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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Company-owned Life Insurance $ 429.5 $ 327.4
Loans to Policyholders at Unpaid Principal 295.1 297.9
Real Estate at Depreciated Cost 98.0 98.7
Mortgage Loans and Other 74.2 55.0
Total $ 896.8 $ 779.0