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Reserves for Unpaid Losses and Loss Adjustment Expenses Reserves for Unpaid Losses and Loss Adjustment Expenses (Reconciliation of Reserves) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Insurance [Abstract]        
Statutory reserves (unaudited) $ 1,192.7 $ 1,203.8 $ 1,180.6 $ 974.1
Reinsurance recoverable on unpaid losses and LAE 172.9 186.0    
GAAP reserves $ 1,365.6 $ 1,389.8 $ 1,342.2 $ 1,054.3