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Reserve for Loss and Loss Expense (Tables)
6 Months Ended
Jun. 30, 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:

Six Months ended
June 30,
($ 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 year1,535,575 1,442,719 
Prior years34,648 187,121 
Total incurred loss and loss expense1,570,223 1,629,840 
Paid loss and loss expense for claims occurring in the:  
Current year320,366 347,501 
Prior years865,344 753,658 
Total paid loss and loss expense1,185,710 1,101,159 
Net reserve for loss and loss expense, at end of period5,952,069 5,246,991 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period859,087 656,534 
Gross reserve for loss and loss expense, at end of period$6,811,156 5,903,525