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Commitments and Contingencies (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Entity Information [Line Items]    
Net assets of subsidiaries subject to restrictions $ 1,072.0 $ 859.0
Aggregate statutory capital and surplus 1,166.0  
Required minimum statutory capital surplus 592.0  
Parent Company    
Entity Information [Line Items]    
Restricted cash and investments $ 471.8 $ 202.6