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Fair value measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
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

X

- 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.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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