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v3.25.1

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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Premiums written: |  |  |
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
Premiums earned: |  |  |
Insurance | 2,565.7 | 2,444.8 | 2,370.8
Reinsurance | 1,822.1 | 1,562.0 | 1,617.2
Ceded | (1,498.1) | (1,392.3) | (1,299.3)
Net earned premiums | 2,889.7 | 2,614.5 | 2,688.7
Losses and loss adjustment expenses: |  |  |
Insurance | 1,759.1 | 1,644.5 | 1,574.2
Reinsurance | 915.8 | 707.2 | 939.5
Ceded | (957.1) | (798.7) | (833.7)
Losses and loss adjustment expenses | $ 1,717.8 | $ 1,553.0 | $ 1,680.0

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