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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fixed maturity securities    
Proceeds received $ 77.8 $ 88.0
Gross gains realized 1.2 1.3
Gross losses realized (1.0) (1.4)
Equity securities    
Proceeds received 0.0 0.0
Gross gains realized 0.0 0.0
Gross losses realized $ 0.0 $ 0.0