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Reserves for Losses and Loss Adjustment Expenses - Short-duration Insurance Contracts Reconciliation Of Claims Development To Liability (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for claims and claims adjustment expenses, net of reinsurance $ 4,749.0      
Reinsurance recoverable on unpaid losses 779.4      
Unallocated claims incurred 41.6      
Other 1.4      
Liability for unpaid claims and claim adjustment expense, aggregate reconciling items 43.0      
Losses and loss adjustment expenses 5,571.4 $ 5,319.9 $ 5,181.5 $ 4,938.2
Insurance lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for claims and claims adjustment expenses, net of reinsurance 2,319.7      
Reinsurance recoverable on unpaid losses 653.3      
Reinsurance lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for claims and claims adjustment expenses, net of reinsurance 2,429.3      
Reinsurance recoverable on unpaid losses 126.1      
Insurance lines other than short-duration        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Losses and loss adjustment expenses $ 0.0