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Reserve for Loss and Loss Expense (Tables)
9 Months Ended
Sep. 30, 2023
Insurance Loss Reserves [Abstract]  
Schedule of Roll Forward of Reserve for Loss and Loss Expense
Nine Months ended September 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 year1,865,247 1,610,940 
Prior years(5,782)(44,010)
Total incurred loss and loss expense1,859,465 1,566,930 
Paid loss and loss expense for claims occurring in the:  
Current year607,595 513,118 
Prior years988,859 779,438 
Total paid loss and loss expense1,596,454 1,292,556 
Net reserve for loss and loss expense, at end of period4,650,319 4,276,636 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period651,051 688,641 
Gross reserve for loss and loss expense, at end of period$5,301,370 4,965,277