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Premiums and Reinsurance Related Information - Schedule of A.M. Best Financial Strength Rating and Percent of Total Reinsurance Recoverable (Details) - Reinsurance Recoverable Including Reinsurance Premium Paid - Reinsurer Concentration Risk	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	100.00%	100.00%
AM Best, A Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	100.00%	100.00%
Renaissance Reinsurance U.S. Inc | AM Best, A+ Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	29.70%	29.80%
Endurance Assurance Corporation | AM Best, A+ Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	23.80%	24.40%
Markel Global Reinsurance Company | AM Best, A Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	21.70%	24.50%
Ascot Bermuda Limited | AM Best, A Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	9.30%	7.30%
American Family Connect Property and Casualty Insurance Company | AM Best, A Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	6.70%	4.20%
Partner Reinsurance Company of the U.S. | AM Best, A+ Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	5.20%	8.50%
All other reinsurers | AM Best, A Rating
Ceded Credit Risk [Line Items]
Reinsurance recoverables (percent)	3.60%	1.30%

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- Definition

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