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Accumulated other comprehensive loss - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Gains and losses on cash flow hedges:
Defined benefit plan adjustment	$ 1,391	$ (32)
Foreign Currency Items
Gains and losses on cash flow hedges:
Other comprehensive income/(loss) before reclassifications, Before Tax Amount	(72,987)	(75,052)
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit	0	0
Other comprehensive income/(loss) before reclassifications	(72,987)	(75,052)
Other comprehensive income/(loss), Before Tax Amount	(69,240)	(75,052)
Other comprehensive income/(loss), Tax (Expense) Benefit	0	0
Other comprehensive (loss)/income	(69,240)	(75,052)
Foreign Currency Items | Net Income
Gains and losses on cash flow hedges:
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount	3,747	0
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit	0	0
Amounts reclassified from accumulated other comprehensive income/(loss)	3,747	0
Defined Benefit Pension Items
Gains and losses on cash flow hedges:
Other comprehensive income/(loss) before reclassifications, Before Tax Amount	(3,365)	63,559
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit	(106)	(14,414)
Other comprehensive income/(loss) before reclassifications	(3,471)	49,145
Other comprehensive income/(loss), Before Tax Amount	3,629	630,924
Other comprehensive income/(loss), Tax (Expense) Benefit	(3,205)	(159,574)
Other comprehensive (loss)/income	424	471,350
Defined Benefit Pension Items | Net Income
Gains and losses on cash flow hedges:
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount	6,994	567,365
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit	(3,099)	(145,160)
Amounts reclassified from accumulated other comprehensive income/(loss)	3,895	422,205
Gains and Losses on Cash Flow Hedges
Gains and losses on cash flow hedges:
Other comprehensive income/(loss) before reclassifications, Before Tax Amount	4,312	10,249
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit	(1,068)	(2,660)
Other comprehensive income/(loss) before reclassifications	3,244	7,589
Other comprehensive income/(loss), Before Tax Amount	(2,439)	1,498
Other comprehensive income/(loss), Tax (Expense) Benefit	597	(379)
Other comprehensive (loss)/income	(1,842)	1,119
Gains and Losses on Cash Flow Hedges | Fixed assets
Gains and losses on cash flow hedges:
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount	805	(289)
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit	(298)	77
Amounts reclassified from accumulated other comprehensive income/(loss)	507	(212)
Gains and Losses on Cash Flow Hedges | Net Income
Gains and losses on cash flow hedges:
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount	(7,556)	(8,462)
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit	1,963	2,204
Amounts reclassified from accumulated other comprehensive income/(loss)	(5,593)	(6,258)
Accumulated Other Comprehensive Loss
Gains and losses on cash flow hedges:
Other comprehensive income/(loss), Before Tax Amount	(68,050)	557,370
Other comprehensive income/(loss), Tax (Expense) Benefit	(2,608)	(159,953)
Other comprehensive (loss)/income	$ (70,658)	$ 397,417

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