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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Equity Securities at Modified Cost $ 24.8 $ 32.6
Real Estate at Depreciated Cost 93.6 94.7
Mortgage Loans on Real Estate, Commercial and Consumer, Net 83.1 99.8
Investments and Other Noncurrent Assets 0.9 14.8
Total $ 202.4 $ 241.9