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Concentration of Credit Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Concentration Risk [Line Items]
Amount recoverable from reinsurers	$ 4,172.0	$ 4,577.8
Concentration risk	0.559	0.568
Reinsurance Recoverable, Allowance for Credit Loss	$ 27.5	$ 3.7	$ 3.7
Underwriting premiums receivables (net of allowance for expected credit losses of 2024: $24.6 and 2023: $21.0)	1,617.0	1,435.3
Due for settlement	111.1
Premium Receivable, Allowance for Credit Loss	$ 24.6	$ 21.0
Allowable holdings of a single issue or issuer, percentage	2.00%
Maximum
Concentration Risk [Line Items]
Gross written premiums, percentage	15.40%	15.90%
Minimum
Concentration Risk [Line Items]
Gross written premiums, percentage	8.80%	9.20%
Median
Concentration Risk [Line Items]
Gross written premiums, percentage	11.50%	11.10%
A- rating or higher
Concentration Risk [Line Items]
Concentration risk	0.440	0.429
A- rating or lower
Concentration Risk [Line Items]
Concentration risk	0.001	0.003

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Percentage Of Allowable Holdings Of A Single Issuer Or Issuer, Minimum

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Premiums receivable non current

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Premiums written gross percentage

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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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The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts.

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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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