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Investments - Other Investments Carrying Values (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Company-Owned Life Insurance $ 448.1 $ 327.4
Loans to Policyholders at Unpaid Principal 286.2 297.9
Real Estate at Depreciated Cost 94.0 98.7
Mortgage Loans on Real Estate and Other 97.3 55.0
Total Investments $ 925.6 $ 779.0