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Investments - Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Interest on cash and cash equivalents $ 2.1 $ 2.2
Fixed maturities income 2.8 1.8
Short-term investment income 1.1 2.0
Total gross investment income 6.0 6.0
Investment expenses (0.2) (0.1)
Net investment income $ 5.8 $ 5.9