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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Loans to Policyholders at Unpaid Principal $ 296.5 $ 298.6
Real Estate at Depreciated Cost 116.4 116.8
Trading Securities at Fair Value 0.0 6.7
Other 0.1 0.1
Total $ 413.0 $ 422.2