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Earnings (loss) per share available to SiriusPoint common shareholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted-average number of common shares outstanding:                      
Basic number of common shares outstanding (in shares) 92,638,978 92,613,393 92,593,599 92,191,837 91,989,469 91,903,556 91,776,870 91,669,810 92,510,090 91,835,990 97,054,315
Dilutive effect of options (in shares)                 0 125,530 0
Dilutive effect of warrants (in shares)                 0 91,884 0
Dilutive effect of restricted shares with service and performance condition                 447,709 598,912 0
Diluted number of common shares outstanding (in shares) 93,165,559 92,969,646 92,738,293 92,191,837 92,696,491 91,903,556 92,801,799 92,578,933 92,957,799 92,652,316 97,054,315
Basic earnings (loss) per common share:                      
Net income (loss) available to SiriusPoint common shareholders $ 134,396 $ 68,743 $ 124,015 $ (183,637) $ 29,738 $ (15,099) $ 53,065 $ 132,915 $ 143,517 $ 200,619 $ (317,692)
Net income allocated to SiriusPoint participating common shareholders                 (1,106) (643) 0
Net income (loss) allocated to SiriusPoint common shareholders                 $ 142,411 $ 199,976 $ (317,692)
Basic earnings (loss) per share available to SiriusPoint common shareholders (in dollars per share) $ 1.43 $ 0.74 $ 1.33 $ (1.99) $ 0.32 $ (0.16) $ 0.58 $ 1.45 $ 1.54 $ 2.18 $ (3.27)
Earnings Per Share, Diluted [Abstract]                      
Net income (loss) available to SiriusPoint common shareholders $ 134,396 $ 68,743 $ 124,015 $ (183,637) $ 29,738 $ (15,099) $ 53,065 $ 132,915 $ 143,517 $ 200,619 $ (317,692)
Net income allocated to SiriusPoint participating common shareholders                 (1,101) (637) 0
Net income (loss) allocated to SiriusPoint common shareholders                 $ 142,416 $ 199,982 $ (317,692)
Diluted earnings (loss) per share available to SiriusPoint common shareholders (in dollars per share) $ 1.43 $ 0.73 $ 1.33 $ (1.99) $ 0.32 $ (0.16) $ 0.57 $ 1.43 $ 1.53 $ 2.16 $ (3.27)
Antidilutive securities excluded from computation of earnings per share                 3,741,266    
Options and Warrants                      
Earnings Per Share, Diluted [Abstract]                      
Antidilutive securities excluded from computation of earnings per share                 3,494,979 3,719,404 9,820,795