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Pensions and other postretirement benefit plans - Schedule of Pension Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Total benefit, net | $ (19,700) | $ (11,400) | $ (8,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net actuarial (gain) loss | 2,575 | (10,205) | (33,135)
Amortization of net actuarial (loss) gain | (779) | (1,014) | 305
Change in prior service cost | 0 | 0 | (3,307)
Amortization of prior service costs | 498 | 500 | 502
(Gain) loss recognized in Other comprehensive income (loss) | 24,621 | (12,275) | (28,830)
Pension benefits |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 860 | 998 | 1,366
Interest cost | 80,834 | 81,500 | 84,449
Expected return on plan assets | (91,689) | (96,726) | (95,358)
Amortization of actuarial loss (gain) | 2,453 | 2,926 | 2,185
Amortization of prior service costs | 71 | 69 | 67
Settlement loss (gain) | (12,105) | 35 | 0
Curtailment | 0 | 119 | 0
Total benefit, net | (19,576) | (11,079) | (7,291)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net actuarial (gain) loss | 3,368 | (9,919) | (33,244)
Amortization of net actuarial (loss) gain | (2,453) | (2,926) | (2,185)
Change in prior service cost | 0 | 0 | 0
Amortization of prior service costs | (71) | (69) | (67)
Settlement gain (loss) | 12,105 | (35) | 0
Equity method investments | 725 | (116) | (610)
Other | 9,497 | (1,405) | 7,415
(Gain) loss recognized in Other comprehensive income (loss) | 23,171 | (14,470) | (28,691)
Postretirement benefits |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 32 | 35 | 40
Interest cost | 2,104 | 2,120 | 2,334
Expected return on plan assets | 0 | 0 | 0
Amortization of actuarial loss (gain) | (1,674) | (1,912) | (2,490)
Amortization of prior service costs | (569) | (569) | (569)
Settlement loss (gain) | 0 | 0 | 0
Curtailment | 0 | 0 | 0
Total benefit, net | (107) | (326) | (685)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net actuarial (gain) loss | (793) | (286) | 109
Amortization of net actuarial (loss) gain | 1,674 | 1,912 | 2,490
Change in prior service cost | 0 | 0 | (3,307)
Amortization of prior service costs | 569 | 569 | 569
Settlement gain (loss) | 0 | 0 | 0
Equity method investments | 0 | 0 | 0
Other | 0 | 0 | 0
(Gain) loss recognized in Other comprehensive income (loss) | $ 1,450 | $ 2,195 | $ (139)

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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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