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Financial risk management - Liquidity risks (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financial Instruments [Abstract] |  |  |
Cash and cash equivalents | $ 932,069,000 | $ 833,841,000 | $ 416,763,000
Carrying amount |  |  |
Lease obligations | 717,101,000 | 722,234,000 | $ 718,505,000
Other long-term liabilities | 193,749,000 | 327,491,000 |
Long-term debt | 2,158,192,000 | 2,363,372,000 |
Cash flow hedges | 60,098,000 | 180,798,000 |
Financial liabilities | 3,624,851,000 | 3,796,464,000 |
Contractual cash flows |  |  |
Cash flow hedges | 67,341,000 | 217,642,000 |
1 year or less |  |  |
Contractual cash flows |  |  |
Cash flow hedges | 3,854,000 | 14,887,000 |
1-3 years |  |  |
Contractual cash flows |  |  |
Cash flow hedges | 24,250,000 | 45,467,000 |
3-5 years |  |  |
Contractual cash flows |  |  |
Cash flow hedges | 21,500,000 | 63,025,000 |
More than 5 years |  |  |
Contractual cash flows |  |  |
Cash flow hedges | 17,737,000 | 94,263,000 |
Liquidity risk |  |  |
Carrying amount |  |  |
Trade and other payables | 648,850,000 |  |
Lease obligations | 717,101,000 |  |
Other long-term liabilities | 28,985,000 |  |
Long-term debt | 2,158,192,000 |  |
Cash flow hedges | 60,098,000 |  |
Financial liabilities | 3,613,226,000 |  |
Contractual cash flows |  |  |
Trade and other payables | 648,850,000 |  |
Lease obligations | 945,835,000 |  |
Other long-term liabilities | 57,747,000 |  |
Long-term debt | 3,178,886,000 |  |
Cash flow hedges | 67,341,000 |  |
Financial liabilities | 4,898,659,000 |  |
Liquidity risk | 1 year or less |  |  |
Contractual cash flows |  |  |
Trade and other payables | 648,850,000 |  |
Lease obligations | 140,413,000 |  |
Other long-term liabilities | 2,200,000 |  |
Long-term debt | 123,706,000 |  |
Cash flow hedges | 3,854,000 |  |
Financial liabilities | 919,023,000 |  |
Liquidity risk | 1-3 years |  |  |
Contractual cash flows |  |  |
Trade and other payables | 0 |  |
Lease obligations | 233,331,000 |  |
Other long-term liabilities | 4,400,000 |  |
Long-term debt | 546,915,000 |  |
Cash flow hedges | 24,250,000 |  |
Financial liabilities | 808,896,000 |  |
Liquidity risk | 3-5 years |  |  |
Contractual cash flows |  |  |
Trade and other payables | 0 |  |
Lease obligations | 186,003,000 |  |
Other long-term liabilities | 4,400,000 |  |
Long-term debt | 221,054,000 |  |
Cash flow hedges | 21,500,000 |  |
Financial liabilities | 432,957,000 |  |
Liquidity risk | More than 5 years |  |  |
Contractual cash flows |  |  |
Trade and other payables | 0 |  |
Lease obligations | 386,088,000 |  |
Other long-term liabilities | 46,747,000 |  |
Long-term debt | 2,287,211,000 |  |
Cash flow hedges | 17,737,000 |  |
Financial liabilities | 2,737,783,000 |  |
Revolving credit facility |  |  |
Disclosure of financial liabilities [line items] |  |  |
Undrawn credit facility | 300,000,000 | 300,000,000 |
Geismar 3 construction facility |  |  |
Disclosure of financial liabilities [line items] |  |  |
Undrawn credit facility | 600,000,000 | 800,000,000 |
Carrying amount |  |  |
Long-term debt | $ 0 | $ 176,335,000 |

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