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Investments - Other Investments Carrying Values (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Loans to Policyholders at Unpaid Principal $ 298.6 $ 294.2
Real Estate at Depreciated Cost 116.8 140.2
Trading Securities at Fair Value 6.7 5.3
Other 0.1 0.2
Total Investments $ 422.2 $ 439.9