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Pensions and other postretirement benefit plans (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Retirement Plan Costs
Retirement plan costs include the following components:
Pension benefits
Postretirement benefits
Three months ended June 30,Three months ended June 30,
In thousands2025202420252024
Operating expenses:
Service cost - benefits earned during the period$248 $289 $8 $8 
Non-operating expenses:
Interest cost on benefit obligations20,837 20,276 526 530 
Expected return on plan assets(23,444)(24,050)— — 
Amortization of prior service cost (benefit)18 17 (142)(142)
Amortization of actuarial cost (benefit)620 710 (418)(478)
Total non-operating benefit$(1,969)$(3,047)$(34)$(90)
Total benefit for retirement plans$(1,721)$(2,758)$(26)$(82)
Pension benefits
Postretirement benefits
Six months ended June 30,Six months ended June 30,
In thousands2025202420252024
Operating expenses:
Service cost - benefits earned during the period$496 $578 $16 $17 
Non-operating expenses:
Interest cost on benefit obligations41,224 40,591 1,052 1,060 
Expected return on plan assets(46,304)(48,153)— — 
Amortization of prior service cost (benefit)35 34 (284)(284)
Amortization of actuarial cost (benefit)1,197 1,425 (837)(956)
Total non-operating benefit$(3,848)$(6,103)$(69)$(180)
Total benefit for retirement plans$(3,352)$(5,525)$(53)$(163)