Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Stockholders' Equity - Schedule of Exchanges of THG Units (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Class A Common Stock
Class of Stock [Line Items]
Total THG units exchanged (in shares)	18,498,911	9,484,250	18,923,313	9,562,552
Class V Common Stock
Class of Stock [Line Items]
Shares of Class V Common Stock cancelled	18,473,911	9,481,750	18,473,911	9,481,750
HHC \| Class A Common Stock
Class of Stock [Line Items]
Total THG units exchanged (in shares)	10,637,500	9,481,750	10,637,500	9,481,750
Markel \| Class A Common Stock
Class of Stock [Line Items]
Total THG units exchanged (in shares)	7,836,411	0	7,836,411	0
Other \| Class A Common Stock
Class of Stock [Line Items]
Total THG units exchanged (in shares)	25,000	2,500	449,402	80,802