Accumulated other comprehensive loss - Schedule of Before and After Tax Amounts for Comprehensive Income (Loss) Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before reclassifications before tax	$ 428,732	$ (140,210)
Other comprehensive income/(loss) before reclassifications, tax	55,876	(6,646)
Other comprehensive income/(loss) before reclassifications, net of tax	484,608	(146,856)
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	50,550	3,503
Amounts reclassified from accumulated other comprehensive income/(loss) loss, tax	0	0
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	50,550	3,503
Other comprehensive income/(loss) before tax	479,282	(136,707)
Other comprehensive income/(loss), tax	55,876	(6,646)
Other comprehensive income/(loss)	535,158	(143,353)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before reclassifications before tax	3,784	2,395
Other comprehensive income/(loss) before reclassifications, tax	(2,625)	2,241
Other comprehensive income/(loss) before reclassifications, net of tax	1,159	4,636
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	3,788	5,352
Amounts reclassified from accumulated other comprehensive income/(loss) loss, tax	(2,292)	(974)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	1,496	4,378
Other comprehensive income/(loss) before tax	7,572	7,747
Other comprehensive income/(loss), tax	(4,917)	1,267
Other comprehensive income/(loss)	2,655	9,014
Cash flow hedges:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before reclassifications before tax	4,357	(4,329)
Other comprehensive income/(loss) before reclassifications, tax	(871)	1,116
Other comprehensive income/(loss) before reclassifications, net of tax	3,486	(3,213)
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	(1,701)	1,455
Amounts reclassified from accumulated other comprehensive income/(loss) loss, tax	340	(375)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	(1,361)	1,080
Other comprehensive income/(loss) before tax	2,656	(2,874)
Other comprehensive income/(loss), tax	(531)	741
Other comprehensive income/(loss)	2,125	(2,133)
Other comprehensive income/(loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before tax	489,510	(131,834)
Other comprehensive income/(loss), tax	50,428	(4,638)
Other comprehensive income/(loss)	$ 539,938	$ (136,472)

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