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v3.25.1

Loss and loss adjustment expense reserves - Narrative (Details) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Apr. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Prior year loss reserve development | $ (34.2) | $ (38.9) |  |  |  |
Loss reserves |  |  |  | $ 400.0 | $ 905.6 | $ 1,300.0
Funds held liability |  |  | $ 275.8 |  |  |
Aggregate limit, percentage of booked reserves | 1.30 |  |  | 1.50 |  |
Reinsurance balances payable | $ 1,707.5 |  | 1,781.6 |  |  |
Deferred gain on retroactive reinsurance | 6.6 |  | $ 8.5 |  |  |
Pallas Reinsurance Company Ltd. |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Reinsurance balances payable | 509.3 |  |  |  |  |
Reinsurance recoverable | $ 530.7 |  |  |  |  |

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