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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Loans to Policyholders at Unpaid Principal $ 301.4 $ 300.6
Real Estate at Depreciated Cost 113.6 114.2
Mortgage Loans on Real Estate, Commercial and Consumer, Net 10.6 0.0
Total $ 425.6 $ 414.8