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Earnings per share - Basic and Diluted earnings per share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Numerator:    
Net (loss) income $ (121.3) $ 104.1
Less: Income attributable to non-controlling interests (0.2) (0.4)
Less: Change in carrying value of Series B preference shares 23.4 (8.4)
Net (loss) income attributable to Sirius Group's common shareholders (98.1) 95.3
Less: Earnings attributable to Series B preference shares 0.0 (8.9)
Net income available to Sirius Group common shareholders (98.1) 86.4
Add: Change in carrying value of Series B preference shares (23.4) 8.4
Net income available to Sirius Group common shareholders on a diluted basis $ (121.5) $ 94.8
Denominator:    
Weighted average shares outstanding for basic earnings per share (in shares) 115,262,302 115,182,331
Add: Series B preference shares (in shares) 11,901,670 11,901,670
Add: Unvested performance share units and restricted share units (in shares) 0 251,313
Weighted average shares outstanding for diluted earnings per share (in shares) 127,163,972 127,335,314
Earnings per share    
Basic earnings per share (in usd per share) $ (0.85) $ 0.75
Diluted earnings per share (in usd per share) $ (0.96) $ 0.74
Potentially dilutive securities excluded from the calculation of Diluted earnings per share (in shares) 15,972,398 19,510,830