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v3.24.1

Reinsurance - Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Premiums written: |  |  |
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
Premiums earned: |  |  |
Insurance | 2,444.8 | 2,370.8 | 2,139.1
Reinsurance | 1,562.0 | 1,617.2 | 1,479.2
Ceded | (1,392.3) | (1,299.3) | (1,207.8)
Net earned premiums | 2,614.5 | 2,688.7 | 2,410.5
Losses and loss adjustment expenses: |  |  |
Insurance | 1,644.5 | 1,574.2 | 1,499.8
Reinsurance | 707.2 | 939.5 | 1,000.6
Ceded | (798.7) | (833.7) | (807.1)
Losses and loss adjustment expenses | $ 1,553.0 | $ 1,680.0 | $ 1,693.3

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