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Reserves for Losses and Loss Adjustment Expenses - Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses ("LAE") Reserves (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Provision for losses and LAE at the start of the year $ 5,319.9 $ 4,938.2 $ 4,938.2  
Net loss and LAE at the start of the year 4,759.2 4,583.4 4,583.4  
Net loss and LAE expenses assumed 0.0 5.7 (80.1)  
Provision for losses and LAE for claims incurred:        
Current year 749.2 842.4 1,705.4  
Prior years (74.9) (42.8) (129.3)  
Total incurred 674.3 799.6 1,576.1  
Losses and LAE payments for claims incurred:        
Current year (54.4) (21.0) (241.0)  
Prior years (686.7) (555.2) (981.8)  
Total paid (741.1) (576.2) (1,222.8)  
Foreign exchange losses/(gains) 99.6 (41.4) (97.4)  
Net losses and LAE reserves at period end 4,792.0 4,771.1 4,759.2  
Plus reinsurance recoverable on unpaid losses at period end 779.4 410.4 560.7 $ 354.8
Provision for losses and LAE at the end of the relevant period $ 5,571.4 $ 5,181.5 $ 5,319.9