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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Company-Owned Life Insurance $ 556.4 $ 448.1
Loans to Policyholders at Unpaid Principal 284.7 286.2
Real Estate at Depreciated Cost 93.3 94.0
Mortgage Loans and Other 100.8 97.3
Total $ 1,035.2 $ 925.6