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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Variable Interest Entity [Line Items]          
Cash funding used to purchase Markel CATCo Funds' interests in Markel CATCo Re         $ 45,100
Additional payments made, net of insurance proceeds, to investors by Markel         $ 101,900
Returned capital from Markel CATCo Re $ 24,900        
Investment in Markel CATCo Re   $ 20,100 $ 20,100    
Percentage of Markel CATCo Re net equity by the Company   23.00% 23.00%    
Prior Year Claims and Claims Adjustment Expense   $ 38,600 $ 167,400 $ 479,800  
Tail risk cover in proposed CATCo transaction   95,000      
Noncontrolling Interests [Member]          
Variable Interest Entity [Line Items]          
Redemption of Markel CATCo Re noncontrolling interests   (62,646) (22,261)    
Market CATCo Re          
Variable Interest Entity [Line Items]          
Prior Year Claims and Claims Adjustment Expense   $ (71,500) $ (89,900)