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Related-Party Transactions - Narrative (Details)			9 Months Ended
	Jan. 01, 2023	Dec. 31, 2022	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($) state	Sep. 30, 2023 USD ($)	Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items]
Contract liabilities			$ 54,724,000	$ 47,651,000
Restricted cash and cash equivalents			$ 176,309,000	$ 615,950,000	$ 594,865,000
State Farm Term Loan | JPM Credit Facility
Related Party Transaction [Line Items]
Debt face amount					$ 25,000,000
Fixed rate					8.00%
Affiliated Entity | Reinsurance Agreement
Related Party Transaction [Line Items]
Reinsured risk, ceded, percentage			50.00%
Reinsured risk, percentage	100.00%	80.00%	80.00%
Affiliated Entity | State Farm | Alliance Agreement
Related Party Transaction [Line Items]
Related party transaction, transaction term			10 years
Number of states with operations | state				4
Contract liabilities						$ 20,000,000.0
Affiliated Entity | Evanston | Reinsurance Agreement
Related Party Transaction [Line Items]
Restricted cash and cash equivalents			$ 544,900,000	$ 517,200,000

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