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Fair value measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | $ 304,000 | $ 308,800
Common Collective |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 13,259 | 12,958
Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 43,059 | 45,931
Fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 235,952 | 242,702
Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 3,493 | 4,175
Real estate funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 480 | 400
Cash and accrued income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 7,757 | 2,634
Assets measured at NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 76,197 | 77,207
Assets measured at NAV | Common Collective |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 13,259 | 12,958
Assets measured at NAV | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Assets measured at NAV | Fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 62,458 | 63,849
Assets measured at NAV | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Assets measured at NAV | Real estate funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 480 | 400
Assets measured at NAV | Cash and accrued income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 7,757 | 2,634
Level 1 | Common Collective |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 1 | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 1 | Fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 1 | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 1 | Real estate funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 1 | Cash and accrued income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 7,757 | 2,634
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 220,046 | 228,959
Level 2 | Common Collective |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 2 | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 43,059 | 45,931
Level 2 | Fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 173,494 | 178,853
Level 2 | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 3,493 | 4,175
Level 2 | Real estate funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 2 | Cash and accrued income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 3 | Common Collective |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 3 | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 3 | Fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 3 | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 3 | Real estate funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Level 3 | Cash and accrued income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total postretirement benefit plan assets | 0 | 0
Net investment hedge | Fair Value, Recurring | Hedge derivatives, net: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 11,919 | (5,073)
Net investment hedge | Fair Value, Recurring | Hedge derivatives, net: | Assets measured at NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Net investment hedge | Fair Value, Recurring | Hedge derivatives, net: | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Net investment hedge | Fair Value, Recurring | Hedge derivatives, net: | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 11,919 | (5,073)
Net investment hedge | Fair Value, Recurring | Hedge derivatives, net: | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Commodity Contracts | Fair Value, Recurring | Hedge derivatives, net: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 652 | (41)
Commodity Contracts | Fair Value, Recurring | Hedge derivatives, net: | Assets measured at NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Commodity Contracts | Fair Value, Recurring | Hedge derivatives, net: | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Commodity Contracts | Fair Value, Recurring | Hedge derivatives, net: | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 652 | (41)
Commodity Contracts | Fair Value, Recurring | Hedge derivatives, net: | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Commodity Contracts | Fair Value, Recurring | Non-hedge derivatives, net: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 387 | (6,770)
Commodity Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Assets measured at NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Commodity Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Commodity Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 387 | (6,770)
Commodity Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Foreign Exchange Contracts | Fair Value, Recurring | Hedge derivatives, net: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | (1,841) | 1,502
Foreign Exchange Contracts | Fair Value, Recurring | Hedge derivatives, net: | Assets measured at NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Foreign Exchange Contracts | Fair Value, Recurring | Hedge derivatives, net: | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Foreign Exchange Contracts | Fair Value, Recurring | Hedge derivatives, net: | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | (1,841) | 1,502
Foreign Exchange Contracts | Fair Value, Recurring | Hedge derivatives, net: | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Foreign Exchange Contracts | Fair Value, Recurring | Non-hedge derivatives, net: |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | (3,081) | (29)
Foreign Exchange Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Assets measured at NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Foreign Exchange Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | 0 | 0
Foreign Exchange Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | (3,081) | (29)
Foreign Exchange Contracts | Fair Value, Recurring | Non-hedge derivatives, net: | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net position of derivative | $ 0 | $ 0

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -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 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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