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Concentration of Credit Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Concentration Risk [Line Items]
Amount recoverable from reinsurers	$ 4,577.8	$ 4,897.7
Concentration risk	0.568	0.573
Reinsurance Recoverable, Allowance for Credit Loss	$ 3.7	$ 3.7	$ 3.3
Underwriting premiums receivables (net of allowance for expected credit losses of 2023: $21.0 and 2022: $25.0)	1,435.3	1,482.4
Due for settlement	8.7
Premium Receivable, Allowance for Credit Loss	$ 21.0	$ 25.0
Allowable holdings of a single issue or issuer, percentage	2.00%
Maximum
Concentration Risk [Line Items]
Gross written premiums, percentage	15.90%	16.30%
Minimum
Concentration Risk [Line Items]
Gross written premiums, percentage	9.20%	8.20%
Median
Concentration Risk [Line Items]
Gross written premiums, percentage	11.10%	9.70%
A- rating or higher
Concentration Risk [Line Items]
Concentration risk	0.429	0.423
A- rating or lower
Concentration Risk [Line Items]
Concentration risk	0.003	0.004

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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

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Amount of allowance for credit loss on reinsurance recoverable.

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Amount, after 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, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts.

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