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Accumulated other comprehensive loss - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Foreign Currency Items |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive (loss)/income before reclassifications, Before Tax Amount | $ (140,210) | $ 67,411
Other comprehensive (loss)/income before reclassifications, Tax (Expense) Benefit | (6,646) | 1,294
Other comprehensive (loss)/income before reclassifications | (146,856) | 68,705
Amounts reclassified from accumulated other comprehensive income loss before tax | 3,503 | 2,033
Amounts reclassified from accumulated other comprehensive income loss, tax | 0 | 0
Amounts reclassified from accumulated other comprehensive income loss net of tax | 3,503 | 2,033
Other comprehensive income/(loss), Before Tax Amount | (136,707) | 69,444
Other comprehensive income/(loss), Tax (Expense) Benefit | (6,646) | 1,294
Other comprehensive (loss)/income | (143,353) | 70,738
Defined Benefit Pension Items |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive (loss)/income before reclassifications, Before Tax Amount | 2,395 | (21,815)
Other comprehensive (loss)/income before reclassifications, Tax (Expense) Benefit | 2,241 | 5,510
Other comprehensive (loss)/income before reclassifications | 4,636 | (16,305)
Amounts reclassified from accumulated other comprehensive income loss before tax | 5,352 | 10,224
Amounts reclassified from accumulated other comprehensive income loss, tax | (974) | (2,573)
Amounts reclassified from accumulated other comprehensive income loss net of tax | 4,378 | 7,651
Other comprehensive income/(loss), Before Tax Amount | 7,747 | (11,591)
Other comprehensive income/(loss), Tax (Expense) Benefit | 1,267 | 2,937
Other comprehensive (loss)/income | 9,014 | (8,654)
Cash flow hedges: |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive (loss)/income before reclassifications, Before Tax Amount | (4,329) | 9,081
Other comprehensive (loss)/income before reclassifications, Tax (Expense) Benefit | 1,116 | (2,459)
Other comprehensive (loss)/income before reclassifications | (3,213) | 6,622
Amounts reclassified from accumulated other comprehensive income loss before tax | 1,455 | (7,100)
Amounts reclassified from accumulated other comprehensive income loss, tax | (375) | 1,923
Amounts reclassified from accumulated other comprehensive income loss net of tax | 1,080 | (5,177)
Amounts reclassified from accumulated other comprehensive loss to fixed assets, before tax | 0 | 401
Amounts reclassified from accumulated other comprehensive loss to fixed assets, tax | 0 | (109)
Amounts reclassified from accumulated other comprehensive loss to fixed assets, after tax | 0 | 292
Other comprehensive income/(loss), Before Tax Amount | (2,874) | 2,382
Other comprehensive income/(loss), Tax (Expense) Benefit | 741 | (645)
Other comprehensive (loss)/income | (2,133) | 1,737
Other comprehensive (loss)/income |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss), Before Tax Amount | (131,834) | 60,235
Other comprehensive income/(loss), Tax (Expense) Benefit | (4,638) | 3,586
Other comprehensive (loss)/income | $ (136,472) | $ 63,821

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