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Income and other taxes - Net deferred income tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | $ (75,868) | $ (161,206) | $ (217,153)
Deferred tax assets | 137,524 | 111,614 | 60,065
Deferred tax liabilities | (213,392) | (272,820) | $ (277,218)
Property, plant and equipment (owned) |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (448,533) | (447,077) |
Deferred tax assets | (262,020) | (250,890) |
Deferred tax liabilities | (186,513) | (196,187) |
Right-of-use assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (43,386) | (45,501) |
Deferred tax assets | (35,297) | (26,725) |
Deferred tax liabilities | (8,089) | (18,776) |
Repatriation taxes |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (102,370) | (93,363) |
Deferred tax assets | 0 | 0 |
Deferred tax liabilities | (102,370) | (93,363) |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (15,205) | (10,424) |
Deferred tax assets | 0 | (48) |
Deferred tax liabilities | (15,205) | (10,376) |
Temporary differences including temporary differences with liability balances |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (609,494) | (596,365) |
Deferred tax assets | (297,317) | (277,663) |
Deferred tax liabilities | (312,177) | (318,702) |
Non-capital loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 391,132 | 286,004 |
Deferred tax assets | 339,396 | 286,004 |
Deferred tax liabilities | 51,736 | 0 |
Lease obligations |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 56,894 | 56,802 |
Deferred tax assets | 44,455 | 33,979 |
Deferred tax liabilities | 12,439 | 22,823 |
Share-based compensation |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 14,669 | 3,075 |
Deferred tax assets | 1,758 | 0 |
Deferred tax liabilities | 12,911 | 3,075 |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 70,931 | 89,278 |
Deferred tax assets | 49,232 | 69,294 |
Deferred tax liabilities | 21,699 | 19,984 |
Temporary differences including temporary differences with asset balances |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 533,626 | 435,159 |
Deferred tax assets | 434,841 | 389,277 |
Deferred tax liabilities | $ 98,785 | $ 45,882 |

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