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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Equity Securities at Modified Cost $ 22.2 $ 22.5
Real Estate at Depreciated Cost 93.3 99.5
Mortgage Loans 148.2 75.3
Other 5.9 2.2
Total $ 287.0 $ 217.1