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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Company-Owned Life Insurance $ 320.4 $ 217.0
Loans to Policyholders at Unpaid Principal 307.1 305.6
Real Estate at Depreciated Cost 108.6 111.4
Mortgage Loans and Other 24.1 27.5
Total $ 760.2 $ 661.5