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Concentration of Credit Risk - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Concentration Risk [Line Items] |  |  |
Amount recoverable from reinsurers | $ 4,172.0 | $ 4,577.8 |
Concentration risk | 0.559 | 0.568 |
Reinsurance Recoverable, Allowance for Credit Loss | $ 27.5 | $ 3.7 | $ 3.7
Underwriting premiums receivables (net of allowance for expected credit losses of 2024: $24.6 and 2023: $21.0) | 1,617.0 | 1,435.3 |
Due for settlement | 111.1 |  |
Underwriting premiums receivables, allowance for expected credit losses | $ 24.6 | $ 21.0 |
Allowable holdings of a single issue or issuer, percentage | 2.00% |  |
Maximum |  |  |
Concentration Risk [Line Items] |  |  |
Gross written premiums, percentage | 15.40% | 15.90% |
Minimum |  |  |
Concentration Risk [Line Items] |  |  |
Gross written premiums, percentage | 8.80% | 9.20% |
Median |  |  |
Concentration Risk [Line Items] |  |  |
Gross written premiums, percentage | 11.50% | 11.10% |
A- rating or higher |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 0.440 | 0.429 |
A- rating or lower |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 0.001 | 0.003 |

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