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Related-Party Transactions - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2023 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | $ 138,823 | $ 128,061 | $ 615,950 |
Contract liabilities |  | 46,450 | 47,239 |  |
State Farm Term Loan | 2025 JPM Credit Facility |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fixed rate (as a percent) |  |  |  |  | 8.00%
State Farm Term Loan | 2025 JPM Credit Facility | Hagerty Reinsurance Ltd |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Debt face amount |  | $ 24,500 |  |  | $ 25,000
Reinsurance Agreement | Affiliated Entity |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Reinsured risk, percentage | 100.00% | 80.00% |  |  |
Reinsured risk, ceded, percentage |  | 50.00% |  |  |
Reinsurance Agreement | Affiliated Entity | Evanston |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | $ 680,400 | $ 589,200 |  |
Alliance Agreement | Affiliated Entity | State Farm |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, transaction term (in year) |  | 10 years |  |  |
Contract liabilities |  | $ 20,000 |  |  |

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