Document and Entity Information
Document and Entity Information | Dec. 01, 2021 |
Cover [Abstract] | |
Amendment Flag | true |
Entity Central Index Key | 0000354190 |
Document Type | 8-K/A |
Document Period End Date | Dec. 1, 2021 |
Entity Registrant Name | ARTHUR J. GALLAGHER & CO. |
Entity Incorporation State Country Code | DE |
Entity File Number | 1-09761 |
Entity Tax Identification Number | 36-2151613 |
Entity Address, Address Line One | 2850 W. Golf Road |
Entity Address, City or Town | Rolling Meadows |
Entity Address, State or Province | IL |
Entity Address, Postal Zip Code | 60008-4050 |
City Area Code | (630) |
Local Phone Number | 773-3800 |
Written Communications | false |
Soliciting Material | false |
Pre Commencement Tender Offer | false |
Pre Commencement Issuer Tender Offer | false |
Security 12b Title | Common Stock, $1.00 par value |
Trading Symbol | AJG |
Security Exchange Name | NYSE |
Entity Emerging Growth Company | false |
Amendment Description | On December 1, 2021, Arthur J. Gallagher & Co. (the “Company”) filed a Current Report on Form 8-K (the “Original Form 8-K”) to report the completion of an acquisition by the Company of the treaty reinsurance brokerage operations of Willis Towers Watson plc (the “Seller” and such acquired treaty reinsurance brokerage operations, “Willis Re DivestCo”), pursuant to a Security and Asset Purchase Agreement entered into on August 12, 2021 and amended on December 1, 2021 between the Company and the Seller. This amendment to the Original Form 8-K is being filed to provide financial statements of Willis Re DivestCo and pro forma financial information as required by Item 9.01 of Form 8-K. |