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Accumulated other comprehensive loss - Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gains and losses on cash flow hedges:      
Other comprehensive income/(loss) $ 396,833 $ 58,083 $ (76,728)
Foreign Currency Items      
Gains and losses on cash flow hedges:      
Other comprehensive income/(loss) before reclassifications, Before Tax Amount (75,052) 67,917  
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit 0 (7,581)  
Other comprehensive income/(loss) before reclassifications (75,052) 60,336  
Other comprehensive income/(loss), Before Tax Amount (75,052) 55,551  
Other comprehensive income/(loss), Tax (Expense) Benefit 0 (7,581)  
Other comprehensive income/(loss) (75,052) 47,970  
Foreign Currency Items | Net Income      
Gains and losses on cash flow hedges:      
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount 0 (12,366)  
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit 0 0  
Amounts reclassified from accumulated other comprehensive income/(loss) 0 (12,366)  
Defined Benefit Pension Items      
Gains and losses on cash flow hedges:      
Other comprehensive income/(loss) before reclassifications, Before Tax Amount 63,559 (13,217)  
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit (14,414) 2,737  
Other comprehensive income/(loss) before reclassifications 49,145 (10,480)  
Other comprehensive income/(loss), Before Tax Amount 630,924 16,395  
Other comprehensive income/(loss), Tax (Expense) Benefit (159,574) (4,729)  
Other comprehensive income/(loss) 471,350 11,666  
Defined Benefit Pension Items | Net Income      
Gains and losses on cash flow hedges:      
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount 567,365 29,612  
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit (145,160) (7,466)  
Amounts reclassified from accumulated other comprehensive income/(loss) 422,205 22,146  
Gains and Losses on Cash Flow Hedges      
Gains and losses on cash flow hedges:      
Other comprehensive income/(loss) before reclassifications, Before Tax Amount 10,249 (3,823)  
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit (2,660) 871  
Other comprehensive income/(loss) before reclassifications 7,589 (2,952)  
Other comprehensive income/(loss), Before Tax Amount 1,498 475  
Other comprehensive income/(loss), Tax (Expense) Benefit (379) (150)  
Other comprehensive income/(loss) 1,119 325  
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 (289) (1)  
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit 77 0  
Amounts reclassified from accumulated other comprehensive income/(loss) (212) (1)  
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 (8,462) 4,299  
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit 2,204 (1,021)  
Amounts reclassified from accumulated other comprehensive income/(loss) (6,258) 3,278  
Accumulated Other Comprehensive Loss      
Gains and losses on cash flow hedges:      
Other comprehensive income/(loss), Before Tax Amount 557,370 72,421  
Other comprehensive income/(loss), Tax (Expense) Benefit (159,953) (12,460)  
Other comprehensive income/(loss) $ 397,417 $ 59,961 $ (75,890)