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Reserves for unpaid losses and loss adjustment expenses - By segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development $ (103.8) $ 7.3 $ 0.6
Asbestos losses 0.0 (6.9) 59.0
Accretion of fair value adjustment to net loss and LAE reserves 0.1 0.1 0.1
Pre-tax un-accreted adjustment 0.7    
Global Reinsurance      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development (103.6) (25.3)  
Other property      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development   (34.9)  
Property Catastrophe Excess      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development   (13.2)  
Hurricanes Harvey, Irma and Maria      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development   (21.4)  
Global A&H      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development   15.0  
U.S. Specialty      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development     (9.9)
Marine      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development   6.8 (5.4)
Trade credit      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development     (4.2)
Aviation & Space      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development   7.9 (1.7)
Contingency      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development     (0.8)
Casualty      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development $ (13.0)    
Runoff & Other      
Reserves for unpaid losses and loss adjustment expenses      
Unfavorable (favorable) loss reserve development   $ 17.6 $ (45.7)