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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Loans to Policyholders at Unpaid Principal $ 290.4 $ 288.4
Real Estate at Depreciated Cost 145.2 149.8
Trading Securities at Fair Value 5.0 4.7
Other 0.2 0.3
Total $ 440.8 $ 443.2