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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |
Direct | $ 2,531.7 | $ 2,341.4 | $ 2,042.1
Assumed | 1,807.0 | 1,597.0 | 1,656.4
Ceded | (1,442.7) | (1,350.7) | (1,120.7)
Net written premiums | 2,896.0 | 2,587.7 | 2,577.8
Gross Amount | 2,370.8 | 2,139.1 | 2,026.4
Assumed From Other Companies | 1,617.2 | 1,479.2 | 1,612.0
Ceded | (1,299.3) | (1,207.8) | (1,110.9)
Net premiums earned | $ 2,688.7 | $ 2,410.5 | $ 2,527.5
Percentage of Amount Assumed to Net | 60.10% | 61.40% | 63.80%
Gross written premiums | $ 4,338.7 | $ 3,938.4 | $ 3,698.5

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