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Schedule IV - Reinsurance Premiums Written and Premiums Earned (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]      
Insurance $ 2,723.5 $ 2,446.6 $ 2,531.7
Reinsurance 1,885.8 1,521.0 1,807.0
Ceded (1,666.7) (1,385.7) (1,442.7)
Net written premiums 2,942.6 2,581.9 2,896.0
Gross Amount 2,565.7 2,444.8 2,370.8
Assumed From Other Companies 1,822.1 1,562.0 1,617.2
Ceded (1,498.1) (1,392.3) (1,299.3)
Net premiums earned $ 2,889.7 $ 2,614.5 $ 2,688.7
Percentage of Amount Assumed to Net Amount 63.10% 59.70% 60.10%
Gross written premiums $ 4,609.3 $ 3,967.6 $ 4,338.7