XML 75 R64.htm IDEA: XBRL DOCUMENT v3.8.0.1
Reserves for Losses and Loss Adjustment Expenses - Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses ("LAE") Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 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 347.9 354.4 2,100.1  
Prior years (37.7) (26.2) (105.4)  
Total incurred 310.2 328.2 1,994.7  
Losses and LAE payments for claims incurred:        
Current year (7.4) (14.8) (397.5)  
Prior years (483.7) (383.6) (1,157.6)  
Total paid (491.1) (398.4) (1,555.1)  
Foreign exchange losses/(gains) 14.7 41.1 161.0  
Net losses and LAE reserves at period end 5,068.1 4,730.1 5,234.3  
Plus reinsurance recoverable on unpaid losses at period end 1,611.3 635.8 1,515.2 $ 560.7
Provision for losses and LAE at the end of the relevant period $ 6,679.4 $ 5,365.9 $ 6,749.5