Cover
Cover - USD ($) | 12 Months Ended | ||
Dec. 31, 2019 | Apr. 01, 2020 | Jun. 30, 2019 | |
Cover [Abstract] | |||
Document Type | 10-K/A | ||
Amendment Flag | false | ||
Document Annual Report | true | ||
Document Transition Report | false | ||
Document Period End Date | Dec. 31, 2019 | ||
Document Fiscal Period Focus | FY | ||
Document Fiscal Year Focus | 2019 | ||
Current Fiscal Year End Date | --12-31 | ||
Entity File Number | 001-38731 | ||
Entity Registrant Name | SIRIUS INTERNATIONAL INSURANCE GROUP, LTD. | ||
Entity Central Index Key | 0001744894 | ||
Entity Tax Identification Number | 98-0529995 | ||
Entity Incorporation, State or Country Code | D0 | ||
Entity Address, Address Line One | 14 Wesley Street | ||
Entity Address, City or Town | Hamilton | ||
Entity Address, Country | BM | ||
Entity Address, Postal Zip Code | HM 11 | ||
City Area Code | 441 | ||
Local Phone Number | 278-3140 | ||
Title of 12(b) Security | Common shares, par value $0.01 per share | ||
Trading Symbol | SG | ||
Security Exchange Name | NASDAQ | ||
Entity Well-known Seasoned Issuer | No | ||
Entity Voluntary Filers | No | ||
Entity Current Reporting Status | Yes | ||
Entity Interactive Data Current | Yes | ||
Entity Filer Category | Non-accelerated Filer | ||
Entity Small Business | true | ||
Entity Emerging Growth Company | false | ||
Entity Shell Company | false | ||
Entity Public Float | $ 52,400,000 | ||
Entity Common Stock, Shares Outstanding | 115,299,341 |