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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Loans Receivable, Fair Value Disclosure $ 533.7 $ 560.3
Loans to Policyholders at Unpaid Principal 296.5 298.6
Real Estate at Depreciated Cost 115.2 116.8
Trading Securities at Fair Value 0.0 6.7
Other 0.0 0.1
Total $ 411.7 $ 422.2