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Reserve for Loss and Loss Expense (Tables)
3 Months Ended
Mar. 31, 2025
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)20252024
Gross reserve for loss and loss expense, at beginning of period$6,589,801 5,336,911 
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period1,022,245 618,601 
Net reserve for loss and loss expense, at beginning of period5,567,556 4,718,310 
Incurred loss and loss expense for claims occurring in the:  
Current year759,992 688,519 
Prior years(13,667)15,773 
Total incurred loss and loss expense746,325 704,292 
Paid loss and loss expense for claims occurring in the:  
Current year105,268 107,719 
Prior years487,152 435,489 
Total paid loss and loss expense592,420 543,208 
Net reserve for loss and loss expense, at end of period5,721,461 4,879,394 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period889,394 622,356 
Gross reserve for loss and loss expense, at end of period$6,610,855 5,501,750