Retirement Plans (Table)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

	Pension Plan
	Quarter ended March 31,
($ in thousands)	2021		2020
Net Periodic Pension Cost (Benefit):
Interest cost	$	2,148	2,828
Expected return on plan assets	(5,744)		(5,477)
Amortization of unrecognized net actuarial loss	625		704
Total net periodic pension cost (benefit)1	$	(2,971)	(1,945)

1 The 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
	Quarter ended March 31,
	2021		2020
Weighted-Average Expense Assumptions:
Discount rate	2.68	%	3.33	%
Effective interest rate for calculation of interest cost	2.06		2.95
Expected return on plan assets	5.40		5.80