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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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