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Segment Reporting - Summary of Gross and Net Written and Earned Premiums, Underwriting Results, Ratios and Reserves for Each of Company's Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Underwriting Revenues        
Gross written premiums $ 998.0 $ 975.7    
Net written premiums 686.2 799.7    
Gross earned premiums 751.3 752.4    
Net earned premiums 581.1 663.1    
Underwriting Expenses        
Losses and loss adjustment expenses 328.2 357.4    
Amortization of deferred policy acquisition costs 113.7 130.2    
General and administrative expenses 105.7 102.7    
Underwriting income 33.5 72.8    
Corporate expenses (13.4) (17.1)    
Non-operating expenses (2.2)      
Net investment income 47.7 49.5    
Realized and unrealized investment gains 51.2 65.6    
Realized and unrealized investment losses (5.0) (20.6)    
Change in fair value of loan notes issued by variable interest entities (2.9) (4.4)    
Change in fair value of derivatives 3.1 (7.2)    
Interest expense on long term debt (7.4) (7.4)    
Net realized and unrealized foreign exchange gains (8.9) (15.7)    
Net other income 3.6 1.4    
Income from operations before income tax 99.3 116.9    
Net reserves for loss and loss adjustment expenses $ 4,730.1 $ 4,645.5 $ 4,759.2 $ 4,583.4
Ratios        
Loss ratio 56.50% 53.90%    
Policy acquisition expense ratio 19.60% 19.60%    
General and administrative expense ratio 20.90% 18.10%    
Expense ratio 40.50% 37.70%    
Combined ratio 97.00% 91.60%    
Reinsurance        
Underwriting Revenues        
Gross written premiums $ 565.3 $ 517.6    
Net written premiums 448.2 449.5    
Gross earned premiums 327.6 306.8    
Net earned premiums 277.5 280.3    
Underwriting Expenses        
Losses and loss adjustment expenses 143.1 134.5    
Amortization of deferred policy acquisition costs 59.5 59.4    
General and administrative expenses 43.9 44.1    
Underwriting income 31.0 42.3    
Net reserves for loss and loss adjustment expenses $ 2,445.4 $ 2,433.0    
Ratios        
Loss ratio 51.60% 48.00%    
Policy acquisition expense ratio 21.40% 21.20%    
General and administrative expense ratio 15.80% 15.70%    
Expense ratio 37.20% 36.90%    
Combined ratio 88.80% 84.90%    
Insurance        
Underwriting Revenues        
Gross written premiums $ 432.7 $ 458.1    
Net written premiums 238.0 350.2    
Gross earned premiums 423.7 445.6    
Net earned premiums 303.6 382.8    
Underwriting Expenses        
Losses and loss adjustment expenses 185.1 222.9    
Amortization of deferred policy acquisition costs 54.2 70.8    
General and administrative expenses 61.8 58.6    
Underwriting income 2.5 30.5    
Net reserves for loss and loss adjustment expenses $ 2,284.7 $ 2,212.5    
Ratios        
Loss ratio 61.00% 58.20%    
Policy acquisition expense ratio 17.90% 18.50%    
General and administrative expense ratio 20.40% 15.30%    
Expense ratio 38.30% 33.80%    
Combined ratio 99.30% 92.00%