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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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Liability for Claims And Claims Adjustment Expense, Deferred Gain On Retroactive Reinsurance Contracts

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Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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