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Schedule IV - Reinsurance Premiums Written and Premiums Earned (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]      
Insurance $ 2,446.6 $ 2,531.7 $ 2,341.4
Reinsurance 1,521.0 1,807.0 1,597.0
Ceded (1,385.7) (1,442.7) (1,350.7)
Net written premiums 2,581.9 2,896.0 2,587.7
Gross Amount 2,444.8 2,370.8 2,139.1
Assumed From Other Companies 1,562.0 1,617.2 1,479.2
Ceded (1,392.3) (1,299.3) (1,207.8)
Net premiums earned $ 2,614.5 $ 2,688.7 $ 2,410.5
Percentage of Amount Assumed to Net 59.70% 60.10% 61.40%
Gross written premiums $ 3,967.6 $ 4,338.7 $ 3,938.4