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Pensions and other postretirement benefit plans - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Non-operating expenses: |  |  |  |
Total non-operating benefit | $ (3,193) | $ (2,929) | $ (9,476) | $ (7,007)
Pension benefits |  |  |  |
Operating expenses: |  |  |  |
Service cost - benefits earned during the period | 288 | 335 | 866 | 1,005
Non-operating expenses: |  |  |  |
Interest cost on benefit obligations | 20,501 | 21,248 | 61,092 | 63,343
Expected return on plan assets | (24,356) | (24,015) | (72,509) | (71,497)
Amortization of prior service cost (benefit) | 18 | 18 | 52 | 51
Amortization of actuarial cost (benefit) | 735 | 556 | 2,160 | 1,640
Total non-operating benefit | (3,102) | (2,193) | (9,205) | (6,463)
Total benefit for retirement plans | (2,814) | (1,858) | (8,339) | (5,458)
Postretirement benefits |  |  |  |
Operating expenses: |  |  |  |
Service cost - benefits earned during the period | 9 | 10 | 26 | 30
Non-operating expenses: |  |  |  |
Interest cost on benefit obligations | 530 | 486 | 1,590 | 1,750
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost (benefit) | (143) | (427) | (427) | (427)
Amortization of actuarial cost (benefit) | (478) | (795) | (1,434) | (1,867)
Total non-operating benefit | (91) | (736) | (271) | (544)
Total benefit for retirement plans | $ (82) | $ (726) | $ (245) | $ (514)

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- Definition Defined Benefit Plans and Other Postretirement Benefit Plans, Non-Operating Expenses [Abstract] + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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