Pensions and other postretirement benefit plans (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Schedule of retirement plan costs

Retirement plan costs include the following components:

	Pension benefits				Postretirement benefits
	Three months ended September 30,				Three months ended September 30,
In thousands	2022		2021		2022		2021
Operating expenses:
Service cost - benefits earned during the period	$	448	$	490	$	19	$	23
Non-operating expenses:
Interest cost on benefit obligation	17,715		17,042		442		428
Expected return on plan assets	(32,316)		(41,355)		—		—
Amortization of actuarial loss (gain)	22		38		(147)		(13)
Pension settlement gain	(706)		—		n/a		n/a
Total non-operating (benefit) expenses	$	(15,285)	$	(24,275)	$	295	$	415
Total expense (benefit) for retirement plans	$	(14,837)	$	(23,785)	$	314	$	438

	Pension benefits				Postretirement benefits
	Nine months ended September 30,				Nine months ended September 30,
In thousands	2022		2021		2022		2021
Operating expenses:
Service cost - benefits earned during the period	$	1,357	$	1,470	$	57	$	67
Non-operating expenses:
Interest cost on benefit obligation	54,496		51,179		1,327		1,330
Expected return on plan assets	(106,106)		(124,193)		—		—
Amortization of actuarial loss (gain)	67		115		(441)		(75)
Pension settlement gain	(706)		—		n/a		n/a
Total non-operating (benefit) expenses	$	(52,249)	$	(72,899)	$	886	$	1,255
Total expense (benefit) for retirement plans	$	(50,892)	$	(71,429)	$	943	$	1,322