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Earnings per share available to SiriusPoint common shareholders - Computation of Basic and Diluted Earnings Per Share available to SiriusPoint Common Shareholders (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Weighted-average number of common shares outstanding:    
Basic number of common shares outstanding (in shares) 115,975,961 168,934,114
Dilutive effect of warrants (in shares) 0 1,605,246
Diluted number of common shares outstanding (in shares) 118,555,166 174,380,963
Basic earnings per common share:    
Net income available to SiriusPoint common shareholders $ 57.6 $ 90.8
Net income allocated to SiriusPoint participating shareholders (0.1) (6.1)
Net income allocated to SiriusPoint common shareholders $ 57.5 $ 84.7
Basic earnings per share available to SiriusPoint common shareholders (in dollars per share) $ 0.50 $ 0.50
Diluted earnings per common share:    
Net income available to SiriusPoint common shareholders $ 57.6 $ 90.8
Net income allocated to SiriusPoint participating shareholders (0.1) (6.1)
Net income allocated to SiriusPoint common shareholders $ 57.5 $ 84.7
Diluted earnings per share available to SiriusPoint common shareholders (in dollars per share) $ 0.49 $ 0.49
Restricted share awards and units    
Weighted-average number of common shares outstanding:    
Dilutive effect of restricted share awards and units and options (in shares) 1,503,925 2,811,088
Options    
Weighted-average number of common shares outstanding:    
Dilutive effect of restricted share awards and units and options (in shares) 1,075,280 1,030,515