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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Company-Owned Life Insurance $ 440.7 $ 327.4
Loans to Policyholders at Unpaid Principal 289.6 297.9
Real Estate at Depreciated Cost 95.8 98.7
Mortgage Loans and Other 95.4 55.0
Total $ 921.5 $ 779.0