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Commitments and Contingencies - Restricted Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]    
Other fixed maturities-state deposits $ 13.6 $ 13.5
Securities pledged 680.4 249.2
Total restricted assets 694.0 262.7
Securities pledged as collateral    
Loss Contingencies [Line Items]    
Fair value of loaned securities 474.9 178.9
Fair value of securities delivered as collateral $ 205.5 $ 70.3