Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan were as follows:

	Three Months Ended Mar 31,
($ in thousands)	2025		2024
RAP
Service cost	$	810	$	874
Interest cost	2,814		2,719
Expected return on plan assets	(9,809)		(8,650)
Amortization of prior service cost	(44)		(53)
Total net periodic pension cost	$	(6,230)	$	(5,111)
Postretirement Plan
Interest cost	$	26	$	18
Amortization of prior service cost	(19)		(19)
Amortization of actuarial loss (gain)	4		(7)
Total net periodic benefit cost	$	12	$	(8)