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Stockholders' Equity - Ownership (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Class of Stock [Roll Forward] |  |  |  |
Ending balance (in shares) | 345,158,709 | 339,978,229 | 345,158,709 | 339,978,229
Non-controlling Interest |  |  |  |
Class of Stock [Roll Forward] |  |  |  |
Beginning balance (in shares) | 255,367,640 | 255,499,164 | 255,499,164 | 255,758,466
Ending balance (in shares) | 255,178,346 | 255,499,164 | 255,178,346 | 255,499,164
The Hagerty Group, LLC |  |  |  |
Class of Stock [Roll Forward] |  |  |  |
Beginning of period | 25.10% | 24.80% | 24.90% | 24.50%
End of period | 26.10% | 24.80% | 26.10% | 24.80%
Beginning of period | 74.90% | 75.20% | 75.10% | 75.50%
End of period | 73.90% | 75.20% | 73.90% | 75.20%
Class A Common Stock |  |  |  |
Class of Stock [Roll Forward] |  |  |  |
Beginning balance (in shares) | 85,703,286 | 84,405,625 | 84,588,536 | 83,202,969
Issuance of shares under employee plans (in shares) | 211,582 | 73,440 | 1,194,808 | 1,016,794
Exchange of THG units for Class A Common Stock (in shares) | 189,294 | 0 | 320,818 | 259,302
Warrant exchange (in shares) | 3,876,201 | 0 | 3,876,201 | 0
Ending balance (in shares) | 89,980,363 | 84,479,065 | 89,980,363 | 84,479,065
Class A Common Stock | Non-controlling Interest |  |  |  |
Class of Stock [Roll Forward] |  |  |  |
Exchange of THG units for Class A Common Stock (in shares) | (189,294) | 0 | (320,818) | (259,302)

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