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Concentration of Credit Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2021 USD ($)
Concentration Risk [Line Items]
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments	$ 4,577.8	$ 4,897.7	$ 4,431.3	$ 4,596.7
Concentration risk	0.568	0.573
Reinsurance Recoverable, Allowance for Credit Loss	$ 3.7	$ 3.7	11.5		$ 3.3
Underwriting premiums receivables	1,435.3	1,482.4	1,819.1
Due for settlement	8.7
Underwriting premiums receivable, allowance for expected credit losses	$ 21.0	$ 25.0	$ 24.3
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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