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Reserve for Loss and Loss Expense (Tables)
9 Months Ended
Sep. 30, 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:

Nine Months ended
September 30,
($ 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 year2,212,750 1,865,247 
Prior years182,748 (5,782)
Total incurred loss and loss expense2,395,498 1,859,465 
Paid loss and loss expense for claims occurring in the:  
Current year638,494 607,595 
Prior years1,053,299 988,859 
Total paid loss and loss expense1,691,793 1,596,454 
Net reserve for loss and loss expense, at end of period5,422,015 4,650,319 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period1,029,981 651,051 
Gross reserve for loss and loss expense, at end of period$6,451,996 5,301,370