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Related-Party Transactions - Schedule of Equity Interests in Hagerty (Details) - Hagerty, Inc. - shares | Dec. 31, 2025 | Dec. 31, 2023
--- | --- | ---
Class of Stock [Line Items] |  |
Percentage of total outstanding |  | 5.00%
Affiliated Entity | Markel |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 75,000,000 |
Percentage of total outstanding | 30.60% |
Affiliated Entity | Markel | Total Stockholders' Equity |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 3,108,000 |
Percentage of total outstanding | 3.10% |
Affiliated Entity | Markel | THG units |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 75,000,000 |
Percentage of total outstanding | 21.70% |
Affiliated Entity | State Farm |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 0 |
Percentage of total outstanding | 0.00% |
Affiliated Entity | State Farm | Total Stockholders' Equity |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 51,800,000 |
Percentage of total outstanding | 51.40% |
Affiliated Entity | State Farm | THG units |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 0 |
Percentage of total outstanding | 0.00% |
Affiliated Entity | Class A Common Stock | Markel |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 3,108,000 |
Percentage of total outstanding | 3.10% |
Affiliated Entity | Class A Common Stock | State Farm |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 51,800,000 |
Percentage of total outstanding | 51.40% |
Affiliated Entity | Class V Common Stock | Markel |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 75,000,000 |
Percentage of total outstanding | 31.00% |
Affiliated Entity | Class V Common Stock | State Farm |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 0 |
Percentage of total outstanding | 0.00% |
Affiliated Entity | Series A Convertible Preferred Stock | Markel |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 1,590,668 |
Percentage of total outstanding | 18.80% |
Affiliated Entity | Series A Convertible Preferred Stock | State Farm |  |
Class of Stock [Line Items] |  |
Equity interests in Hagerty (in shares) | 5,302,226 |
Percentage of total outstanding | 62.50% |

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