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Schedule IV - Reinsurance Premiums Written and Premiums Earned (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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