which include (subject in certain cases to customary grace and cure periods), among others, nonpayment of principal or interest on the applicable Senior Secured Notes; failure to comply with other covenants or agreements under the indenture; certain defaults on other indebtedness; the failure of CF Holdings' or certain subsidiaries’ guarantees of the applicable Senior Secured Notes to be enforceable; lack of validity or perfection of any lien securing the obligations under the Senior Secured Notes and the guarantees with respect to Collateral having an aggregate fair market value equal to or greater than a specified amount; and specified events of bankruptcy or insolvency. Under each indenture governing the Senior Secured Notes, in the case of an event of default arising from one of the specified events of bankruptcy or insolvency, the applicable Senior Secured Notes would become due and payable immediately, and, in the case of any other event of default (other than an event of default related to CF Industries' and CF Holdings' reporting obligations), the trustee or the holders of at least 25% in aggregateremaining $500 million outstanding principal amount of the applicable Senior Secured Notes then outstanding may declare all of such Senior Secured Notes to be due and payable immediately.
Private Senior Notes
The7.125% senior notes due 2022, 2025 and 2027May 2020 (the Private Senior2020 Notes), issued by CF Industriesin accordance with the optional redemption provisions in the indenture governing the 2020 Notes. The total aggregate redemption price paid on September 24, 2015, were governed by the terms2020 Notes in connection with the redemption was approximately $512 million, excluding accrued interest. As a result, we recognized a loss on debt extinguishment of a note purchase agreement (as amended, including by an amendment effective September 7, 2016, the Note Purchase Agreement). The Private Senior Notes were guaranteed by CF Holdings. All obligations under the Note Purchase Agreement were unsecured.

$12 million, primarily consisting of premiums paid.
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On November 21, 2016,December 13, 2019, we prepaid in full the outstanding $1.0 billion aggregateredeemed $250 million principal amount, representing 50% of our Private Seniorthe $500 million principal amount outstanding immediately prior to such redemption, of the 2021 Notes in accordance with the optional redemption provisions in the indenture governing the 2021 Notes. The prepayment of $1.18 billion includedtotal aggregate redemption price paid in connection with the payment of a make-whole amount ofredemption was approximately $170$257 million, andexcluding accrued interest. LossAs a result, we recognized a loss on debt extinguishment of $167$9 million, on our consolidated statementsprimarily consisting of operations excludes $3premiums paid.
On February 17, 2021, we announced that CF Industries elected to redeem in full the entire outstanding $250 million principal amount of the make-whole payment, which was accounted2021 Notes on March 20, 2021, in accordance with the optional redemption provisions provided in the indenture governing the 2021 Notes. See Note 25—Subsequent Events for as a modificationadditional information.
Interest on the Public Senior Notes and recognized on our consolidated balance sheet as deferred financing fees, a reduction of long-term debt, and is being amortized using the effective interest rate method over the term of the Senior Secured Notes.Notes is payable semiannually, and the Public Senior Notes and Senior Secured Notes are redeemable at our option, in whole at any time or in part from time to time, at specified make-whole redemption prices.
Bridge Credit Agreement
On August 6, 2015, we entered into a definitive agreement (as amended, the Combination Agreement) to combine with the European, North American and global distribution businesses of OCI N.V. (OCI). On September 18, 2015, in connection with the proposed combination, CF Holdings and CF Industries entered into a senior unsecured 364-Day Bridge Credit Agreement (as amended, the Bridge Credit Agreement). Upon the termination of the Combination Agreement in the second quarter of 2016, the lenders’ commitments under the Bridge Credit Agreement terminated automatically. There were no borrowings under the Bridge Credit Agreement. See Note 12—Interest Expense for additional information.
12.13. Interest Expense
Details of interest expense are as follows:
Year ended December 31, Year ended December 31,
2017 2016 2015 202020192018
(in millions) (in millions)
Interest on borrowings(1)
$300
 $303
 $267
Interest on borrowings(1)
$185 $223 $228 
Fees on financing agreements(1)(2)(3)
16
 59
 17
Interest on tax liabilities1
 4
 3
Fees on financing agreements(1)
Fees on financing agreements(1)
13 13 
Interest on tax liabilities(2)
Interest on tax liabilities(2)
(14)
Interest capitalized(2) (166) (154)Interest capitalized(2)(1)
Interest expense$315
 $200
 $133
Interest expense$179 $237 $241 

(1)
See Note 11—Financing Agreements for additional information.
(2)
Fees on financing agreements for the year ended December 31, 2016 includes $28 million of fees related to the termination of the tranche B commitment under the bridge credit agreement as a result of the termination of the Combination Agreement. Fees on financing agreements for the year ended December 31, 2015 includes $6 million of accelerated amortization of deferred fees related to the termination in September 2015 of the tranche A commitment under the bridge credit agreement. See Note 11—Financing Agreements additional information.
(3)
Fees on financing agreements for the year ended December 31, 2016 includes $9 million of accelerated amortization of deferred fees related to the payment of the Private Senior Notes in November 2016, $2 million of accelerated amortization of deferred fees related to the July 2016 Credit Agreement Amendment, which reduced the Revolving Credit Facility to $1.5 billion from $2.0 billion, and $4 million of accelerated amortization of deferred fees related to the November 2016 Credit Agreement Amendment, which reduced the Revolving Credit Facility to $750 million from $1.5 billion. See Note 11—Financing Agreements for additional information.

(1)See Note 12—Financing Agreements for additional information.

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13.   Other Operating Expenses
Pursuant to the termination agreement entered into(2)Interest on May 22, 2016, under which CF Holdings, OCI and the other parties to the Combination Agreement agreed to terminate the Combination Agreement by mutual written consent, CF Holdings paid OCI a termination fee of $150 million, which is included in transaction costs in our consolidated statement of operationstax liabilities for the year ended December 31, 2016.2020 includes a reduction in interest accrued on the reserve for unrecognized tax benefits.
14.   Other Operating—Net
Details of other operating—net are as follows:
 Year ended December 31,
 202020192018
 (in millions)
Insurance proceeds(1)
$(37)$(37)$(10)
Loss (gain) on disposal of property, plant and equipment—net(2)
15 (40)
Loss (gain) on foreign currency transactions(3)
(1)(5)
Loss on embedded derivative(4)
Other(3)(19)
Other operating—net$(17)$(73)$(27)

(1)Insurance proceeds in 2020 and 2019 relate to property and business interruption insurance claims at one of our nitrogen complexes.
(2)Loss (gain) on disposal of property, plant and equipment—net in 2020 includes $9 million of engineering costs written off upon the cancellation of a project at one of our nitrogen complexes. In 2019, includes the gain on sale of our Pine Bend facility of $45 million. See Note 6—Property, Plant and Equipment—Net for additional information on the sale of our Pine Bend facility.
(3)Loss (gain) on foreign currency transactions consists of foreign currency exchange rate impacts on foreign currency denominated transactions, including the impact of changes in foreign currency exchange rates on intercompany loans that were not permanently invested.
(4)Loss on embedded derivative consists of unrealized and realized losses related to a provision of our strategic venture with CHS. See Note 9—Fair Value Measurements for additional information.
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 Year ended December 31,
 2017 2016 2015
 (in millions)
Loss on disposal of property, plant and equipment—net$3
 $10
 $21
Expansion project costs(1)

 73
 51
Loss on foreign currency derivatives(2)

 
 22
Loss (gain) on foreign currency transactions(3)
2
 93
 (8)
Loss on embedded derivative(4)
4
 23
 
Other9
 9
 6
Other operating—net$18
 $208
 $92
(1)
Expansion project costs that did not qualify for capitalization include amounts related to administrative and consulting services for our capacity expansion projects in Port Neal, Iowa and Donaldsonville, Louisiana. Our capacity expansion projects were completed as of December 31, 2016.
(2)
See Note 14—Derivative Financial Instruments for additional information.
(3)
Loss (gain) on foreign currency transactions primarily relates to the unrealized foreign currency exchange rate impact on intercompany debt that has not been permanently invested.
(4)
The loss on embedded derivative consists of unrealized and realized losses related to a provision of our strategic venture with CHS. See Note 8—Fair Value Measurements for additional information.


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14.

15.   Derivative Financial Instruments
We may use derivative financial instruments to reduce our exposure to changes in commodity prices and foreign currency exchange rates.
Commodity Price Risk Management
for natural gas that will be purchased in the future. Natural gas is the largest and most volatile component of theour manufacturing cost for nitrogen-based products. We manage the risk ofFrom time to time, we may also use derivative financial instruments to reduce our exposure to changes in natural gas prices primarily through the use of derivative financial instruments.foreign currency exchange rates. The derivatives that we may use to reduce our exposure to changes in prices for this purposenatural gas are primarily natural gas fixed price swaps, basis swaps and natural gas options traded in the OTC markets. These natural gas derivatives settle using primarily a NYMEX futures price index, which represents the basis for fair value at any given time. We enter into natural gas derivative contracts with respect to natural gas to be consumed by us in the future, and settlements of those derivative contracts are scheduled to coincide with our anticipated purchases of natural gas used to manufacture nitrogen products during those future periods. We use natural gas derivatives as an economic hedge of natural gas price risk, but without the application of hedge accounting. As a result, changes in fair value of these contracts are recognized in earnings. As of December 31, 2017,2020, we havehad natural gas derivative contractsfixed price swaps and basis swaps covering certain periods through the end of 2018.March 2022.
As of December 31, 20172020, our open natural gas derivative contracts consisted of natural gas fixed price swaps and 2016,basis swaps for 34.1 million MMBtus. As of December 31, 2019, we had open natural gas derivative contracts for 35.941.1 million MMBtus of natural gas fixed price swaps, basis swaps and 183.0 million MMBtus, respectively.options. For the year ended December 31, 2017,2020, we used derivatives to cover approximately 42%19% of our natural gas consumption.
Foreign Currency Exchange Rates
A portion of the costs for our completed capacity expansion projects at our Donaldsonville, Louisiana complex and Port Neal, Iowa complex were euro-denominated. In order to manage our exposure to changes in the euro to U.S. dollar currency exchange rates, we hedged our projected euro-denominated payments through the end of 2016 using foreign currency forward contracts.

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As of December 31, 2017 and December 31, 2016, accumulated other comprehensive loss (AOCL) includes $6 million and $7 million, respectively, of pre-tax gains related to the foreign currency derivatives that were originally designated as cash flow hedges. The balance in AOCL is being reclassified into income over the depreciable lives of the property, plant and equipment associated with the capacity expansion projects, of which $1 million was reclassifed into income in 2017.
The effect of derivatives in our consolidated statements of operations is shown in the table below:below.
 Gain (loss) in income
   Year ended December 31,
 Location 2017 2016 2015
   (in millions)
Natural gas derivativesCost of sales $(61) $260
 $(176)
Foreign exchange contractsOther operating—net 
 
 22
Unrealized (losses) gains recognized in income  (61) 260
 (154)
Realized losses  (26) (133) (114)
Net derivative (losses) gains  $(87) $127
 $(268)

 Gain (loss) recognized in income
  Year ended December 31,
Location202020192018
  (in millions)
Natural gas derivatives
Unrealized net gains (losses)Cost of sales$$(14)$13 
Realized net (losses) gainsCost of sales(13)(2)
Net derivative (losses) gains$(7)$(10)$11 
The fair values of derivatives on our consolidated balance sheets are shown below. As of December 31, 20172020 and 2016,2019, none of our derivative instruments were designated as hedging instruments. See Note 8—9—Fair Value Measurements for additional information on derivative fair values.
 Asset Derivatives Liability Derivatives
 
Balance Sheet
Location
 December 31, 
Balance Sheet
Location
 December 31,
  2017 2016  2017 2016
   (in millions)   (in millions)
Natural gas derivativesOther current assets $1
 $52
 Other current liabilities $(12) $
Natural gas derivativesOther assets 
 4
 Other liabilities 
 (6)
Total derivatives  $1
 $56
   $(12) $(6)
Asset DerivativesLiability Derivatives
 Balance Sheet
Location
December 31,Balance Sheet
Location
December 31,
 2020201920202019
  (in millions) (in millions)
Natural gas derivativesOther current assets$$Other current liabilities$(7)$(12)
The counterparties to our derivative contracts are multinational commercial banks, major financial institutions and large energy companies. Our derivativesderivative contracts are executed with several counterparties generally under International Swaps and Derivatives Association (ISDA) agreements. The ISDA agreements are master netting arrangements commonly used for OTC derivatives that mitigate exposure to counterparty credit risk, in part, by creating contractual rights of netting and setoff, the specifics of which vary from agreement to agreement. These rights are described further below:
Settlement netting generally allows us and our counterparties to net, into a single net payable or receivable, ordinary settlement obligations arising between us under the ISDA agreement on the same day, in the same currency, for the same types of derivative instruments, and through the same pairing of offices.
Close-out netting rights are provided in the event of a default or other termination event (as defined in the ISDA agreements), including bankruptcy. Depending on the cause of early termination, the non-defaulting party may elect to terminate all or some transactions outstanding under the ISDA agreement. The values of all terminated transactions and certain other payments under the ISDA agreement are netted, resulting in a single net close-out amount payable to or by the non-defaulting party. Termination values may be determined using a mark-to-market approach or based on a party's good faith estimate of its loss. If the final net close-out amount is payable by the non-defaulting party, that party's obligation to make the payment may be conditioned on factors such as the termination of all derivative transactions between the parties or payment in full of all of the defaulting party's obligations to the non-defaulting party, in each case regardless of whether arising under the ISDA agreement or otherwise.
Setoff rights are provided by certain of our ISDA agreements and generally allow a non-defaulting party to elect to set off, against the final net close-out payment, other matured and contingent amounts payable between us and our
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counterparties under the ISDA agreement or otherwise. Typically, these setoff rights arise upon the early termination of all transactions outstanding under an ISDA agreement following a default or specified termination event.

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Most of our ISDA agreements contain credit-risk-related contingent features such as cross default provisions and credit support thresholds.provisions. In the event of certain defaults or a credit ratings downgrade,termination events, our counterpartycounterparties may request early termination and net settlement of certain derivative trades or, under certain ISDA agreements, may require us to collateralize derivatives in a net liability position. The Revolving Credit Agreement, at any time when it is secured, provides a cross collateral feature for those of our derivatives that are with counterparties that are party to, or affiliates of parties to, the Revolving Credit Agreement so that no separate collateral would be required for those counterparties in connection with such derivatives. In the event the Revolving Credit Agreement becomes unsecured, separate collateral could be required in connection with such derivatives. As of December 31, 20172020 and 2016,2019, the aggregate fair value of the derivative instruments with credit-risk-related contingent features in net liability positions was $12$6 million and zero,$12 million, respectively, which also approximates the fair value of the maximum amount of additional collateral that wouldmay need to be posted or assets that may be needed to settle the obligations if the credit-risk-related contingent features were triggered at the reporting dates. As of December 31, 20172020 and 2016,2019, we had no0 cash collateral on deposit with counterparties for derivative contracts. The credit support documents executed in connection with certain of our ISDA agreements generally provide us and our counterparties the right to set off collateral against amounts owing under the ISDA agreements upon the occurrence of a default or a specified termination event.
The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of December 31, 20172020 and 2016:2019:
Amounts presented in consolidated
balance sheets(1)
Gross amounts not offset in consolidated balance sheets
Amounts presented in consolidated
balance sheets(1)
 Gross amounts not offset in consolidated balance sheets   Financial
instruments
Cash collateral received (pledged)Net
amount
 
Financial
instruments
 Cash collateral received (pledged) 
Net
amount
(in millions)
(in millions)
December 31, 2017 
  
  
  
December 31, 2020December 31, 2020    
Total derivative assets$1
 $1
 $
 $
Total derivative assets$$$$
Total derivative liabilities(12) (1) 
 (11)Total derivative liabilities(7)(7)
Net derivative liabilities$(11) $
 $
 $(11)Net derivative liabilities$(6)$$$(6)
December 31, 2016 
  
  
  
December 31, 2019December 31, 2019    
Total derivative assets$56
 $6
 $
 $50
Total derivative assets$$$$
Total derivative liabilities(6) (6) 
 
Total derivative liabilities(12)(12)
Net derivative assets$50
 $
 $
 $50
Net derivative liabilitiesNet derivative liabilities$(12)$$$(12)

(1)
(1)We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheets. As a result, the gross amounts recognized and net amounts presented are the same.
We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheets. As a result, the gross amounts recognized and net amounts presented are the same.
We do not believe the contractually allowed netting, close-out netting or setoff of amounts owed to, or due from, the counterparties to our ISDA agreements would have a material effect on our financial position.
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16.   Supplemental Balance Sheet Data
Accounts ReceivableNet
Accounts receivable—net consist of the following:
 December 31,
 2017 2016
 (in millions)
Trade$297
 $227
Other10
 9
Accounts receivable—net$307
 $236
Trade accounts receivable is net of an allowance for doubtful accounts of $3 million as of December 31, 2017 and 2016.

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 December 31,
 20202019
 (in millions)
Trade$256 $229 
Other13 
Accounts receivable—net$265 $242 
Inventories
Inventories consist of the following:
 December 31,
 2017 2016
 (in millions)
Finished goods$233
 $279
Raw materials, spare parts and supplies42
 60
Total inventories$275
 $339
 December 31,
 20202019
 (in millions)
Finished goods$246 $311 
Raw materials, spare parts and supplies41 40 
Total inventories$287 $351 
Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consist of the following:
 December 31,
 2017 2016
 (in millions)
Accounts payable$99
 $81
Capacity expansion project costs
 185
Accrued natural gas costs109
 111
Payroll and employee-related costs65
 46
Accrued interest38
 53
Other161
 162
Accounts payable and accrued expenses$472
 $638
Capacity expansion project costs included the capital expenditures invested in the capacity expansion projects. We completed our capacity expansion projects at Donaldsonville, Louisiana and Port Neal, Iowa in December 2016.
 December 31,
 20202019
 (in millions)
Accounts payable$85 $78 
Accrued natural gas costs106 88 
Payroll and employee-related costs68 81 
Accrued interest32 32 
Other133 158 
Total accounts payable and accrued expenses$424 $437 
Payroll and employee-related costs include accrued salaries and wages, vacation, benefits, incentive plans and payroll taxes.
Accrued interest includes interest payable on our outstanding senior notes. See Note 11—12—Financing Agreements and Note 12—13—Interest Expense for additional information.
Other includes accrued utilities, property and other taxes, sales incentives and other credits, accrued litigation settlement costs, accrued transaction costs, maintenance and professional services.
Other Current Liabilities
As of December 31, 2017,2020, other current liabilities of $17$15 million consists of $12primarily includes $7 million of unrealized loss on natural gas derivatives and $5 million ofrepresenting the current portion of the unrealized loss on the embedded derivative liability related to our strategic venture with CHS. See Note 8—Fair Value Measurements, Note 14—Derivative Financial Instruments and Note 16—Noncontrolling Interests for additional information.
As of December 31, 2016,2019, other current liabilities of $18 million primarily includes $12 million of unrealized loss on natural gas derivatives and $5 million consists ofrepresenting the current portion of the unrealized loss on the embedded derivative liability related to our strategic venture with CHS.

See Note 9—Fair Value Measurements, Note 15—Derivative Financial Instruments and Note 17—Noncontrolling Interests for additional information.
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Other Liabilities
Other liabilities consist of the following:
December 31, December 31,
2017 2016 20202019
(in millions) (in millions)
Benefit plans and deferred compensation$324
 $393
Benefit plans and deferred compensation$256 $298 
Tax-related liabilities93
 103
Tax-related liabilities155 147 
Unrealized losses on derivatives
 6
Unrealized loss on embedded derivative20
 21
Unrealized loss on embedded derivative13 15 
Environmental and related costs7
 8
Other16
 14
Other20 14 
Other liabilities$460
 $545
Other liabilities$444 $474 
Benefit plans and deferred compensation include liabilities for pensions, retiree medical benefits, and the noncurrent portion of incentive plans. See Note 10—11—Pension and Other Postretirement Benefits for additional information.
16.17.     Noncontrolling Interests
A reconciliation of the beginning and ending balances of noncontrolling interests and distributions payable to the noncontrolling interests on our consolidated balance sheets is provided below.
Year ended December 31, Year ended December 31,
2017 2016 2015 202020192018
CFN TNCLP Total CFN TNCLP Total TNCLP CFNCFNCFNTNCLPTotal
  (in millions) (in millions)
Noncontrolling interests:   
  
      
  
Noncontrolling interests:
Beginning balance$2,806
 $338
 $3,144
 $
 $352
 $352
 $363
Issuance of noncontrolling interest in CFN
 
 
 2,792
 
 2,792
 
Balance as of January 1Balance as of January 1$2,740 $2,773 $2,772 $333 $3,105 
Earnings attributable to noncontrolling interests73
 19
 92
 93
 26
 119
 34
Earnings attributable to noncontrolling interests115 153 130 138 
Declaration of distributions payable(107) (24) (131) (79) (40) (119) (45)Declaration of distributions payable(174)(186)(129)(10)(139)
Ending balance$2,772
 $333
 $3,105
 $2,806
 $338
 $3,144
 $352
Purchase of TNCLP Public UnitsPurchase of TNCLP Public Units(331)(331)
Balance as of December 31Balance as of December 31$2,681 $2,740 $2,773 $$2,773 
Distributions payable to noncontrolling interests: 
  
  
      
  
Distributions payable to noncontrolling interests:
Beginning balance$
 $
 $
 $
 $
 $
 $
Balance as of January 1Balance as of January 1$$$$$
Declaration of distributions payable107
 24
 131
 79
 40
 119
 45
Declaration of distributions payable174 186 129 10 139 
Distributions to noncontrolling interests(107) (24) (131) (79) (40) (119) (45)Distributions to noncontrolling interests(174)(186)(129)(10)(139)
Ending balance$
 $
 $
 $
 $
 $
 $
Balance as of December 31Balance as of December 31$$$$$
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CF Industries Nitrogen, LLC (CFN)
We commencedhave a strategic venture with CHS on February 1, 2016, atunder which time CHS purchased a minorityowns an equity interest in CFN, a subsidiary of CF Holdings, for $2.8 billion, which representedrepresents approximately 11% of the membership interestinterests of CFN. We own the remaining membership interest.interests. Under the terms of CFN'sCFN’s limited liability company agreement, each member’s interest will reflect, over time, the impact of the profitability of CFN, and any member contributions made to CFN and withdrawals and distributions received from CFN. For financial reporting purposes, the assets, liabilities and earnings of the strategic venture are consolidated into our financial statements. CHS'CHS’ interest in the strategic venture is recorded in noncontrolling interests in our consolidated financial statements. On February 1, 2016, CHS also began receivingreceives deliveries pursuant to a supply agreement under which CHS has the right to purchase annually from CFN up to approximately 1.1 million tons of granular urea and 580,000 tons of UAN at market prices. As a result of its minority equity interest in CFN, CHS is entitled to semi-annual cash distributions from CFN. We are also entitled to semi-annual cash distributions from CFN. The amounts of distributions from CFN to us and CHS are based generally on the profitability of CFN and determined based on the volume of granular urea and UAN sold by CFN to us and CHS pursuant to supply agreements, less a formula driven amount based primarily on the cost of natural gas used to produce the granular urea and UAN, and adjusted for the allocation of items such as operational efficiencies and overhead amounts.
Additionally, under the terms of the strategic venture, ifwe recognized an embedded derivative related to our credit rating as determined by two of three specified credit rating agencies is below certain levels , we are required to make a non-refundable yearly payment of $5 million to CHS. In 2016, our credit ratings were reduced and we made a payment to CHS. In 2017, since our credit ratings had not changed, we made a second $5 million payment to CHS. The payment will continue on a yearly basis until the earlier of the date that our credit rating is upgraded to or above certain levels by two of the three specified credit rating agencies or February 1, 2026. This obligation is recognized on our consolidated balance sheets as an embedded derivative. As of December 31, 2017 and 2016, the embedded derivative liability of $25 million and $26 million, respectively, is included in other current liabilities and other liabilities on our consolidated balance sheets. Included in other operating—net in our consolidated statements of operations for the years ended December 31, 2017 and 2016 is a net loss of $4 million and $23 million, respectively.rating. See Note 8—9—Fair Value Measurements for additional information.
In the first quarter of 2018,On January 31, 2021, the CFN Board of Managers approved semi-annual distribution payments for the distribution period ended December 31, 20172020 in accordance with the Second Amended and Restated Limited Liability Company Agreement of CFN.CFN’s limited liability company agreement. On January 31, 2018,February 1, 2021, CFN distributed $49$64 million to CHS for the distribution period ended December 31, 2017.2020.
Terra Nitrogen Company, L.P. (TNCLP)
On February 7, 2018, we announced that, in accordance with the terms of TNCLP’s First Amended and Restated Agreement of Limited Partnership (as amended by Amendment No. 1 to the First Amended and Restated Agreement of Limited Partnership, the TNCLP isAgreement of Limited Partnership), Terra Nitrogen GP Inc. (TNGP), the sole general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP (the TNCLP Public Units). On April 2, 2018, TNGP completed its purchase of the TNCLP Public Units (the Purchase) for an aggregate cash purchase price of $388 million, at which time we recognized a reduction in paid-in capital of $62 million; a deferred tax liability of $5 million; and the removal of the TNCLP noncontrolling interests, as shown in the table above. Upon completion of the Purchase, CF Holdings owned, through its subsidiaries, 100 percent of the general and limited partnership interests of TNCLP.
Prior to April 2, 2018, TNCLP was a master limited partnership (MLP) that ownsowned a nitrogen fertilizer manufacturing facility in Verdigris, Oklahoma. We ownowned approximately 75.3% of TNCLP through general and limited partnership interests. Outsideinterests and outside investors ownowned the remaining approximately 24.7% of the limited partnership.partnership interests. For financial reporting purposes, the assets, liabilities and earnings of the partnership arewere consolidated into our financial statements. The outside investors'investors’ limited partnership interests in the partnership areTNCLP were recorded in noncontrolling interests in our consolidated financial statements. The noncontrolling interest representsrepresented the noncontrolling unitholders'unitholders’ interest (prior to the Purchase) in the earnings and equity of TNCLP. Affiliates of CF Industries arewere required to purchase all of TNCLP's fertilizerTNCLP’s nitrogen products at market prices as defined in the Amendment to the General and Administrative Services and Product Offtake Agreement, dated September 28, 2010.
Prior to April 2, 2018, TNCLP makesmade cash distributions to the general and limited partners based on formulas defined within its First Amended and Restated Agreement of Limited Partnership (as amended, the TNCLP Agreement of Limited Partnership).Partnership. Cash available for distribution (Available Cash) iswas defined in the TNCLP Agreement of Limited Partnership generally as all cash receipts less all cash disbursements, less certain reserves (including reserves for future operating and capital needs) established as the general partner determinesdetermined in its reasonable discretion to be necessary or appropriate. Changes in working capital affectaffected Available Cash, as increases in the amount of cash invested in working capital items (such as increases in receivables or inventory and decreases in accounts payable) reducereduced Available Cash, while declines in the amount of cash invested in working capital items increaseincreased Available Cash. Cash distributions to the limited partners and general partner varyvaried depending on the extent to which the cumulative distributions exceedexceeded certain target threshold levels set forth in the TNCLP Agreement of Limited Partnership.
In each quarter of 2017, 2016 and 2015, the minimum quarterly distributions requirements under the TNCLP Agreement of Limited Partnership were satisfied, which entitled TNGP, the general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, to receive incentive distributions on its general partner interests (in addition to minimum quarterly distributions). TNGP has assigned its right to receive such incentive distributions to an affiliate of TNGP that is also an indirect wholly owned subsidiary of CF Holdings. The earnings attributed to our general partner interest in excess of the threshold levels for the years ended December 31, 2017, 2016 and 2015 were $41 million, $65 million and $116 million, respectively.


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On February 7, 2018, we announced that TNGP elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP on April 2, 2018, for a cash purchase price of $84.033 per unit in accordance with the terms of TNCLP’s partnership agreement. The purchase price of $84.033 per unit was determined under the terms of TNCLP’s partnership agreement as the average of the daily closing prices per common unit for the 20 consecutive trading days beginning with January 5, 2018 and ending with February 2, 2018. The purchase price of all of the 4,612,562 publicly traded common units of TNCLP is approximately $390 million. We intend to fund the purchase with cash on hand. As of the April 2, 2018 purchase date, all rights of the holders of the units will terminate, with the exception of the right to receive payment of the purchase price. Upon completion of the purchase, we will own 100 percent of the general and limited partnership interests of TNCLP, and the common units representing limited partner interests will cease to be publicly traded or listed on the New York Stock Exchange.
Internal Revenue Service Regulation Impacting Master Limited Partnerships
Currently, no federal income taxes are paid by TNCLP due to its MLP status. Partnerships are generally not subject to federal income tax, although publicly-traded partnerships (such as TNCLP) are treated as corporations for federal income tax purposes (and therefore are subject to federal income tax), unless at least 90% of the partnership's gross income is "qualifying income" as defined in Section 7704 of the Internal Revenue Code of 1986, as amended, and the partnership is not required to register as an investment company under the Investment Company Act of 1940. Any change in the tax treatment of income from fertilizer-related activities as qualifying income could cause TNCLP to be treated as a corporation for federal income tax purposes. If TNCLP were taxed as a corporation, under current law, due to its current ownership interest, CF Industries would qualify for a partial dividends received deduction on the dividends received from TNCLP. Therefore, we would not expect a change in the tax treatment of TNCLP to have a material impact on the consolidated financial condition or results of operations of CF Holdings.
On January 19, 2017, the Internal Revenue Service (IRS) issued final regulations on the types of income and activities that constitute or generate qualifying income of a MLP. For calendar year MLPs, the effective date of the regulations is January 1, 2018. The regulations have the effect of limiting the types of income and activities that qualify under the MLP rules, subject to certain transition provisions. The regulations define the activities that generate qualifying income from certain processing or refining and transportation activities with respect to any mineral or natural resource (including fertilizer) as activities that generate qualifying income, but the regulations reserve on specifics regarding fertilizer-related activities. We continue to monitor these IRS regulatory activities.

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17.   Stockholders'18.   Stockholders’ Equity
Common Stock
Our Board of Directors (the Board) has authorized certain programs to repurchase shares of our common stock. These programs have generally permitted repurchases to be made from time to time in the open market, through privately-negotiated transactions, through block transactions or otherwise. Our management has determined the manner, timing and amount of repurchases under these programs based on the evaluation of market conditions, stock price and other factors.
On August 6, 2014,1, 2018, the Board authorized a programthe repurchase of up to $500 million of CF Holdings common stock through June 30, 2020 (the 2018 Share Repurchase Program). In 2018, we completed the 2018 Share Repurchase Program with the repurchase of 10.9 million shares for $500 million, of which $33 million was accrued and unpaid at December 31, 2018.
On February 13, 2019, the Board authorized the repurchase of up to $1 billion of theCF Holdings common stock of CF Holdings through December 31, 20162021 (the 20142019 Share Repurchase Program). The following table summarizes the share repurchasesIn 2019, we repurchased approximately 7.6 million shares under the 2014 Program.
 2014 Program
 Shares Amounts
 (in millions)
Shares repurchased as of December 31, 2014 
7.0
 $373
Shares repurchased in 2015:   
First quarter4.1
 $237
Second quarter4.5
 268
Third quarter0.3
 22
Fourth quarter
 
Total shares repurchased in 20158.9
 527
Shares repurchased as of December 31, 201515.9
 $900
2019 Share Repurchase Program for $337 million. In 2020, we repurchased approximately 2.6 million shares under the 2019 Share Repurchase Program for $100 million.
In 2016, no shares were repurchased under the 2014 Program. The 2014 Program expired on December 31, 2016 with$100 million of repurchase authorization remaining. No share repurchase programs were authorized by the Board in 2017.
During 2016 and 2015,2019, we retired 2.418.6 million shares and 10.7 million shares, respectively, of repurchased stock. The retired shares were returned to the status of authorized but unissued shares. As part of the retirements, we reduced our treasury stock, paid-in capital and retained earnings balances for 20162019 by $150$843 million, $14$110 million and $136$733 million, respectively,respectively. We held no shares in treasury of repurchased stock as of December 31, 2019.
In 2020, we retired 2.8 million shares of repurchased stock. The retired shares were returned to the status of authorized but unissued shares. As part of the retirements, we reduced our treasury stock, paid-in capital and retained earnings balances for 20152020 by $597$107 million, $62$17 million and $535$90 million, respectively. As of December 31, 2017, 2016 and 2015,2020, we held 102,843 shares in treasury approximately one thousand shares, 28 thousand shares and 2.4 million shares, respectively, of repurchased stock.
Changes in common shares outstanding are as follows:
Year ended December 31, Year ended December 31,
2017 2016 2015 202020192018
Beginning balance233,114,169
 233,081,556
 241,673,050
Beginning balance216,023,826 222,818,495 233,287,089 
Exercise of stock options90,938
 17,600
 274,705
Exercise of stock options321,465 629,186 462,647 
Issuance of restricted stock(1)
93,833
 44,941
 40,673
Issuance of restricted stock(1)
552,362 267,165 68,803 
Forfeitures of restricted stock
 (10,000) 
Purchase of treasury shares(2)
(11,851) (19,928) (8,906,872)
Purchase of treasury shares(2)
(2,942,795)(7,691,020)(11,000,044)
Ending balance233,287,089
 233,114,169
 233,081,556
Ending balance213,954,858 216,023,826 222,818,495 

(1)
Includes shares issued from treasury.
(2)
Includes shares withheld to pay employee tax obligations upon the vesting of restricted stock.

(1)Includes shares issued from treasury.
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restricted stock or the exercise of stock options.
Preferred Stock
CF Holdings is authorized to issue 50 million shares of $0.01 par value preferred stock. Our Second Amended and Restated Certificate of Incorporation, as amended, authorizes the Board, without any further stockholder action or approval, to issue these shares in one or more classes or series, and (except in the case of our Series A Junior Participating Preferred Stock, 500,000 shares of which are authorized and the terms of which were specified in the original certificate of incorporation of CF Holdings) to fix the rights, preferences and privileges of the shares of each wholly unissued class or series and any of its qualifications, limitations or restrictions. The Series A Junior Participating Preferred Stock had been established in CF Holdings’ original certificate of incorporation in connection with our former stockholder rights plan that expired in 2015. In September 2016, in connection with the Plan (as defined below), 500,000 shares of preferred stock were designated as Series B Junior Participating Preferred Stock. In July 2017, the Series B Junior Participating Preferred Stock was eliminated in connection with the expiration of the Plan. No shares of preferred stock have been issued.
Tax Benefits Preservation Plan
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As of December 31, 2016, we had a stockholders rights plan intended to help protect our tax net operating losses and certain other tax assets by deterring any person from becoming a "5-percent shareholder" (as defined in Section 382 of the Internal Revenue Code of 1986, as amended). The terms of the rights were set forth in a Tax Benefits Preservation Plan (the Plan) dated as of September 6, 2016 and amended as of July 25, 2017 between us and Computershare Trust Company, N.A., as rights agent. The rights expired on July 25, 2017 without having been exercised.CF INDUSTRIES HOLDINGS, INC.


Accumulated Other Comprehensive (Loss) IncomeLoss
Changes to accumulated other comprehensive (loss) income (AOCI)loss and the impact on other comprehensive income (loss) are as follows:
 Foreign
Currency
Translation
Adjustment
Unrealized
Gain (Loss)
on
Securities
Unrealized
Gain (Loss)
on
Derivatives
Defined
Benefit
Plans
Accumulated
Other
Comprehensive
Loss
 (in millions)
Balance as of December 31, 2017$(145)$$$(123)$(263)
Adoption of ASU 2016-01(1)
(1)(1)
Adoption of ASU 2018-02(2)
(11)(10)
Gain arising during the period
Reclassification to earnings(3)
Effect of exchange rate changes and deferred taxes(105)(102)
Balance as of December 31, 2018(250)(126)(371)
Loss arising during the period(62)(62)
Reclassification to earnings(3)
(2)(2)
Effect of exchange rate changes and deferred taxes62 69 
Balance as of December 31, 2019(188)(183)(366)
Gain arising during the period
Reclassification to earnings(3)
(1)
Effect of exchange rate changes and deferred taxes44 (4)40 
Balance as of December 31, 2020$(144)$$$(180)$(320)

(1)     On January 1, 2018, we adopted ASU No. 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which changes the income statement impact of equity investments held by an entity. The amendments require the unrealized gains or losses of equity instruments measured at fair value to be recognized in net earnings. Our adoption of this ASU resulted in an increase to opening retained earnings of $1 million representing the cumulative effect of unrealized gains from equity securities from accumulated other comprehensive loss.
 
Foreign
Currency
Translation
Adjustment
 
Unrealized
Gain (Loss)
on
Securities
 
Unrealized
Gain (Loss)
on
Derivatives
 
Defined
Benefit
Plans
 
Accumulated
Other
Comprehensive
(Loss) Income
 (in millions)
Balance as of December 31, 2014$(41) $1
 $5
 $(125) $(160)
Reclassification to earnings
 1
 
 6
 7
Impact of CF Fertilisers UK acquisition9
 
 
 38
 47
Gain arising during the period
 
 
 24
 24
Effect of exchange rate changes and deferred taxes(166) (1) 
 (1) (168)
Balance as of December 31, 2015(198) 1
 5
 (58) (250)
Unrealized loss
 (1) 
 
 (1)
Reclassification to earnings
 1
 
 1
 2
Loss arising during the period
 
 
 (97) (97)
Effect of exchange rate changes and deferred taxes(74) 
 
 22
 (52)
Balance as of December 31, 2016(272) 1
 5
 (132) (398)
Reclassification to earnings
 
 (1) 1
 
Gain arising during the period
 
 
 19
 19
Effect of exchange rate changes and deferred taxes127
 
 
 (11) 116
Balance as of December 31, 2017$(145) $1
 $4
 $(123) $(263)
(2)     In the fourth quarter of 2018, we adopted ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allowed a reclassification from accumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. As a result of our adoption of this ASU, we reclassified $10 million of stranded tax effects previously recognized in accumulated other comprehensive loss to retained earnings during the fourth quarter of 2018.

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(3)Reclassifications out of AOCIaccumulated other comprehensive loss to the consolidated statements of operations for the years ended December 31, 2017, 2016 and 2015 were as follows:not material.
 Year ended December 31,
 2017 2016 2015
 (in millions)
Foreign Currency Translation Adjustment     
CF Fertilisers UK equity method investment remeasurement(1)
$
 $
 $9
Total before tax
 
 9
Tax effect
 
 
Net of tax$
 $
 $9
Unrealized Gain (Loss) on Securities 
    
Available-for-sale securities(2)
$
 $1
 $1
Total before tax
 1
 1
Tax effect
 
 (1)
Net of tax$
 $1
 $
Unrealized Gain (Loss) on Derivatives     
Reclassification of de-designated hedges$(1) $
 $
Total before tax(1) 
 
Tax effect
 
 
Net of tax$(1) $
 $
Defined Benefit Plans 
  
  
CF Fertilisers UK equity method investment remeasurement(1)
$
 $
 $38
Amortization of prior service cost (benefit)(3)
(1) (1) (1)
Amortization of net loss(3)
2
 2
 7
Total before tax1
 1
 44
Tax effect
 
 (2)
Net of tax$1
 $1
 $42
Total reclassifications for the period$
 $2
 $51

(1)
Represents the amount that was reclassified from AOCI into equity in earnings of non-operating affiliates—net of taxes as a result of the remeasurement to fair value of our initial 50% equity interest in CF Fertilisers UK.
(2)
Represents the balance that was reclassified into interest income.
(3)
These components are included in the computation of net periodic pension cost and were reclassified from AOCI into cost of sales and selling, general and administrative expenses.







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18.   Stock-Based19.   Stock-based Compensation
2014 Equity and Incentive Plan
On May 14, 2014, our shareholders approved the CF Industries Holdings, Inc. 2014 Equity and Incentive Plan (the 2014 Equity and Incentive Plan) which replaced the CF Industries Holdings, Inc. 2009 Equity and Incentive Plan. Under the 2014 Equity and Incentive Plan, we may grant incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance awards (payable in cash or stock) and other stock-based awards to our officers, employees, consultants and independent contractors (including non-employee directors). The purpose of the 2014 Equity and Incentive Plan is to provide an incentive for our employees, officers, consultants and non-employee directors that is aligned with the interests of our stockholders.shareholders.
Share Reserve and Individual Award Limits
The maximum number of shares reserved for the grant of awards under the 2014 Equity and Incentive Plan is the sum of (i) 13.9 million and (ii) the number of shares subject to outstanding awards under our predecessor plans to the extent such awards terminate or expire without delivery of shares. For purposes of determining the number of shares of stock available for grant under the 2014 Equity and Incentive Plan, each option or stock appreciation right is counted against the reserve as one1 share. Each share of stock granted, other than an option or a stock appreciation right, is counted against the reserve as 1.61 shares. If any outstanding award expires or is settled in cash, any unissued shares subject to the award are again available for grant under the 2014 Equity and Incentive Plan. Shares tendered in payment of the exercise price of an option and shares withheld by the Company or otherwise received by the Company to satisfy tax withholding obligations are not available for future grant under the 2014 Equity and Incentive Plan. As of December 31, 2017,2020, we had 9.56.0 million shares available for future awards under the 2014 Equity and Incentive Plan. The 2014 Equity and Incentive Plan provides that no more than 5.0 million shares underlying sharesawards of stock options and stock appreciation rights may be granted to a participant in any one calendar year.
Stock Options
Under the 2014 Equity and Incentive Plan and our predecessor plans, we granted to plan participants nonqualified stock options to purchase shares of our common stock. The exercise price of these options is equal to the market price of our common stock on the date of grant. The contractual life of each option is ten years and generally one-third of the options vest on each of the first three anniversaries of the date of grant.
The fair value of each stock option award is estimated using the Black-Scholes option valuation model. Key assumptions used and resulting grant date fair values are shown in the following table.
 2017 2016 2015
Weighted-average assumptions:     
Expected term of stock options4.3 Years 4.3 Years 4.3 Years
Expected volatility40% 39% 31%
Risk-free interest rate1.9% 1.2% 1.5%
Expected dividend yield3.9% 3.3% 1.9%
Weighted-average grant date fair value$7.66 $8.97 $13.99
The expected volatility of our stock options is based on the combination of the historical volatility of our common stock and implied volatilities of exchange traded options on our common stock. The expected term of options is estimated based on our historical exercise experience, post-vesting employment termination behavior and the contractual term. The risk-free interest rate is based on the U.S. Treasury Strip yield curve in effect at the time of grant for the expected term of the options.

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A summary of stock option activity during the year ended December 31, 2017 is presented below:
 Shares 
Weighted-
Average
Exercise Price
Outstanding as of December 31, 20164,905,272
 $40.18
Granted1,790,100
 31.00
Exercised(90,938) 16.48
Forfeited(104,424) 34.96
Expired(67,276) 48.15
Outstanding as of December 31, 20176,432,734
 37.97
Exercisable as of December 31, 20173,568,992
 40.16
Selected amounts pertaining to stock option exercises are as follows:
 2017 2016 2015
 (in millions)
Cash received from stock option exercises$1
 $
 $8
Actual tax benefit realized from stock option exercises$1
 $
 $2
Pre-tax intrinsic value of stock options exercised$2
 $
 $8
The following table summarizes information about stock options outstanding and exercisable as of December 31, 2017:
 Options Outstanding Options Exercisable
Range of
Exercise Prices
Shares 
Weighted-
Average
Remaining
Contractual
Term
(years)
 
Weighted-
Average
Exercise Price
 
Aggregate
Intrinsic
Value(1)
(in millions)
 Shares 
Weighted-
Average
Remaining
Contractual
Term
(years)
 
Weighted-
Average
Exercise Price
 
Aggregate
Intrinsic
Value(1)
(in millions)
$  9.73 - $20.00502,120
 2.2 $15.39
 $14
 502,120
 2.2 $15.39
 $14
$20.01 - $62.255,930,614
 7.2 39.88
 36
 3,066,872
 5.6 44.22
 10
 6,432,734
 6.8 37.97
 $50
 3,568,992
 5.4 40.16
 $24

(1)
The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $42.54 as of December 31, 2017, which would have been received by the option holders had all option holders exercised their options as of that date.
Restricted Stock Awards, Restricted Stock Units and Performance ShareRestricted Stock Units
The fair value of a restricted stock award (RSA) or an award ofa restricted stock unitsunit (RSU) is equal to the number of shares subject to the award multiplied by the closing market price of our common stock on the date of grant. We estimated the fair value of each performance sharerestricted stock unit (PSU) on the date of grant using a Monte Carlo simulation. RSU and PSU awardsGenerally, RSUs vest in three equal annual installments following the date of grant. PSUs are granted to key employees and generally vest three years from the date of grant. The vesting of PSUs is alsogrant subject to the attainment of applicable performance goals during the performance period. The RSAs awarded to non-management members of the Board vest the earlier of one year from the date of the grant or the date of the next annual stockholder meeting. During the vesting period, the holders of the RSAs are entitled to dividends and voting rights. During the vesting period, the holders of the RSUs are paid dividend equivalents in cash to the extent we pay cash dividends. PSUs accrue dividend equivalents to the extent we pay cash dividends on our common stock during the performance and vesting period.periods. Upon vesting of the PSUs, holders are paid the accrued dividend equivalentscash equivalent of the dividends paid during the performance and vesting periods based on the shares of common stock, if any, delivered in settlement of PSUs. Holders of RSUs and PSUs are not entitled to voting rights unless and until the awards have vested.

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A summary of restricted stock activity during the year ended December 31, 20172020 is presented below:below.
Restricted Stock AwardsRestricted Stock UnitsPerformance Restricted Stock Units
Restricted Stock Awards Restricted Stock Units Performance Share Units SharesWeighted-
Average
Grant-Date
Fair Value
SharesWeighted-
Average
Grant-Date
Fair Value
SharesWeighted-
Average
Grant-Date
Fair Value
Shares 
Weighted-
Average
Grant-Date
Fair Value
 Shares 
Weighted-
Average
Grant-Date
Fair Value
 Shares Weighted-Average Grant-Date Fair Value
Outstanding as of December 31, 201641,645
 $27.85
 158,723
 $44.38
 106,715
 $59.48
Outstanding as of December 31, 2019Outstanding as of December 31, 201936,567 $41.84 693,960 $40.14 304,834 $44.42 
Granted51,258
 27.31
 159,220
 31.20
 61,550
 45.37
Granted50,895 27.51 316,154 45.23 210,869 47.93 
Restrictions lapsed (vested)(1)
(41,645) 27.85
 (42,575) 49.55
 (25,625) 77.65
Restrictions lapsed (vested)(1)
(36,567)41.84 (372,855)38.36 (58,460)48.68 
Forfeited
 
 (5,123) 39.98
 (2,059) 72.98
Forfeited(23,165)44.13 (11,745)45.97 
Outstanding as of December 31, 201751,258
 27.31
 270,245
 35.88
 140,581
 49.79
Outstanding as of December 31, 2020Outstanding as of December 31, 202050,895 27.51 614,094 43.70 445,498 45.72 

(1)For performance restricted stock units, the shares represent the performance restricted stock units granted in 2017, for which the three-year performance period ended December 31, 2019.
(1)
For performance share units, the shares represent the performance share units granted in 2014, for which the three year performance period ended December 31, 2016. Because the applicable performance goals were not met, no common shares were delivered in settlement of these units.
The 2017, 20162020, 2019 and 20152018 weighted-average grant date fair value for RSAs was $27.31, $27.85,$27.51, $41.84, and $61.54,$40.40, for RSUs was $31.20, $36.00,$45.23, $41.94, and $61.60,$43.09, and for PSUs was $45.37, $40.62,$47.93, $43.09, and $91.13,$44.59, respectively.
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The actual tax benefit realized from restricted stock vested in each of the years ended December 31, 2020, 2019 and 2018 was $5 million, $3 million and $1 million, respectively. The fair value of restricted stock vested was $22 million, $11 million and $3 million for the years ended December 31, 2020, 2019 and 2018, respectively.
Stock Options
Under the 2014 Equity and Incentive Plan and our predecessor plans, we have granted to plan participants nonqualified stock options to purchase shares of our common stock. The exercise price of these options was equal to the market price of our common stock on the date of grant. The contractual life of each option was ten years and generally one-third of the options vested on each of the first three anniversaries of the date of grant. No stock option awards have been granted to plan participants since 2017.
A summary of stock option activity during the year ended December 31, 2020 is presented below:
 SharesWeighted-
Average
Exercise Price
Outstanding as of December 31, 20195,059,892 $39.88 
Exercised(321,465)25.95 
Forfeited(6,527)30.95 
Expired(162,859)52.86 
Outstanding as of December 31, 20204,569,041 40.41 
Exercisable as of December 31, 20204,569,041 40.41 
 Weighted-
Average
Remaining
Contractual
Term
(years)
Aggregate
Intrinsic
Value
(1)
(in millions)
Outstanding as of December 31, 20204.2$15 
Exercisable as of December 31, 20204.2$15 

(1)The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $38.71 as of December 31, 2020, which would have been received by the option holders had all option holders exercised their options as of that date.
Selected amounts pertaining to restricted stock awards that vestedoption exercises are as follows:
 Year ended December 31,
 2017 2016 2015
 (in millions)
Actual tax benefit realized from restricted stock vested$1
 $1
 $1
Fair value of restricted stock vested$2
 $2
 $5
202020192018
 (in millions)
Cash received from stock option exercises$$18 $12 
Actual tax benefit realized from stock option exercises$$$
Pre-tax intrinsic value of stock options exercised$$12 $10 
Compensation Cost
Compensation cost is recorded primarily in selling, general and administrative expenses. The following table summarizes stock-based compensation costs and related income tax benefits.benefits:
Year ended December 31, Year ended December 31,
2017 2016 2015 202020192018
(in millions) (in millions)
Stock-based compensation expense$17
 $19
 $17
Stock-based compensation expense$26 $28 $21 
Income tax benefit(6) (7) (6)Income tax benefit(6)(6)(4)
Stock-based compensation expense, net of income taxes$11
 $12
 $11
Stock-based compensation expense, net of income taxes$20 $22 $17 
As of December 31, 2017,2020, pre-tax unrecognized compensation cost was $14 million for stock options, which will be recognized over a weighted-average period of 1.8 years, $6 million for RSAs and RSUs, which will be recognized over a weighted-average period of 1.81.7 years, and $3$7 million for PSUs, which will be recognized over a weighted-average period of 1.81.3 years.
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Excess tax benefits realized from the vesting of restricted stock or stock option exercises are recognized as an income tax benefit in our consolidated statements of operations and are required to be reported as an operating cash inflow rather than a reduction of taxes paid. The excess tax benefits realized in 2017, 20162020, 2019 and 20152018 were $1$3 million, zero,$7 million, and $2$6 million, respectively.

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19.20.   Contingencies
Litigation
West Fertilizer Co.
On April 17, 2013, there was a fire and explosion at the West Fertilizer Co. fertilizer storage and distribution facility in West, Texas. According to published reports, 15 people were killed and approximately 200 people were injured in the incident, and the fire and explosion damaged or destroyed a number of homes and buildings around the facility. Various subsidiaries of CF Industries Holdings, Inc. (the CF Entities) have beenwere named as defendants along with other companies in lawsuits filed in 2013, 2014 and 2015 in the District Court of McLennan County, Texas by the City of West, individual residents of the County and other parties seeking recovery for damages allegedly sustained as a result of the explosion. The cases have beenwere consolidated for discovery and pretrial proceedings in the District Court of McLennan County under the caption "In“In re: West Explosion Cases." The two-year statute of limitations expired on April 17, 2015. As of that date, over 400 plaintiffs had filed claims, including at least 9 entities, 325 individuals, and 80 insurance companies. Plaintiffs allege various theories of negligence, strict liability, and breach of warranty under Texas law. Although we do not own or operate the facility or directly sell our products to West Fertilizer Co., products that the CF Entities have manufactured and sold to others have beenwere delivered to the facility and may have been stored at the West facility at the time of the incident.
The Court granted in part and denied in part the CF Entities'Entities’ Motions for Summary Judgment in August 2015. Over one hundred sixty300 cases have been resolved pursuant to confidential settlements that have been or we expect will be fully funded by insurance. The remaining cases are in various stages of discovery and pre-trial proceedings. The next trialgroup of cases is expected to be scheduledset for later in 2018.trial after the Court resumes scheduling civil jury trials currently on hold because of the coronavirus disease 2019 (COVID-19) pandemic. We believe we have strong legal and factual defenses and intend to continue defending the CF Entities vigorously in the pending lawsuits. The Company cannot provide a range of reasonably possible loss due to the lack of damages discovery for many of the remaining claims and the uncertain nature of this litigation, including uncertainties around the potential allocation of responsibility by a jury to other defendants or responsible third parties. The recognition of a potential loss in the future in the West Fertilizer Co. litigation could negatively affect our results in the period of recognition. However, based upon currently available information, including available insurance coverage, we do not believe that this litigation will have a material adverse effect on our consolidated financial position, results of operations or cash flows.
Other Litigation
From time to time, we are subject to ordinary, routine legal proceedings related to the usual conduct of our business, including proceedings regarding public utility and transportation rates, environmental matters, taxes and permits relating to the operations of our various plants and facilities. Based on the information available as of the date of this filing, we believe that the ultimate outcome of these routine matters will not have a material adverse effect on our consolidated financial position, results of operations or cash flows.
Environmental
Louisiana Environmental Matters
Clean Air Act—Ozone Nonattainment Designation
Our Donaldsonville nitrogen complex is located in a five-parish region near Baton Rouge, Louisiana. On December 15, 2016, the EPA redesignated the Baton Rouge Nonattainment Area as "attainment" with respect to the 2008 8-hour ozone national ambient air quality standard (NAAQS). However, based on 2013-2015 air quality monitoring data, the State of Louisiana recommended that the EPA designate the Baton Rouge area as "non-attainment" pursuant to the updated 2015 8-hour ozone standard. On December 20, 2017, the EPA notified the state of Louisiana that it intends to designate the Baton Rouge area as non-attainment for the 2015 ozone standard. On January 5, 2018, the EPA published notice of a public comment period with respect to the proposed attainment/non-attainment designations of certain air quality regions, including the Baton Rouge area. Designation of the Baton Rouge area as nonattainment with respect to the 2015 ozone standard could result in more stringent air pollution emissions limits for our existing operation and would subject our facilities to more stringent requirements to obtain approvals for plant expansions, or could make it difficult to obtain such approvals.
Florida Environmental Matters
On March 17, 2014, we completed the sale of our phosphate mining and manufacturing business, which was located in Florida, to Mosaic. Pursuant to the terms of the definitive agreement executed in October 2013, Mosaic assumed the following environmental matters and we agreed to indemnify Mosaic with respect to losses arising out of the matters below, subject to a maximum indemnification cap and the other terms of the definitive agreement.

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Clean Air Act Notice of Violation
We received a Notice of Violation (NOV) from the EPA by letter dated June 16, 2010, alleging that we violated the Prevention of Significant Deterioration (PSD) Clean Air Act regulations relating to certain projects undertaken at the former Plant City, Florida facility's sulfuric acid plants. This NOV further alleges that the actions that are the basis for the alleged PSD violations also resulted in violations of Title V air operating permit regulations. Finally, the NOV alleges that we failed to comply with certain compliance dates established by hazardous air pollutant regulations for phosphoric acid manufacturing plants and phosphate fertilizer production plants. We had several meetings with the EPA with respect to this matter prior to our sale of the phosphate mining and manufacturing business in March 2014. We and Mosaic have separately had continued discussions with the EPA subsequent to our sale of the phosphate mining and manufacturing business with respect to this matter. We do not know at this time if this matter will be settled prior to initiation of formal legal action.
We cannot estimate the potential penalties, fines or other expenditures, if any, that may result from the Clean Air Act NOV and, therefore, we cannot determine if the ultimate outcome of this matter will have a material impact on our consolidated financial position, results of operations or cash flows.
EPCRA/CERCLA Notice of Violation
By letter dated July 6, 2010, the EPA issued a NOV to us alleging violations of Section 313 of the Emergency Planning and Community Right-to-Know Act (EPCRA) in connection with the former Plant City facility. EPCRA requires annual reports to be submitted with respect to the use of certain toxic chemicals. The NOV also included an allegation that we violated Section 304 of EPCRA and Section 103 of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) by failing to file a timely notification relating to the release of hydrogen fluoride above applicable reportable quantities. We do not know at this time if this matter will be settled prior to initiation of formal legal action.
We do not expect that penalties or fines, if any, that may arise out of the EPCRA/CERCLA matter will have a material impact on our consolidated financial position, results of operations or cash flows.
Other
CERCLA/Remediation Matters
From time to time, we receive notices from governmental agencies or third parties alleging that we are a potentially responsible party at certain cleanup sites under CERCLA or other environmental cleanup laws. In 2011, we received a notice from the Idaho Department of Environmental Quality (IDEQ) that alleged that we were a potentially responsible party for the cleanup of a former phosphate mine site we owned in the late 1950s and early 1960s located in Georgetown Canyon, Idaho. The current owner of the property and a former mining contractor received similar notices for the site. In 2014, we and the current property owner entered into a Consent Order with IDEQ and the U.S. Forest Service to conduct a remedial investigation and feasibility study of the site. In 2015, we and several other parties received a notice that the U.S. Department of the Interior and other trustees intend to undertake a natural resource damage assessment for a group of17 former phosphate mines in southeast Idaho, includingone of which is the former Georgetown Canyon mine. WeBecause the former mine site is still in the remedial investigation/feasibility study stage, we are not able to estimate at this time our potential liability, if any, with respect to the cleanup of the site or a possible claim for natural resource damages. However, based on currently available information,the results of the site investigation conducted to date, we do not expect the remedial or financial obligations to which we may be subject involving this or other cleanup sites will have a material adverse effect on our consolidated financial position, results of operations or cash flows.

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20.21.    Segment Disclosures
Our reportable segments consist of ammonia, granular urea, UAN, AN, and Other. These segments are differentiated by products. Our management uses gross margin to evaluate segment performance and allocate resources. Total other operating costs and expenses (consisting of selling, general and administrative expenses and other operating—net) and non-operating expenses (interest and income taxes) are centrally managed and are not included in the measurement of segment profitability reviewed by management.
Our assets, with the exception of goodwill, are not monitored by or reported to our chief operating decision maker by segment; therefore, we do not present total assets by segment. Goodwill by segment is presented in Note 6—7—Goodwill and Other Intangible Assets.
Segment data for sales, cost of sales and gross margin for 2017, 20162020, 2019 and 20152018 are presented in the tablestable below.
 Ammonia
Granular Urea(1)
UAN(1)
AN(1)
Other(1)
Consolidated
 (in millions)
Year ended December 31, 2020  
Net sales$1,020 $1,248 $1,063 $455 $338 $4,124 
Cost of sales850 847 949 390 287 3,323 
Gross margin$170 $401 $114 $65 $51 801 
Total other operating costs and expenses189 
Equity in earnings of operating affiliate  11 
Operating earnings  $623 
Year ended December 31, 2019  
Net sales$1,113 $1,342 $1,270 $506 $359 $4,590 
Cost of sales878 861 981 399 297 3,416 
Gross margin$235 $481 $289 $107 $62 1,174 
Total other operating costs and expenses  166 
Equity in loss of operating affiliate  (5)
Operating earnings  $1,003 
Year ended December 31, 2018  
Net sales$1,028 $1,322 $1,234 $460 $385 $4,429 
Cost of sales867 889 1,007 414 335 3,512 
Gross margin$161 $433 $227 $46 $50 917 
Total other operating costs and expenses  187 
Equity in earnings of operating affiliate  36 
Operating earnings  $766 

(1)The cost of ammonia that is upgraded into other products is transferred at cost into the upgraded product results.

Depreciation and amortization by segment for 2020, 2019 and 2018 is as follows:
AmmoniaGranular UreaUANANOtherCorporateConsolidated
 (in millions)
Depreciation and amortization
Year ended December 31, 2020$176 $270 $256 $100 $68 $22 $892 
Year ended December 31, 2019167 264 251 88 72 33 875 
Year ended December 31, 2018155 276 270 85 67 35 888 
107
 Ammonia 
Granular Urea(1)
 
UAN(1)
 
AN(1)
 
Other(1)
 Consolidated
 (in millions)
Year ended December 31, 2017         
  
Net sales$1,209
 $971
 $1,134
 $497
 $319
 $4,130
Cost of sales1,071
 856
 1,055
 446
 272
 3,700
Gross margin$138
 $115
 $79
 $51
 $47
 430
Total other operating costs and expenses         
 210
Equity in earnings of operating affiliates         
 9
Operating earnings         
 $229
Year ended December 31, 2016         
  
Net sales$981
 $831
 $1,196
 $411
 $266
 $3,685
Cost of sales715
 584
 920
 409
 217
 2,845
Gross margin$266
 $247
 $276
 $2
 $49
 840
Total other operating costs and expenses         
 561
Equity in losses of operating affiliates         
 (145)
Operating earnings         
 $134
Year ended December 31, 2015         
  
Net sales$1,523
 $788
 $1,480
 $294
 $223
 $4,308
Cost of sales884
 469
 955
 291
 162
 2,761
Gross margin$639
 $319
 $525
 $3
 $61
 1,547
Total other operating costs and expenses         
 319
Equity in losses of operating affiliates         
 (35)
Operating earnings         
 $1,193

(1)
The cost of ammonia that is upgraded into other products is transferred at cost into the upgraded product results.

 Ammonia Granular Urea UAN AN Other Corporate Consolidated
 (in millions)
Depreciation and amortization     
    
    
Year ended December 31, 2017$183
 $246
 $265
 $85
 $57
 $47
 $883
Year ended December 31, 2016$96
 $112
 $247
 $93
 $46
 $84
 $678
Year ended December 31, 2015$95
 $51
 $192
 $66
 $35
 $41
 $480


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Enterprise-wide data by geographic region is as follows:
 Year ended December 31,
 202020192018
 (in millions)
Sales by geographic region (based on destination of shipments):  
United States$3,036 $3,387 $3,160 
Foreign:
Canada397 410 379 
North America, excluding U.S. and Canada54 53 81 
United Kingdom332 413 425 
Other foreign305 327 384 
Total foreign1,088 1,203 1,269 
Consolidated$4,124 $4,590 $4,429 
 Year ended December 31,
 2017 2016 2015
 (in millions)
Sales by geographic region (based on destination of shipments):   
  
United States$2,851
 $2,728
 $3,485
Foreign:     
Canada352
 349
 490
United Kingdom427
 394
 153
Other foreign500
 214
 180
Total foreign1,279
 957
 823
Consolidated$4,130
 $3,685
 $4,308

December 31, December 31,
2017 2016 2015 202020192018
(in millions) (in millions)
Property, plant and equipment—net by geographic region: 
  
  Property, plant and equipment—net by geographic region:  
United States$7,921
 $8,444
 $7,202
United States$6,527 $6,991 $7,426 
Foreign:     Foreign:
Canada551
 523
 497
Canada525 558 544 
United Kingdom703
 685
 840
United Kingdom580 621 653 
Total foreign1,254
 1,208
 1,337
Total foreign1,105 1,179 1,197 
Consolidated$9,175
 $9,652
 $8,539
Consolidated$7,632 $8,170 $8,623 
Our principal customers are cooperatives, independent fertilizer distributors, traders, wholesalers and industrial users. In 20172020, 2019 and 2016,2018, CHS accounted for approximately 11%13%, 15% and 12%14% of our consolidated net sales, respectively. See Note 16—17—Noncontrolling Interests for additional information. None of our other customers accounted for more than ten percent of our consolidated sales in 2015.
21.22.   Supplemental Cash Flow Information
The following provides additional information relating to cash flow activities:
 Year ended December 31,
 202020192018
 (in millions)
Cash paid during the year for   
Interest—net of interest capitalized$184 $228 $227 
Income taxes—net of refunds111 (41)
Supplemental disclosure of noncash investing and financing activities:
Change in capitalized expenditures in accounts payable and accrued expenses$$(6)$
Change in accrued share repurchases(33)33 
108
 Year ended December 31,
 2017 2016 2015
 (in millions)
Cash paid during the year for 
  
  
Interest—net of interest capitalized$311
 $144
 $100
Income taxes—net of refunds(807) (110) 435
      
Supplemental disclosure of noncash investing and financing activities:     
Change in capitalized expenditures in accounts payable and accrued expenses(179) (263) 258
Change in capitalized expenditures in other liabilities
 (55) 6
Change in noncontrolling interests in other liabilities
 8
 
Change in accrued share repurchases
 
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22.23.   Asset Retirement Obligations
Asset retirement obligations (AROs) are legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development or normal operation of such assets. AROs are initially recognized as incurred when sufficient information exists to estimate fair value. We have AROs at our nitrogen fertilizer manufacturing complexes and at our distribution and storage facilities that are conditional upon cessation of operations. These AROs include certain decommissioning activities as well as the removal and disposal of certain chemicals, waste materials, structures, equipment, vessels, piping and storage tanks. Also included are reclamation of land and the closure of certain effluent ponds.ponds and/or waste storage areas. The most recent estimate of the aggregate cost of these AROs expressed in 20172020 dollars is $73approximately $115 million. We have not recorded a liability for these conditional AROs as of December 31, 20172020 because we do not believe there is currently a reasonable basis for estimating a date or range of dates of cessation of operations at our nitrogen fertilizer manufacturing facilities or our distribution and storage facilities, which is necessary in order to estimate fair value. In reaching this conclusion, we considered the historical performance of each complex or facility and have taken into account factors such as planned maintenance, asset replacements and upgrades of plant and equipment, which if conducted as in the past, can extend the physical lives of our nitrogen manufacturing facilities and our distribution and storage facilities indefinitely. We also considered the possibility of changes in technology, risk of obsolescence, and availability of raw materials in arriving at our conclusion.
23.24.   Leases
We have operating leases for certain property and equipment under various noncancelable agreements, the most significant of which are rail car leases and barge tow charters for the distribution of our products. The rail car leases currently have minimum terms ranging from one to eleven years and the barge tow charter commitments range from approximately one to sevensix years. Our rail car leases and barge tow charters commonly contain provisions for automatic renewal that can extend the lease term unless canceled by either party. We also have operating leases for terminal and warehouse storage agreements for our distribution system, some of which contain minimum throughput requirements. The storage agreements contain minimum terms generally ranging from one to five years and commonly contain provisions for automatic annual renewal provisions thereafter unless canceled by either party. The renewal provisions for our rail car leases, barge tow charters and terminal and warehouse storage agreements are not reasonably certain to be exercised.
Future minimum payments under noncancelable operating leases with initial or remaining noncancelableThe components of lease terms in excess of one yearcosts were as of December 31, 2017 are shown below.follows:
 
Operating
Lease Payments
 (in millions)
2018$83
201977
202057
202147
202236
Thereafter76
 $376
Year ended December 31,
 20202019
 (in millions)
Operating lease cost$107 $95 
Short-term lease cost17 26 
Variable lease cost
Total lease cost$130 $125 
Total rent expense for cancelable and noncancelable operating leases was $125$121 million for 2017, $111 million for 2016 and $100 million for 2015.2018, which was recorded under the previous lease accounting standard, ASC 840.

Supplemental cash flow information related to leases was as follows:
Year ended December 31,
 20202019
 (in millions)
Operating cash flows - cash paid for amounts included in the measurement of operating lease liabilities$105 $93 
Right-of-use (ROU) assets obtained in exchange for operating lease obligations80 73 
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Supplemental balance sheet information related to leases was as follows:
24.   Quarterly Data—Unaudited
December 31,
 20202019
 (in millions)
Operating lease ROU assets$259 $280 
Current operating lease liabilities$88 $90 
Operating lease liabilities174 193 
Total operating lease liabilities$262 $283 
December 31,
 20202019
Operating leases
Weighted-average remaining lease term4 years5 years
Weighted-average discount rate(1)
4.7 %4.9 %

(1)Upon adoption of the new lease accounting standard, discount rates used for existing leases were established at January 1, 2019.
The following tables presenttable reconciles the unaudited quarterly resultsundiscounted cash flows for our operating leases to the operating lease liabilities recorded on our consolidated balance sheet as of operations for the eight quarters ended December 31, 2017. This quarterly information has2020.
 Operating
lease payments
 (in millions)
2021$90 
202268 
202347 
202439 
202522 
Thereafter24 
Total lease payments290 
Less: imputed interest(28)
Present value of lease liabilities262 
Less: Current operating lease liabilities(88)
Operating lease liabilities$174 
As of December 31, 2020, we have entered into additional leases that had not yet commenced and therefore have been prepared on the same basisexcluded from total operating lease liabilities as the consolidated financial statementsof that date. These leases will commence in fiscal year 2021 with future minimum payments of $6 million and in the opinionlease terms of management, reflects all adjustments necessary for the fair representation of the information for the periods presented. This data should be read in conjunction with the audited consolidated financial statements and related disclosures. Operating results for any quarter apply to that quarter only and are not necessarily indicative of results for any future period.five years.
 Three months ended,  
 March 31 June 30 September 30 December 31 Full Year
 (in millions, except per share amounts)
2017 
  
  
  
  
Net sales$1,037
 $1,124
 $870
 $1,099
 $4,130
Gross margin106
 172
 9
 143
 430
Unrealized (losses) gains on natural gas derivatives(1)
(53) (18) 7
 3
 (61)
Net (loss) earnings attributable to common stockholders(2)
(23) 3
 (87) 465
 358
Net (loss) earnings per share attributable to common stockholders(2)
 
  
  
  
  
Basic(3)
(0.10) 0.01
 (0.37) 1.99
 1.53
Diluted(3)
(0.10) 0.01
 (0.37) 1.98
 1.53
2016 
  
  
  
  
Net sales$1,004
 $1,134
 $680
 $867
 $3,685
Gross margin217
 527
 2
 94
 840
Unrealized (losses) gains on natural gas derivatives(1)
(21) 211
 (21) 91
 260
Net earnings (loss) attributable to common stockholders(4)
26
 47
 (30) (320) (277)
Net earnings (loss) per share attributable to common stockholders(4)
 
  
  
  
  
Basic(3)
0.11
 0.20
 (0.13) (1.38) (1.19)
Diluted(3)
0.11
 0.20
 (0.13) (1.38) (1.19)

(1)
Amounts represent pre-tax unrealized (losses) gains on natural gas derivatives, which are included in gross margin. See Note 14—Derivative Financial Instruments for additional information.
(2)
For the three months ended December 31, 2017, net earnings attributable to common stockholders includes the Tax Reform impact of $491 million that is included in income tax benefit, and net earnings per share attributable to common stockholders, basic and diluted, include the per share impact of $2.09. See Note 9—Income Taxes for additional information.
(3)
The sum of the four quarters is not necessarily the same as the total for the year.
(4)
For the three months ended September 30, 2016, net loss attributable to common stockholders includes an after-tax loss of $14 million (pre-tax loss of $22 million) resulting from recognizing the value of an embedded derivative liability to reflect our credit evaluation that is included in other operating—net, and net loss per share attributable to common stockholders, basic and diluted, include the per share impact of $0.06. See Note 8—Fair Value Measurements and Note 16—Noncontrolling Interests for additional information.
For the three months ended December 31, 2016, net loss attributable to common stockholders includes an after-tax impairment charge of $134 million on our equity method investment in PLNL that is included in equity in (loss) earnings of operating affiliates, and net loss per share attributable to common stockholders, basic and diluted, include the per share impact of $0.57. See Note 7—Equity Method Investments and Note 8—Fair Value Measurements for additional information.

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25.   Condensed Consolidating Financial StatementsSubsequent Events
The following condensed consolidating financial information is presentedOn February 17, 2021, we announced that our wholly owned subsidiary CF Industries, Inc. elected to redeem in full the entire outstanding $250 million principal amount of the 2021 Notes on March 20, 2021, in accordance with SEC Regulation S-X Rule 3-10, Financial statements of guarantors and issuers of guaranteed securities registered or being registered, and relates to (i) the senior notes due 2018, 2020, 2023, 2034, 2043 and 2044 (described in Note 11—Financing Agreements and referred to in this report as the Public Senior Notes) issued by CF Industries, Inc. (CF Industries), a 100% owned subsidiary of CF Industries Holdings, Inc. (Parent), and guarantees of the Public Senior Notes by Parent and by CFE and CFS (the Subsidiary Guarantors), which are 100% owned subsidiaries of Parent, and (ii) debt securities of CF Industries (Other Debt Securities), and guarantees thereof by Parent and the Subsidiary Guarantors, that may be offered and sold from time to time under registration statements that may be filed by Parent, CF Industries and the Subsidiary Guarantors with the SEC.
In the event that a subsidiary of Parent, other than CF Industries, becomes a borrower or a guarantor under the Revolving Credit Agreement (or any renewal, replacement or refinancing thereof), such subsidiary would be required to become a guarantor of the Public Senior Notes,optional redemption provisions provided that such requirement will no longer apply with respect to the Public Senior Notes due 2023, 2034, 2043 and 2044 following the repayment of the Public Senior Notes due 2018 and 2020 or the subsidiaries of Parent, other than CF Industries, otherwise becoming no longer subject to such a requirement to guarantee the Public Senior Notes due 2018 and 2020. CFE and CFS became guarantors of the Public Senior Notes as a result of this requirement on November 21, 2016.
All of the guarantees of the Public Senior Notes are, and we have assumed for purposes of this presentation of condensed consolidating financial information that the guarantees of any Other Debt Securities would be, full and unconditional (as such term is defined in SEC Regulation S-X Rule 3-10(h)) and joint and several. The guarantee of a Subsidiary Guarantor will be automatically released with respect to a series of the Public Senior Notes (1) upon the release, discharge or termination of such Subsidiary Guarantor’s guarantee of the Revolving Credit Agreement (or any renewal, replacement or refinancing thereof), (2) upon legal defeasance with respect to the Public Senior Notes of such series or satisfaction and discharge of the indenture with respect to such series of Public Senior Notes or (3) in the case of the Public Senior Notes due 2023, 2034, 2043 and 2044, upon the later to occur of (a) the discharge, termination or release of, or the release of such Subsidiary Guarantor from its obligations under, such Subsidiary Guarantor’s guarantee of the Public Senior Notes due 2018, including, without limitation, any such discharge, termination or release as a result of retirement, discharge or legal or covenant defeasance of, or satisfaction and discharge of the supplemental indenture governing the Public Senior Notes due 2018, and (b)2021 Notes. Based on market interest rates on February 12, 2021, we estimate that the discharge, termination or release of, ortotal amount for the release of such Subsidiary Guarantor from its obligations under, such Subsidiary Guarantor’s guaranteeredemption of the Public Senior2021 Notes due 2020,will be approximately $258 million, including without limitation, any such discharge, termination or release as a result of retirement, discharge or legal or covenant defeasance of, or satisfaction and dischargeaccrued interest. See Note 12—Financing Agreements for additional information.
In February 2021, the central portion of the supplemental indenture governing,United States experienced extreme and unprecedented cold weather. Certain natural gas suppliers declared force majeure events due to natural gas well freeze offs or frozen equipment. This occurred at the Public Senior Notessame time as large increases in natural gas demand were occurring due 2020.
For purposesto the cold temperatures. Due to these unprecedented factors, several states declared a state of the presentationemergency and natural gas was redirected for residential usage. At certain of condensed consolidating financial information, the subsidiariesour manufacturing locations, we were asked to reduce our natural gas consumption and therefore these plants either operated at reduced rates or temporarily suspended operations. We returned excess natural gas to our suppliers and received prevailing market prices, which were in excess of Parent other than CF Industries, CFEour cost. During this period of time, we have experienced lower production, but have procured product in order to meet customer obligations. Higher maintenance and CFS are referred torepair activity may be necessary as the Non-Guarantors.
Presented belowplants are condensed consolidating statements of operations and statements of cash flows for Parent, CF Industries,restarted. At the Subsidiary Guarantors and the Non-Guarantors for the years ended December 31, 2017, 2016 and 2015 and condensed consolidating balance sheets for Parent, CF Industries, the Subsidiary Guarantors and the Non-Guarantors as of December 31, 2017 and 2016. The condensed consolidating financial information presented below is not necessarily indicative of the financial position, results of operations, comprehensive income (loss) or cash flows of Parent, CF Industries, the Subsidiary Guarantors or the Non-Guarantors on a stand-alone basis.
In these condensed consolidating financial statements, investments in subsidiaries are presented under the equity method, in which our investments are recorded at cost and adjusted for our ownership share of a subsidiary's cumulative results of operations, distributions and other equity changes, and the eliminating entries reflect primarily intercompany transactions such as sales, accounts receivable and accounts payable and the elimination of equity investments and earnings of subsidiaries. Two of our consolidated entities have made elections to be taxed as partnerships for U.S. federal income tax purposes and are included in the non-guarantor column. Due to the partnership tax treatment, these subsidiariespresent time, we do not record taxes on their financial statements. The tax provision pertaining toknow the incomenet positive or negative impact of these partnerships, plus applicable deferred tax balances are reflectedevents on the financial statements of the parent company owner that is includedour operations; however, we do not expect it to result in the subsidiary guarantors column in the following financial information. Liabilities relateda material impact to benefit plan obligations are reflected on the legal entity that funds the obligation, while the benefit plan expense is included on the legal entity to which the employee provides services.our business.


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In 2017, CF Holdings and its U.S. domestic subsidiaries entered into a Tax Matters Agreement (the "Agreement") that provides for the allocation of and reimbursement for the payment of U.S. federal and state income tax liabilities among corporations included in the consolidated U.S. federal income tax returns (the "Consolidated Group Members"). The Agreement relates to tax years commencing with the tax year ending December 31, 2010. The financial statements for the year ended December 31, 2017 reflect the impact on the income tax (benefit) provision and intercompany accounts resulting from the allocation of federal income tax liabilities among Consolidated Group Members for tax years through December 31, 2016.

Condensed Consolidating Statement of Operations
 Year ended December 31, 2017
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Net sales$
 $442
 $3,257
 $3,380
 $(2,949) $4,130
Cost of sales
 278
 3,386
 2,985
 (2,949) 3,700
Gross margin
 164
 (129) 395
 
 430
Selling, general and administrative expenses4
 (4) 113
 79
 
 192
Other operating—net
 2
 3
 13
 
 18
Total other operating costs and expenses4
 (2) 116
 92
 
 210
Equity in (loss) earnings of operating affiliates
 (3) 
 12
 
 9
Operating (loss) earnings(4) 163
 (245) 315
 
 229
Interest expense
 318
 37
 5
 (45) 315
Interest income
 (33) (11) (13) 45
 (12)
Loss on debt extinguishment
 53
 
 
 
 53
Net loss (earnings) of wholly owned subsidiaries361
 1,091
 (204) 
 (1,248) 
Other non-operating—net
 
 (1) (1) 
 (2)
(Loss) earnings before income taxes(365) (1,266) (66) 324
 1,248
 (125)
Income tax (benefit) provision(723) (905) 1,037
 16
 
 (575)
Net earnings (loss)358
 (361) (1,103) 308
 1,248
 450
Less: Net earnings attributable to noncontrolling interests
 
 
 92
 
 92
Net earnings (loss) attributable to common stockholders$358
 $(361) $(1,103) $216
 $1,248
 $358

Condensed Consolidating Statement of Comprehensive Income (Loss)
 Year ended December 31, 2017
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Net earnings (loss)$358
 $(361) $(1,103) $308
 $1,248
 $450
Other comprehensive income135
 135
 91
 130
 (356) 135
Comprehensive income (loss)493
 (226) (1,012) 438
 892
 585
Less: Comprehensive income attributable to noncontrolling interests
 
 
 92
 
 92
Comprehensive income (loss) attributable to common stockholders$493
 $(226) $(1,012) $346
 $892
 $493

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CF INDUSTRIES HOLDINGS, INC.




Condensed Consolidating Statement of Operations
 Year ended December 31, 2016
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Net sales$
 $362
 $2,932
 $2,939
 $(2,548) $3,685
Cost of sales
 207
 2,806
 2,380
 (2,548) 2,845
Gross margin
 155
 126
 559
 
 840
Selling, general and administrative expenses4
 9
 105
 56
 
 174
Transaction costs(46) 
 223
 2
 
 179
Other operating—net
 7
 30
 171
 
 208
Total other operating costs and expenses(42) 16
 358
 229
 
 561
Equity in loss of operating affiliates
 
 
 (145) 
 (145)
Operating earnings (losses)42
 139
 (232) 185
 
 134
Interest expense
 347
 85
 (155) (77) 200
Interest income
 (49) (8) (25) 77
 (5)
Loss on debt extinguishment
 167
 
 
 
 167
Net loss (earnings) of wholly owned subsidiaries304
 92
 (315) 
 (81) 
Other non-operating—net
 
 
 (2) 
 (2)
(Loss) earnings before income taxes(262) (418) 6
 367
 81
 (226)
Income tax provision (benefit)15
 (114) 18
 13
 
 (68)
Net (loss) earnings(277) (304) (12) 354
 81
 (158)
Less: Net earnings attributable to noncontrolling interest
 
 
 119
 
 119
Net (loss) earnings attributable to common stockholders$(277) $(304) $(12) $235
 $81
 $(277)

Condensed Consolidating Statement of Comprehensive (Loss) Income
 Year ended December 31, 2016
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Net (loss) earnings$(277) $(304) $(12) $354
 $81
 $(158)
Other comprehensive loss(148) (148) (68) (134) 350
 (148)
Comprehensive (loss) income(425) (452) (80) 220
 431
 (306)
Less: Comprehensive income attributable to noncontrolling interest
 
 
 119
 
 119
Comprehensive (loss) income attributable to common stockholders$(425) $(452) $(80) $101
 $431
 $(425)


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CF INDUSTRIES HOLDINGS, INC.




Condensed Consolidating Statement of Operations
 Year ended December 31, 2015
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Net sales$
 $462
 $4,101
 $2,464
 $(2,719) $4,308
Cost of sales
 361
 3,186
 1,933
 (2,719) 2,761
Gross margin
 101
 915
 531
 
 1,547
Selling, general and administrative expenses4
 8
 120
 38
 
 170
Transaction costs46
 
 7
 4
 
 57
Other operating—net
 (8) 29
 71
 
 92
Total other operating costs and expenses50
 
 156
 113
 
 319
Equity in loss of operating affiliates
 
 
 (35) 
 (35)
Operating (loss) earnings(50) 101
 759
 383
 
 1,193
Interest expense
 285
 14
 (70) (96) 133
Interest income
 (69) (25) (4) 96
 (2)
Net earnings of wholly owned subsidiaries(731) (802) (403) 
 1,936
 
Other non-operating—net
 
 5
 (1) 
 4
Earnings before income taxes and equity in earnings of non-operating affiliates681
 687
 1,168
 458
 (1,936) 1,058
Income tax (benefit) provision(19) (44) 385
 74
 
 396
Equity in earnings of non-operating affiliates—net of taxes
 
 10
 62
 
 72
Net earnings700
 731
 793
 446
 (1,936) 734
Less: Net earnings attributable to noncontrolling interest
 
 
 34
 
 34
Net earnings attributable to common stockholders$700
 $731
 $793
 $412
 $(1,936) $700

Condensed Consolidating Statement of Comprehensive Income
 Year ended December 31, 2015
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Net earnings$700
 $731
 $793
 $446
 $(1,936) $734
Other comprehensive loss(90) (90) (98) (96) 284
 (90)
Comprehensive income610
 641
 695
 350
 (1,652) 644
Less: Comprehensive income attributable to noncontrolling interest
 
 
 34
 
 34
Comprehensive income attributable to common stockholders$610
 $641
 $695
 $316
 $(1,652) $610









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CF INDUSTRIES HOLDINGS, INC.




Condensed Consolidating Balance Sheet
 December 31, 2017
 Parent CF Industries Subsidiary Guarantors Non- Guarantors 
Eliminations
and
Reclassifications
 Consolidated
 (in millions)
Assets 
  
    
  
  
Current assets: 
  
    
  
  
Cash and cash equivalents$
 $15
 $388
 $432
 $
 $835
Accounts and notes receivable—net743
 1,553
 2,670
 768
 (5,427) 307
Inventories
 4
 104
 167
 
 275
Prepaid income taxes
 
 33
 
 
 33
Other current assets
 
 10
 5
 
 15
Total current assets743
 1,572
 3,205
 1,372
 (5,427) 1,465
Property, plant and equipment—net
 
 123
 9,052
 
 9,175
Deferred income taxes
 8
 
 
 (8) 
Investments in affiliates4,055
 8,411
 6,490
 108
 (18,956) 108
Goodwill
 
 2,063
 308
 
 2,371
Other assets
 85
 82
 453
 (276) 344
Total assets$4,798
 $10,076
 $11,963
 $11,293
 $(24,667) $13,463
Liabilities and Equity 
  
  
  
  
  
Current liabilities: 
  
  
  
  
  
Accounts and notes payable and accrued expenses$1,219
 $1,314
 $2,658
 $708
 $(5,427) $472
Income taxes payable
 
 
 2
 
 2
Customer advances
 
 89
 
 
 89
Other current liabilities
 
 14
 3
 
 17
Total current liabilities1,219
 1,314
 2,761
 713
 (5,427) 580
Long-term debt
 4,692
 198
 78
 (276) 4,692
Deferred income taxes
 
 876
 179
 (8) 1,047
Other liabilities
 16
 243
 201
 
 460
Equity: 
  
  
  
  
  
Stockholders' equity: 
  
  
  
  
  
Preferred stock
 
 
 
 
 
Common stock2
 
 
 4,738
 (4,738) 2
Paid-in capital1,397
 1,854
 9,505
 1,783
 (13,142) 1,397
Retained earnings2,443
 2,463
 (1,432) 709
 (1,740) 2,443
Treasury stock
 
 
 
 
 
Accumulated other comprehensive loss(263) (263) (180) (221) 664
 (263)
Total stockholders' equity3,579
 4,054
 7,893
 7,009
 (18,956) 3,579
Noncontrolling interests
 
 (8) 3,113
 
 3,105
Total equity3,579
 4,054
 7,885
 10,122
 (18,956) 6,684
Total liabilities and equity$4,798
 $10,076
 $11,963
 $11,293
 $(24,667) $13,463

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CF INDUSTRIES HOLDINGS, INC.




Condensed Consolidating Balance Sheet
 December 31, 2016
 Parent CF Industries Subsidiary Guarantors Non- Guarantors 
Eliminations
and
Reclassifications
 Consolidated
 (in millions)
Assets 
  
    
  
  
Current assets: 
  
    
  
  
Cash and cash equivalents$
 $36
 $878
 $250
 $
 $1,164
Restricted cash
 
 
 5
 
 5
Accounts and notes receivable—net20
 1,259
 1,418
 495
 (2,956) 236
Inventories
 
 164
 175
 
 339
Prepaid income taxes
 
 839
 2
 
 841
Other current assets
 
 59
 11
 
 70
Total current assets20
 1,295
 3,358
 938
 (2,956) 2,655
Property, plant and equipment—net
 
 131
 9,521
 
 9,652
Investments in affiliates3,711
 9,370
 6,019
 139
 (19,100) 139
Due from affiliates571
 
 
 
 (571) 
Goodwill
 
 2,064
 281
 
 2,345
Other assets
 85
 101
 385
 (231) 340
Total assets$4,302
 $10,750
 $11,673
 $11,264
 $(22,858) $15,131
Liabilities and Equity 
  
  
  
  
  
Current liabilities: 
  
  
  
  
  
Accounts and notes payable and accrued expenses$954
 $418
 $1,505
 $717
 $(2,956) $638
Income taxes payable
 
 
 1
 
 1
Customer advances
 
 42
 
 
 42
Other current liabilities
 
 5
 
 
 5
Total current liabilities954
 418
 1,552
 718
 (2,956) 686
Long-term debt
 5,903
 39
 67
 (231) 5,778
Deferred income taxes
 90
 1,374
 166
 
 1,630
Due to affiliates
 571
 
 
 (571) 
Other liabilities
 59
 270
 216
 
 545
Equity: 
  
  
  
  
  
Stockholders' equity: 
  
   

 

  
Preferred stock
 
 
 
 
 
Common stock2
 
 
 4,383
 (4,383) 2
Paid-in capital1,380
 (13) 9,045
 2,246
 (11,278) 1,380
Retained earnings2,365
 4,120
 (329) 668
 (4,459) 2,365
Treasury stock(1) 
 
 
 
 (1)
Accumulated other comprehensive loss(398) (398) (271) (351) 1,020
 (398)
Total stockholders' equity3,348
 3,709
 8,445
 6,946
 (19,100) 3,348
Noncontrolling interests
 
 (7) 3,151
 
 3,144
Total equity3,348
 3,709
 8,438
 10,097
 (19,100) 6,492
Total liabilities and equity$4,302
 $10,750
 $11,673
 $11,264
 $(22,858) $15,131







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CF INDUSTRIES HOLDINGS, INC.




Condensed Consolidating Statement of Cash Flows
 Year ended December 31, 2017
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Operating Activities: 
  
    
  
  
Net earnings (loss)$358
 $(361) $(1,103) $308
 $1,248
 $450
Adjustments to reconcile net earnings (loss) to net cash (used in) provided by operating activities: 
  
  
  
  
  
Depreciation and amortization
 13
 22
 848
 
 883
Deferred income taxes
 
 (599) (2) 
 (601)
Stock-based compensation expense17
 
 
 
 
 17
Unrealized net loss on natural gas derivatives
 
 51
 10
 
 61
Loss on embedded derivative
 
 4
 
 
 4
Gain on sale of equity method investment
 
 
 (14) 
 (14)
Loss on debt extinguishment
 53
 
 
 
 53
Loss on disposal of property, plant and equipment
 
 
 3
 
 3
Undistributed losses (earnings) of affiliates—net361
 1,091
 (204) 3
 (1,248) 3
Changes in: 
  
  
  
  
  
Intercompany accounts receivable/accounts payable—net(736) (1,297) 1,527
 506
 
 
Accounts receivable—net
 
 (51) (6) 
 (57)
Inventories
 (4) 60
 (16) 
 40
Accrued and prepaid income taxes(1) (60) 1,217
 (347) 
 809
Accounts and notes payable and accrued expenses
 228
 27
 (256) 
 (1)
Customer advances
 
 48
 
 
 48
Other—net
 (5) (32) (30) 
 (67)
Net cash (used in) provided by operating activities(1) (342) 967
 1,007
 
 1,631
Investing Activities: 
  
  
  
  
  
Additions to property, plant and equipment
 
 (12) (461) 
 (473)
Proceeds from sale of property, plant and equipment
 
 
 20
 
 20
Proceeds from sale of equity method investment
 
 
 16
 
 16
Distributions received from unconsolidated affiliates
 
 179
 (165) 
 14
Proceeds from sale of auction rate securities
 9
 
 
 
 9
Withdrawals from restricted cash funds
 
 
 5
 
 5
Other—net
 
 
 1
 
 1
Net cash provided by (used in) investing activities
 9
 167
 (584) 
 (408)
Financing Activities: 
  
  
  
  
  
Long-term debt—net
 (125) 150
 (25) 
 
Payments of long-term borrowings
 (1,148) 
 
 
 (1,148)
Short-term debt—net280
 1,584
 (1,870) 6
 
 
Payment to CHS related to credit provision
 
 (5) 
 
 (5)
Financing fees
 (1) 
 
 
 (1)
Dividends paid on common stock(280) 
 
 (103) 103
 (280)
Distributions to noncontrolling interests
 
 
 (131) 
 (131)
Issuances of common stock under employee stock plans1
 
 
 
 
 1
Dividends to/from affiliates
 2
 101
 
 (103) 
Net cash provided by (used in) financing activities1
 312
 (1,624) (253) 
 (1,564)
Effect of exchange rate changes on cash and cash equivalents
 
 
 12
 
 12
(Decrease) increase in cash and cash equivalents
 (21) (490) 182
 
 (329)
Cash and cash equivalents at beginning of period
 36
 878
 250
 
 1,164
Cash and cash equivalents at end of period$
 $15
 $388
 $432
 $
 $835


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CF INDUSTRIES HOLDINGS, INC.




Condensed Consolidating Statement of Cash Flows
 Year ended December 31, 2016
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Operating Activities: 
  
    
  
  
Net (loss) earnings$(277) $(304) $(12) $354
 $81
 $(158)
Adjustments to reconcile net (loss) earnings to net cash provided by (used in) operating activities: 
  
  
  
  
  
Depreciation and amortization
 21
 55
 602
 
 678
Deferred income taxes
 
 740
 (1) 
 739
Stock-based compensation expense18
 
 
 1
 
 19
Unrealized net gain on natural gas derivatives
 
 (225) (35) 
 (260)
Loss on embedded derivative
 
 23
 
 
 23
Impairment of equity method investment in PLNL
 
 
 134
 
 134
Loss on debt extinguishment
 167
 
 
 
 167
Loss on disposal of property, plant and equipment
 
 2
 8
 
 10
Undistributed losses (earnings) of affiliates—net304
 92
 (315) 9
 (81) 9
Changes in:  

  
 

 

 

Intercompany accounts receivable/accounts payable—net(4) (10) 308
 (294) 
 
Accounts receivable—net
 44
 (11) (15) 
 18
Inventories
 
 (8) 1
 
 (7)
Accrued and prepaid income taxes
 
 (682) 6
 
 (676)
Accounts and notes payable and accrued expenses(8) (63) (12) 65
 
 (18)
Customer advances
 
 (120) 
 
 (120)
Other—net
 (6) (17) 82
 
 59
Net cash provided by (used in) operating activities33
 (59) (274) 917
 
 617
Investing Activities: 
  
  
  
  
  
Additions to property, plant and equipment
 
 (25) (2,186) 
 (2,211)
Proceeds from sale of property, plant and equipment
 
 4
 10
 
 14
Withdrawals from restricted cash funds
 
 
 18
 
 18
Investments in unconsolidated affiliates
 (44) (649) 
 693
 
Other—net
 6
 
 (4) 
 2
Net cash used in investing activities
 (38) (670) (2,162) 693
 (2,177)
Financing Activities: 
  
  
  
  
  
Long-term debt—net
 125
 
 (125) 
 
Proceeds from long-term borrowings
 1,244
 
 
 
 1,244
Payments of long-term borrowings
 (1,170) 
 
 
 (1,170)
Short-term debt—net106
 (40) (371) 305
 
 
Proceeds from short-term borrowings
 150
 
 
 
 150
Payments on short-term borrowings
 (150) 
 
 
 (150)
Payment to CHS related to credit provision
 
 (5) 
 
 (5)
Financing fees
 (31) 
 
 
 (31)
Dividends paid on common stock(280) (140) (140) (222) 502
 (280)
Issuance of noncontrolling interest in CFN
 
 
 2,800
 
 2,800
Distributions to noncontrolling interest
 
 
 (119) 
 (119)
Distribution received for CHS strategic venture
 
 2,000
 (2,000) 
 
Dividends to/from affiliates140
 145
 217
 
 (502) 
Other—net
 
 
 693
 (693) 
Net cash (used in) provided by financing activities(34) 133
 1,701
 1,332
 (693) 2,439
Effect of exchange rate changes on cash and cash equivalents
 
 
 (1) 
 (1)
(Decrease) increase in cash and cash equivalents(1) 36
 757
 86
 
 878
Cash and cash equivalents at beginning of period1
 
 121
 164
 
 286
Cash and cash equivalents at end of period$
 $36
 $878
 $250
 $
 $1,164

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CF INDUSTRIES HOLDINGS, INC.




Condensed Consolidating Statement of Cash Flows
 Year ended December 31, 2015
 Parent CF Industries Subsidiary Guarantors Non- Guarantors Eliminations Consolidated
 (in millions)
Operating Activities: 
  
    
  
  
Net earnings$700
 $731
 $793
 $446
 $(1,936) $734
Adjustments to reconcile net earnings to net cash (used in) provided by operating activities: 
  
  
  
  
  
Depreciation and amortization
 14
 19
 447
 
 480
Deferred income taxes
 17
 75
 (14) 
 78
Stock-based compensation expense16
 
 
 1
 
 17
Unrealized net loss on natural gas and foreign currency derivatives
 
 139
 24
 
 163
Gain on remeasurement of CF Fertilisers UK investment
 
 
 (94) 
 (94)
Impairment of equity method investment in PLNL
 
 
 62
 
 62
Loss on sale of equity method investments
 
 
 43
 
 43
Loss on disposal of property, plant and equipment
 
 
 21
 
 21
Undistributed earnings of affiliates—net(732) (802) (402) (3) 1,936
 (3)
Due to / from affiliates—net2
 1
 (135) 132
 
 
Changes in: 
  
  
  
  
  
Intercompany accounts receivable/accounts payable—net(1) (104) 96
 9
 
 
Accounts receivable—net
 (45) 50
 (9) 
 (4)
Inventories
 
 (38) (33) 
 (71)
Accrued and prepaid income taxes2
 (11) (105) (34) 
 (148)
Accounts and notes payable and accrued expenses9
 61
 14
 (42) 
 42
Customer advances
 
 (164) 
 
 (164)
Other—net
 31
 54
 (34) 
 51
Net cash (used in) provided by operating activities(4) (107) 396
 922
 
 1,207
Investing Activities: 
  
  
  
  
  
Additions to property, plant and equipment
 
 (26) (2,443) 
 (2,469)
Proceeds from sale of property, plant and equipment
 
 
 12
 
 12
Proceeds from sale of equity method investment
 
 
 13
 
 13
Purchase of CF Fertilisers UK, net of cash acquired
 
 
 (552) 
 (552)
Withdrawals from restricted cash funds
 
 
 63
 
 63
Other—net
 (82) (44) 1
 82
 (43)
Net cash used in investing activities
 (82) (70) (2,906) 82
 (2,976)
Financing Activities: 
  
  
  
  
  
Proceeds from long-term borrowings
 1,000
 
 
 
 1,000
Short-term debt—net554
 (870) (1,431) 1,747
 
 
Financing fees
 (47) 
 
 
 (47)
Dividends paid on common stock(282) (282) (282) (268) 832
 (282)
Dividends to/from affiliates282
 282
 268
 
 (832) 
Distributions to noncontrolling interest
 
 
 (45) 
 (45)
Purchases of treasury stock(556) 
 
 
 
 (556)
Shares withheld for taxes(1) 
 
 
 
 (1)
Issuances of common stock under employee stock plans8
 
 
 
 
 8
Other—net
 
 
 82
 (82) 
Net cash provided by (used in) by financing activities5
 83
 (1,445) 1,516
 (82) 77
Effect of exchange rate changes on cash and cash equivalents
 
 
 (19) 
 (19)
Increase (decrease) in cash and cash equivalents1
 (106) (1,119) (487) 
 (1,711)
Cash and cash equivalents at beginning of period
 106
 1,240
 651
 
 1,997
Cash and cash equivalents at end of period$1
 $
 $121
 $164
 $
 $286

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26.   Subsequent Event
On February 7, 2018, we announced that TNGP, the sole general partner of TNCLP and an indirect wholly owned subsidiary of CF Holdings, elected to exercise its right to purchase all of the 4,612,562 publicly traded common units of TNCLP on April 2, 2018, for a cash purchase price of $84.033 per unit in accordance with the terms of TNCLP’s partnership agreement. The purchase price of $84.033 per unit was determined under the terms of TNCLP’s partnership agreement as the average of the daily closing prices per common unit for the 20 consecutive trading days beginning with January 5, 2018 and ending with February 2, 2018. The purchase price of all of the 4,612,562 publicly traded common units of TNCLP is approximately $390 million. We intend to fund the purchase with cash on hand. As of the April 2, 2018 purchase date, all rights of the holders of the units will terminate, with the exception of the right to receive payment of the purchase price. Upon completion of the purchase, we will own 100 percent of the general and limited partnership interests of TNCLP, and the common units representing limited partner interests will cease to be publicly traded or listed on the NYSE.


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ITEM 9.    CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.
None.
ITEM 9A.    CONTROLS AND PROCEDURES.
(a)    Disclosure Controls and Procedures.    The Company'sCompany’s management, with the participation of the Company'sCompany’s principal executive officer and principal financial officer, has evaluated the effectiveness of the Company'sCompany’s disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act)) as of the end of the period covered by this report. Based on such evaluation, the Company'sCompany’s principal executive officer and principal financial officer have concluded that, as of the end of such period, the Company'sCompany’s disclosure controls and procedures are effective in (i) ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC'sSEC’s rules and forms and (ii) ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the Company'sCompany’s management, including the Company'sCompany’s principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.
(b) Management'sManagement’s Report on Internal Control over Financial Reporting.
Management'sManagement’s Report on Internal Control over Financial Reporting
The Company'sCompany’s management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act, for the Company. Under the supervision and with the participation of our senior management, including our principal executive officer and principal financial officer, we assessed the effectiveness of our internal control over financial reporting as of December 31, 2017,2020, using the criteria set forth in the Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013. Based on this assessment, management has concluded that our internal control over financial reporting is effective as of December 31, 2017.2020. KPMG LLP, the independent registered public accounting firm that audited the Company'sCompany’s consolidated financial statements, has issued an attestation report on the Company'sCompany’s internal control over financial reporting as of December 31, 2017,2020, which appears on the following page.
(c)    Changes in Internal Control over Financial Reporting.    There have not been any changes in the Company'sCompany’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended December 31, 20172020 that have materially affected, or are reasonably likely to materially affect, the Company'sCompany’s internal control over financial reporting.

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Report of Independent Registered Public Accounting Firm


TheTo the Stockholders and Board of Directors
CF Industries Holdings, Inc.:


Opinion on Internal Control Over Financial Reporting


We have audited CF Industries Holdings, Inc. and subsidiaries'subsidiaries’ (the Company) internal control over financial reporting as of December 31, 2017,2020, based on criteria established in Internal ControlIntegrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017,2020, based on criteria established in Internal ControlIntegrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.


We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 20172020 and 2016,2019, the related consolidated statements of operations, comprehensive income, (loss), equity, and cash flows for each of the years in the three-year period ended December 31, 2017,2020, and the related notes (collectively, the consolidated financial statements), and our report dated February 22, 201824, 2021 expressed an unqualified opinion on those consolidated financial statements.


Basis for Opinion


The Company'sCompany’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management'sManagement’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company'sCompany’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.


We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.


Definition and Limitations of Internal Control Over Financial Reporting


A company'scompany’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company'scompany’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company'scompany’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.


(signed) KPMG LLP


Chicago, Illinois
February 22, 2018

24, 2021
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ITEM 9B.    OTHER INFORMATION.
None.
PART III
ITEM 10.    DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE.
Information appearing in the Proxy Statement under the headings "Director Nominees"“Proposal 1: Election of Directors—Director Nominees”; "Executive Officers"“Proposal 1: Election of Directors—Director Nominee Biographies”; "Corporate“Executive Officers”; “Corporate Governance—Committees of the Board—Audit Committee"Committee”; and, "Common Stock Ownership—if required, “Delinquent Section 16(a) Beneficial Ownership Reporting Compliance"Reports” is incorporated herein by reference.
We have adopted a Code of Corporate Conduct that applies to our employees, directors and officers, including our principal executive officer, principal financial officer and principal accounting officer. The Code of Corporate Conduct is posted on our Internet website, www.cfindustries.com.www.cfindustries.com. We will provide an electronic or paper copy of this document free of charge upon request. We intend to disclose on our Internet website any amendment to any provision of the Code of Corporate Conduct that relates to any element of the definition of "code“code of ethics"ethics” enumerated in Item 406(b) of Regulation S-K under the Exchange Act and any waiver from any such provision granted to our principal executive officer, principal financial officer, principal accounting officer or controller or persons performing similar functions.
ITEM 11.    EXECUTIVE COMPENSATION.
Robert C. Arzbaecher, Stephen A. Furbacher,During the last completed fiscal year, Stephen J. Hagge, Javed Ahmed, John D. Johnson, Anne P. Noonan, Edward A. SchmittMichael J. Toelle and Theresa E. Wagler currently serveCelso L. White served as the members of the Compensation and Management Development Committee of the Board.
Information appearing under the following headings of the Proxy Statement is incorporated herein by reference: "Compensation“Compensation Discussion and Analysis," "Compensation” “Compensation Discussion and Analysis—Other Compensation Governance Practices and Considerations—Compensation and Benefits Risk Analysis," "Compensation” “Compensation and Management Development Committee Report," "Executive Compensation"” “Executive Compensation” and "Director“Corporate Governance—Director Compensation."
ITEM 12.    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS.
Information appearing under the following headings of the Proxy Statement is incorporated herein by reference: "Common“Common Stock Ownership—Common Stock Ownership of Certain Beneficial Owners"Owners” and "Common“Common Stock Ownership—Common Stock Ownership of Directors and Management."
We currently issue stock-based compensation under the 2014 Equity and Incentive Plan. Under the 2014 Equity and Incentive Plan, we may grant incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance awards (payable in cash or stock) and other stock or cash-based awards.
Equity Compensation Plan Information as of December 31, 20172020
Plan category
Number of securities
to be issued upon
exercise of
outstanding options,
warrants and rights
(1)
Weighted-average
exercise price of
outstanding options,
warrants and rights
(2)
Number of securities
remaining available for future
issuance under equity
compensation plans
(excluding securities
reflected in the first column)
(3)
Equity compensation plans approved by security holders6,741,928 $40.41 6,028,074 
Equity compensation plans not approved by security holders— — — 
Total6,741,928 $40.41 6,028,074 

(1)Includes 4,569,041 shares issuable pursuant to outstanding nonqualified stock options, 614,094 shares issuable pursuant to restricted stock units (RSUs) and 1,558,793 shares issuable pursuant to performance restricted stock units (PSUs) under our 2014 Equity and Incentive Plan and our 2009 Equity Incentive Plan. PSUs are subject to attainment of the applicable performance goals during the three-year performance period and are reflected at their maximum potential payout. The PSUs shown in the table above reflect the full amount awarded to plan participants in 2018, 2019 and 2020. The three-year performance periods for the PSUs awarded in 2018, 2019 and 2020 are in each case composed of three one-year periods with performance goals set annually. Because accounting rules require performance goals to be set before a PSU is determined for accounting purposes to have been granted, the number of PSUs reported as
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Plan CategoryNumber of securities
to be issued upon
exercise of
outstanding options,
warrants and rights
 Weighted-average
exercise price of
outstanding options,
warrants and rights
 Number of securities
remaining available for future
issuance under equity
compensation plans
(excluding securities
reflected in the first column)
Equity compensation plans approved by security holders6,316,624
 $38.26
 9,539,896
Equity compensation plans not approved by security holders116,110
 $21.94
 
Total6,432,734
 $37.97
 9,539,896
outstanding as of December 31, 2020 in “Note 19—Stock-based Compensation” reflects all of the 2018 PSUs awarded, but only two-thirds of the 2019 PSUs awarded and one-third of the 2020 PSUs awarded.
(2)RSUs and PSUs are not reflected in the weighted exercise price as these awards do not have an exercise price.
(3)Under the 2014 Equity and Incentive Plan, the number of shares available for issuance will be reduced (i) by one share for each share issued pursuant to options and stock appreciation rights and (ii) by 1.61 shares for each share of stock issued pursuant to RSUs and PSUs.
See Note 18—Stock-Based19—Stock-based Compensation for additional information on the 2014 Equity and Incentive Plan.


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ITEM 13.    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE.
Information appearing in the Proxy Statement under the headings "Corporate“Corporate Governance—Director Independence"Independence” and "Policy“Policy Regarding Related Person Transactions"Transactions” is incorporated herein by reference.
ITEM 14.    PRINCIPAL ACCOUNTANT FEES AND SERVICES.
Information appearing in the Proxy Statement under the headings "Audit“Proposal 4: Ratification of Selection of Independent Auditor for 2021—Audit and Non-audit Fees"Non-Audit Fees” and "Pre-approval“Proposal 4: Ratification of Selection of Independent Auditor for 2021—Pre-Approval of Audit and Non-audit Services"Non-Audit Services” is incorporated herein by reference.


PART IV
ITEM 15.    EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.


(a)Documents filed as part of this report:
(a)Documents filed as part of this report:
(1(1))All financial statements:
        The following financial statements are included in Part II, Item 8. Financial Statements and Supplementary Data.Data:
        Financial statement schedules are omitted because they are not applicable or the required information is included in the consolidated financial statements or notes thereto.
(2)Exhibits
(2)Exhibits
A list of exhibits filed with this Annual Report on Form 10-K (or incorporated by reference to exhibits previously filed or furnished) is provided in the Exhibit Index on page 139116 of this report.



ITEM 16.    FORM 10-K SUMMARY.
None.

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EXHIBIT INDEX
EXHIBIT NO.DESCRIPTION

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EXHIBIT NO.DESCRIPTION
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EXHIBIT NO.DESCRIPTION
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EXHIBIT NO.DESCRIPTION

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EXHIBIT NO.DESCRIPTION

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EXHIBIT NO.DESCRIPTION

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EXHIBIT NO.DESCRIPTION

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EXHIBIT NO.DESCRIPTION




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EXHIBIT NO.DESCRIPTION
101The following financial information from CF Industries Holdings, Inc.'s’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017,2020, formatted in Inline XBRL (eXtensible Business Reporting Language): (1) Consolidated Statements of Operations, (2) Consolidated Statements of Comprehensive (Loss) Income, (3) Consolidated Balance Sheets, (4) Consolidated Statements of Equity, (5) Consolidated Statements of Cash Flows and (6) the Notes to Consolidated Financial Statements

*104Portions omitted pursuant to an order granting confidential treatment under Rule 24b-2 of the Securities Exchange Act of 1934, as amended.Cover Page Interactive Data File (included in Exhibit 101)
**Management contract or compensatory plan or arrangement required to be filed (and/or incorporated by reference) as an exhibit to this Annual Report on Form 10-K pursuant to Item 15(a)(3) of Form 10-K.



*    Schedules (or similar attachments) have been omitted pursuant to Item 601(a)(5) of Regulation S-K.
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**    Portions omitted pursuant to an order granting confidential treatment under Rule 24b-2 of the Securities Exchange Act of 1934, as amended.
***    Management contract or compensatory plan or arrangement required to be filed (and/or incorporated by reference) as an exhibit to this Annual Report on Form 10-K pursuant to Item 15(a)(3) of Form 10-K.
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SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
CF INDUSTRIES HOLDINGS, INC.
Date:February 22, 201824, 2021By:/s/ W. ANTHONY WILL  
W. Anthony Will
President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
SignatureTitle(s)Date
/s/ W. ANTHONY WILLPresident and Chief Executive Officer,
Director
(Principal Executive Officer)
February 24, 2021
W. Anthony Will
SignatureTitle(s)Date
/s/ W. ANTHONY WILLCHRISTOPHER D. BOHN
President and Chief Executive Officer,
Director
(Principal Executive Officer)
February 22, 2018
W. Anthony Will
/s/ DENNIS P. KELLEHER
Senior Vice President and

Chief Financial Officer

(Principal Financial Officer)
February 22, 201824, 2021
Dennis P. KelleherChristopher D. Bohn
/s/ RICHARD A. HOKER
Vice President and Corporate Controller

(Principal Accounting Officer)
February 22, 201824, 2021
Richard A. Hoker
/s/ STEPHEN A. FURBACHERChairman of the BoardFebruary 22, 201824, 2021
Stephen A. Furbacher
/s/ JAVED AHMEDDirectorFebruary 24, 2021
Javed Ahmed
/s/ ROBERT C. ARZBAECHERDirectorFebruary 22, 201824, 2021
Robert C. Arzbaecher
/s/ WILLIAM DAVISSONDirectorFebruary 22, 201824, 2021
William Davisson
/s/ JOHN W. EAVESDirectorFebruary 22, 201824, 2021
John W. Eaves
/s/ STEPHEN J. HAGGEDirectorFebruary 22, 201824, 2021
Stephen J. Hagge
/s/ JOHN D. JOHNSONDirectorFebruary 22, 2018
John D. Johnson
/s/ ROBERT G. KUHBACHDirectorFebruary 22, 2018
Robert G. Kuhbach
/s/ ANNE P. NOONANDirectorFebruary 22, 201824, 2021
Anne P. Noonan
/s/ EDWARD A. SCHMITTDirectorFebruary 22, 2018
Edward A. Schmitt
/s/ MICHAEL J. TOELLEDirectorFebruary 22, 201824, 2021
Michael J. Toelle
/s/ THERESA E. WAGLERDirectorFebruary 22, 201824, 2021
Theresa E. Wagler
/s/ CELSO L. WHITEDirectorFebruary 24, 2021
Celso L. White


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