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Investments - Other Investments Carrying Values (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Company-owned Life Insurance $ 327.4 $ 217.0
Loans to Policyholders at Unpaid Principal 297.9 305.6
Real Estate at Depreciated Cost 98.7 111.4
Mortgage Loans and Other 55.0 27.5
Total Investments $ 779.0 $ 661.5