Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2024

Retirement Benefits [Abstract]

Net period benefit cost for the pension and postretirement plans

The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan for the three and six months ended June 30, 2024 and 2023 were as follows:

	Three Months Ended Jun 30,				Six Months Ended Jun 30,
($ in thousands)	2024		2023		2024		2023
RAP
Service cost	$	881	$	796	$	1,755	$	1,592
Interest cost	2,719		2,686		5,438		5,372
Expected return on plan assets	(8,650)		(8,202)		(17,301)		(16,404)
Amortization of prior service cost	(54)		(63)		(107)		(125)
Amortization of actuarial loss	—		—		—		37
Total net periodic pension cost	$	(5,104)	$	(4,783)	$	(10,215)	$	(9,528)
Postretirement Plan
Interest cost	$	18	$	20	$	37	$	39
Amortization of prior service cost	(19)		(19)		(38)		(38)
Amortization of actuarial (gain)	(7)		(7)		(14)		(15)
Total net periodic benefit cost	$	(8)	$	(7)	$	(15)	$	(13)