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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Premiums written: |  |  |
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 premiums written | 2,896.0 | 2,587.7 | 2,577.8
Premiums earned: |  |  |
Direct | 2,370.8 | 2,139.1 | 2,026.4
Assumed | 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
Insurance losses and loss adjustment expenses: |  |  |
Direct | 1,574.2 | 1,499.8 | 1,479.6
Assumed | 939.5 | 1,000.6 | 1,134.5
Ceded | (833.7) | (807.1) | (773.3)
Net insurance losses and loss adjustment expenses | $ 1,680.0 | $ 1,693.3 | $ 1,840.8

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