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Stockholders' Equity - Schedule of Other Ownership Interests (Details) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Jul. 31, 2024
THG units held by Hagerty, Inc. |  |  |
Class of Stock [Roll Forward] |  |  |
Beginning balance (in shares) | 345,210,737 |  |
Ending balance (in shares) | 346,127,687 | 345,210,737 |
Beginning of period | 26.10% | 24.90% |
End of period | 29.10% | 26.10% |
Common stock, shares, issued (in shares) | 346,127,687 | 345,210,737 |
THG units held by other unit holders |  |  |
Class of Stock [Roll Forward] |  |  |
Beginning balance (in shares) | 255,178,346 | 255,499,164 |
Ending balance (in shares) | 245,420,794 | 255,178,346 |
Beginning of period | 73.90% | 75.10% |
End of period | 70.90% | 73.90% |
Class A Common Stock |  |  |
Class of Stock [Roll Forward] |  |  |
Beginning balance (in shares) | 90,032,391 |  |
Ending balance (in shares) | 100,706,893 | 90,032,391 |
Common stock, shares, issued (in shares) | 100,706,893 | 90,032,391 | 3,876,201
Class A Common Stock | THG units held by Hagerty, Inc. |  |  |
Class of Stock [Roll Forward] |  |  |
Beginning balance (in shares) | 90,032,391 | 84,588,536 |
Issuance of shares under employee plans (in shares) | 916,950 | 1,246,836 |
Exchange of THG units for Class A Common Stock (in shares) | (9,757,552) | (320,818) |
Warrant exchange (in Shares) | 0 | 3,876,201 |
Ending balance (in shares) | 100,706,893 | 90,032,391 |
Class A Common Stock | THG units held by other unit holders |  |  |
Class of Stock [Roll Forward] |  |  |
Exchange of THG units for Class A Common Stock (in shares) | (9,757,552) | (320,818) |

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