Pensions and other postretirement benefit plans (Tables)

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)

Retirement plan costs include the following components:

	Pension benefits				Postretirement benefits
	Three months ended June 30,				Three months ended June 30,
In thousands	2023		2022		2023		2022
Operating expenses:
Service cost - benefits earned during the period	$	346	$	434	$	10	$	23
Non-operating expenses:
Interest cost on benefit obligation	20,894		18,132		632		434
Expected return on plan assets	(23,814)		(36,509)		—		—
Amortization of prior service benefit	17		—		—		—
Amortization of actuarial loss (gain)	544		25		(536)		(242)
Total non-operating (benefit) expenses	$	(2,359)	$	(18,352)	$	96	$	192
Total expense (benefit) for retirement plans	$	(2,013)	$	(17,918)	$	106	$	215

	Pension benefits				Postretirement benefits
	Six months ended June 30,				Six months ended June 30,
In thousands	2023		2022		2023		2022
Operating expenses:
Service cost - benefits earned during the period	$	670	$	909	$	20	$	38
Non-operating expenses:
Interest cost on benefit obligations	42,095		36,781		1,264		885
Expected return on plan assets	(47,482)		(73,790)		—		—
Amortization of prior service benefit	33		—		—		—
Amortization of actuarial loss (gain)	1,084		45		(1,072)		(294)
Total non-operating (benefit) expense	$	(4,270)	$	(36,964)	$	192	$	591
Total (benefit) expense for retirement plans	$	(3,600)	$	(36,055)	$	212	$	629