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Variable Interest Entities (Markel CATCo Re Balance Sheet) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 3,627,142 $ 3,747,060    
Restricted cash and cash equivalents 649,598 584,974    
Total Assets 57,286,385 55,045,710    
Unpaid losses and loss adjustment expenses 24,144,955 23,483,321 $ 21,306,793 $ 20,947,898
Other liabilities 3,959,161 3,927,498    
Total Liabilities 40,968,869 39,519,817    
Shareholders' equity 15,729,719 14,983,928    
Noncontrolling interests 87,804 72,280    
Total Equity 15,817,523 15,056,208    
Total Liabilities and Equity 57,286,385 55,045,710    
Markel CATCo Re        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 96,252 91,301    
Restricted cash and cash equivalents 169,280 173,800    
Other assets and receivables due from cedents 18,742 19,292    
Total Assets 284,274 284,393    
Unpaid losses and loss adjustment expenses 168,630 184,967    
Other liabilities 2,380 1,842    
Total Liabilities 171,010 186,809    
Shareholders' equity 21,139 21,139    
Noncontrolling interests 92,125 76,445    
Total Equity 113,264 97,584    
Total Liabilities and Equity $ 284,274 $ 284,393