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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
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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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