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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Loans to Policyholders at Unpaid Principal $ 302.7 $ 300.6
Real Estate at Depreciated Cost 112.3 114.2
Mortgage Loans 32.4 0.0
Total $ 447.4 $ 414.8