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Income and other taxes - Net deferred income tax liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | $ (161,206) | $ (217,153) | $ (221,682) | $ (164,091)
Deferred tax assets | 111,614 | 60,065 | 59,532 | 102,341
Deferred tax liabilities | (272,820) | (277,218) | (281,214) | $ (266,432)
Property, plant and equipment (owned) |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | (447,077) | (425,743) | (425,743) |
Deferred tax assets | (250,890) | (212,087) | (212,087) |
Deferred tax liabilities | (196,187) | (213,656) | (213,656) |
Right-of-use assets |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | (45,501) | (53,400) | 0 |
Deferred tax assets | (26,725) | (39,600) | 0 |
Deferred tax liabilities | (18,776) | (13,800) | 0 |
Repatriation taxes |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | (93,363) | (94,446) | (94,446) |
Deferred tax assets | 0 | 0 | 0 |
Deferred tax liabilities | (93,363) | (94,446) | (94,446) |
Other |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | (10,424) | (14,930) | (14,930) |
Deferred tax assets | (48) | (6,700) | (6,700) |
Deferred tax liabilities | (10,376) | (8,230) | (8,230) |
Temporary differences including temporary differences with liability balances |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | (596,365) | (588,519) | (535,119) |
Deferred tax assets | (277,663) | (258,387) | (218,787) |
Deferred tax liabilities | (318,702) | (330,132) | (316,332) |
Non-capital loss carryforwards |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | 286,004 | 233,237 | 233,237 |
Deferred tax assets | 286,004 | 233,237 | 233,237 |
Deferred tax liabilities | 0 | 0 | 0 |
Lease obligations |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | 56,802 | 63,415 | 0 |
Deferred tax assets | 33,979 | 45,239 | 0 |
Deferred tax liabilities | 22,823 | 18,176 | 0 |
Share-based compensation |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | 3,075 | 10,908 | 10,908 |
Deferred tax assets | 0 | 1,170 | 1,170 |
Deferred tax liabilities | 3,075 | 9,738 | 9,738 |
Other |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | 89,278 | 63,806 | 69,292 |
Deferred tax assets | 69,294 | 38,806 | 43,912 |
Deferred tax liabilities | 19,984 | 25,000 | 25,380 |
Temporary differences including temporary differences with asset balances |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net | 435,159 | 371,366 | 313,437 |
Deferred tax assets | 389,277 | 318,452 | 278,319 |
Deferred tax liabilities | $ 45,882 | $ 52,914 | $ 35,118 |

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