XML 74 R63.htm IDEA: XBRL DOCUMENT v3.23.2
Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
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 in proceeds, to Markel CATCo Funds investors             $ 101,900
Returned capital from Markel CATCo Re $ 24,900            
Investment in Markel CATCo Re   $ 20,100   $ 20,100   $ 20,100  
Percentage of Markel CATCo Re net equity held by the Company   25.00%   25.00%   23.00%  
Tail risk cover in Markel CATCo transaction   $ 142,700   $ 142,700      
Favorable development on prior years' loss reserves       139,208 $ 122,728    
Redemption of Markel CATCo Re noncontrolling interests       (88,997) 0    
Noncontrolling Interests [Member]              
Variable Interest Entity [Line Items]              
Redemption of Markel CATCo Re noncontrolling interests     $ (22,261) (62,646) (22,261)    
Markel CATCo Re              
Variable Interest Entity [Line Items]              
Favorable development on prior years' loss reserves   $ (8,700) $ (28,200) $ (53,500) $ (28,200)