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Reserve for Loss and Loss Expense (Tables)
6 Months Ended
Jun. 30, 2023
Insurance Loss Reserves [Abstract]  
Schedule of Roll Forward of Reserve for Loss and Loss Expense
Six Months ended June 30,
($ in thousands)20232022
Gross reserve for loss and loss expense, at beginning of period$5,144,821 4,580,903 
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period757,513 578,641 
Net reserve for loss and loss expense, at beginning of period4,387,308 4,002,262 
Incurred loss and loss expense for claims occurring in the:  
Current year1,221,635 1,041,778 
Prior years(8,067)(22,674)
Total incurred loss and loss expense1,213,568 1,019,104 
Paid loss and loss expense for claims occurring in the:  
Current year320,026 272,401 
Prior years720,314 570,868 
Total paid loss and loss expense1,040,340 843,269 
Net reserve for loss and loss expense, at end of period4,560,536 4,178,097 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period616,487 544,082 
Gross reserve for loss and loss expense, at end of period$5,177,023 4,722,179