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v3.25.1

Commitments and contingencies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Dec. 30, 2024 | Feb. 26, 2021 | Mar. 31, 2025 | Mar. 31, 2024
Other Commitments [Line Items] |  |  |  |
Dividends paid to preference shareholders |  |  | $ 4.0 | $ 4.0
Operating lease expense |  |  | $ 1.9 | 2.2
Merger warrants |  |  |  |
Other Commitments [Line Items] |  |  |  |
Warrants repurchased (in shares) | 20,991,337 |  |  |
Warrants price (in dollars per share) | $ 3.56 |  |  |
Liability-classified capital instruments | Series A preference shares |  |  |  |
Other Commitments [Line Items] |  |  |  |
Losses from the change in fair value |  |  |  | 3.9
Liability-classified capital instruments | Merger warrants |  |  |  |
Other Commitments [Line Items] |  |  |  |
Losses from the change in fair value |  |  |  | 12.0
Sirius Group | Series A preference shares |  |  |  |
Other Commitments [Line Items] |  |  |  |
Dividends paid to preference shareholders |  |  |  | $ 0.0
Sirius Group | Series A preference shares |  |  |  |
Other Commitments [Line Items] |  |  |  |
Par value (in dollars per share) |  | $ 0.10 |  |
Issuance of SiriusPoint common shares (in shares) |  | 11,720,987 |  |

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