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Earnings per share - Diluted earnings per share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income (loss) available to Sirius Group common shareholders $ 86.4 $ 38.8
Add: Change in carrying value of Series B preference shares 8.4  
Net income available to Sirius Group common shareholders on a diluted basis $ 94.8 $ 38.8
Denominator:    
Weighted average shares outstanding for basic earnings per share 115,182,331 120,000,000
Add: Series B preference shares 11,901,670  
Add: Unvested performance share units and restricted share units 251,313  
Weighted average shares outstanding for diluted earnings per share 127,335,314 120,000,000
Earnings per share    
Diluted earnings per share $ 0.74 $ 0.32
Potentially dilutive securities excluded from the calculation of Diluted earnings per share 19,510,830 0