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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
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for claims and claims adjustment expenses, net of reinsurance $ 4,917.5      
Reinsurance recoverable on unpaid losses 1,767.1      
Unallocated claims incurred 47.3      
Other (5.7)      
Liability for unpaid claims and claim adjustment expense, aggregate reconciling items 41.6      
Losses and loss adjustment expenses 6,726.2 $ 6,749.5 $ 6,490.6 $ 5,319.9
Insurance lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for claims and claims adjustment expenses, net of reinsurance 2,106.1      
Reinsurance recoverable on unpaid losses 1,448.6      
Reinsurance lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for claims and claims adjustment expenses, net of reinsurance 2,811.4      
Reinsurance recoverable on unpaid losses 318.5      
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