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Pensions and other postretirement benefit plans (Tables) | 6 Months Ended
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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 thousands | 2025 |  | 2024 |  | 2025 |  | 2024
Operating expenses: |  |  |  |  |  |  |
Service cost - benefits earned during the period | $ | 248 |  |  | $ | 289 |  |  | $ | 8 |  |  | $ | 8 |
Non-operating expenses: |  |  |  |  |  |  |
Interest cost on benefit obligations | 20,837 |  |  | 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 thousands | 2025 |  | 2024 |  | 2025 |  | 2024
Operating expenses: |  |  |  |  |  |  |
Service cost - benefits earned during the period | $ | 496 |  |  | $ | 578 |  |  | $ | 16 |  |  | $ | 17 |
Non-operating expenses: |  |  |  |  |  |  |
Interest cost on benefit obligations | 41,224 |  |  | 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) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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