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Reserve for Loss and Loss Expense (Tables)
3 Months Ended
Mar. 31, 2024
Insurance Loss Reserves [Abstract]  
Schedule of Roll Forward of Reserve for Loss and Loss Expense
The table below provides a roll forward of the reserve for loss and loss expense for beginning and ending reserve balances:

Quarter ended March 31,
($ in thousands)20242023
Gross reserve for loss and loss expense, at beginning of period$5,336,911 5,144,821 
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period618,601 757,513 
Net reserve for loss and loss expense, at beginning of period4,718,310 4,387,308 
Incurred loss and loss expense for claims occurring in the:  
Current year688,519 580,408 
Prior years15,773 (12,970)
Total incurred loss and loss expense704,292 567,438 
Paid loss and loss expense for claims occurring in the:  
Current year107,719 91,011 
Prior years435,489 418,194 
Total paid loss and loss expense543,208 509,205 
Net reserve for loss and loss expense, at end of period4,879,394 4,445,541 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period622,356 653,909 
Gross reserve for loss and loss expense, at end of period$5,501,750 5,099,450