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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, 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)

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