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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, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Provision for losses and LAE at the start of the year $ 6,749.5 $ 5,319.9 $ 5,319.9  
Net loss and LAE at the start of the year 5,234.3 4,759.2 4,759.2  
Net loss and LAE expenses (disposed) 0.0 0.0 (125.5)  
Provision for losses and LAE for claims incurred:        
Current year 700.8 749.2 2,100.1  
Prior years (80.2) (74.9) (105.4)  
Total incurred 620.6 674.3 1,994.7  
Losses and LAE payments for claims incurred:        
Current year (49.7) (54.4) (397.5)  
Prior years (874.7) (686.7) (1,157.6)  
Total paid (924.4) (741.1) (1,555.1)  
Foreign exchange losses/(gains) (54.1) 99.6 161.0  
Net losses and LAE reserves at period end 4,876.4 4,792.0 5,234.3  
Plus reinsurance recoverable on unpaid losses at period end 1,656.4 779.4 1,515.2 $ 560.7
Provision for losses and LAE at the end of the relevant period $ 6,532.8 $ 5,571.4 $ 6,749.5