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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Loans to Policyholders at Unpaid Principal $ 295.5 $ 294.2
Real Estate at Depreciated Cost 118.1 140.2
Trading Securities at Fair Value 6.3 5.3
Other 0.1 0.2
Total $ 420.0 $ 439.9