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Retirement Plans (Table)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The following tables provide information about the Pension Plan:

Pension Plan
Quarter ended
September 30,
Nine Months ended
September 30,
($ in thousands)2024202320242023
Net Periodic Pension Cost (Benefit):
Interest cost$3,888 3,867 $11,664 11,599 
Expected return on plan assets(5,382)(5,774)(16,147)(17,319)
Amortization of unrecognized net actuarial loss955 750 2,865 2,251 
Total net periodic pension cost (benefit)1
$(539)(1,157)$(1,618)(3,469)
1The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.
Schedule of Weighted-Average Expense Assumptions
Pension Plan
Nine Months ended
September 30,
20242023
Weighted-Average Expense Assumptions:
Discount rate5.02 %5.21 %
Effective interest rate for calculation of interest cost4.91 5.09 
Expected return on plan assets6.40 6.90