Retirement Plans (Table)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

	Pension Plan			Pension Plan
	Quarter ended June 30,			Six Months ended June 30,
($ in thousands)	2021		2020	2021		2020
Net Periodic Pension Cost (Benefit):
Interest cost	$	2,149	2,828	$	4,297	5,656
Expected return on plan assets	(5,744)		(5,476)	(11,488)		(10,953)
Amortization of unrecognized net actuarial loss	625		704	1,250		1,408
Total net periodic pension cost (benefit)1	$	(2,970)	(1,944)	$	(5,941)	(3,889)

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
	Six Months ended June 30,
	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