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Investments - Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Interest on cash and cash equivalents $ 2.8 $ 1.3 $ 5.0 $ 2.5
Fixed maturities income 1.9 1.2 3.7 2.6
Short-term investment income 1.5 3.0 3.5 6.0
Total gross investment income 6.2 5.5 12.2 11.1
Investment expenses (0.1) (0.1) (0.2) (0.3)
Net investment income $ 6.1 $ 5.4 $ 12.0 $ 10.8