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Investments - Other Investments Carrying Values (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Equity Securities at Modified Cost $ 38.4 $ 32.3
Convertible Securities at Fair Value 43.3 46.4
Real Estate at Depreciated Cost 93.6 94.0
Mortgage Loans 91.1 96.8
Other 3.5 0.5
Total Investments $ 269.9 $ 270.0