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Reserve for Loss and Loss Expense (Tables)
3 Months Ended
Mar. 31, 2023
Insurance Loss Reserves [Abstract]  
Schedule of Roll Forward of Reserve for Loss and Loss Expense
Quarter ended March 31,
($ 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 year580,408 508,299 
Prior years(12,970)(14,063)
Total incurred loss and loss expense567,438 494,236 
Paid loss and loss expense for claims occurring in the:  
Current year91,011 91,292 
Prior years418,194 312,926 
Total paid loss and loss expense509,205 404,218 
Net reserve for loss and loss expense, at end of period4,445,541 4,092,280 
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period653,909 552,111 
Gross reserve for loss and loss expense, at end of period$5,099,450 4,644,391