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Pensions and other postretirement benefit plans (Tables)
3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Retirement Plan Costs
Retirement plan costs include the following components:
Pension benefits
Postretirement benefits
Three months ended March 31,Three months ended March 31,
In thousands2025202420252024
Operating expenses:
Service cost - benefits earned during the period$248 $289 $$
Non-operating expenses:
Interest cost on benefit obligations20,387 20,315 526 530 
Expected return on plan assets(22,860)(24,103)— — 
Amortization of prior service cost (benefit)17 17 (142)(142)
Amortization of actuarial cost (benefit)577 715 (419)(478)
Total non-operating benefit$(1,879)$(3,056)$(35)$(90)
Total benefit for retirement plans$(1,631)$(2,767)$(27)$(81)