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Related-Party Transactions - Equity Interests in Hagerty (Details) - Hagerty, Inc. - Affiliated Entity
Sep. 30, 2024
shares
Markel | Total Stockholders' Equity  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 3,108,000
Percentage of total outstanding 3.50%
Markel | Non-controlling Interest  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 75,000,000
Percentage of total outstanding 29.40%
Markel | THG units  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 75,000,000
Percentage of total outstanding 21.70%
State Farm | Total Stockholders' Equity  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 51,800,000
Percentage of total outstanding 57.60%
State Farm | Non-controlling Interest  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 0
Percentage of total outstanding 0.00%
State Farm | THG units  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 0
Percentage of total outstanding 0.00%
Class A Common Stock | Markel  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 3,108,000
Percentage of total outstanding 3.50%
Class A Common Stock | State Farm  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 51,800,000
Percentage of total outstanding 57.60%
Class V Common Stock | Markel  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 75,000,000
Percentage of total outstanding 29.90%
Class V Common Stock | State Farm  
Class of Stock [Line Items]  
Equity interests in Hagerty (in shares) 0
Percentage of total outstanding 0.00%
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%
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%