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Insider Trading Arrangements
 3 Months Ended
Jun. 30, 2023
shares
Trading Arrangements, by Individual  
Rule 10b5-1 Arrangement Adopted true
Non-Rule 10b5-1 Arrangement Adopted false
Rule 10b5-1 Arrangement Terminated false
Non-Rule 10b5-1 Arrangement Terminated false
Steven A. Markel [Member]  
Trading Arrangements, by Individual  
Material Terms of Trading Arrangement On May 31, 2023, Steven A. Markel, Chair of the Board and a Director of the Company, adopted a Rule 10b5-1 trading arrangement that is intended to satisfy the affirmative defense of Rule 10b5-1(c) for the sale of up to 1,398 of the Company's common shares until May 17, 2024 (or the date on which all shares have been sold).
Name Steven A. Markel
Title Chair of the Board and a Director of the Company
Adoption Date May 31, 2023
Termination Date May 17, 2024 (or the date on which all shares have been sold)
Aggregate Available 1,398