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Financial instruments - North american natural gas forward contracts (Details) MMBTU in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) MMBTU | Dec. 31, 2021 USD ($) MMBTU
Accumulated other comprehensive income |  |
Disclosure of financial assets [line items] |  |
Reclassification of hedge gain in cash flow hedge | $ 55,000,000 | $ 12,700,000
North american natural gas forward contract |  |
Disclosure of financial assets [line items] |  |
Hedge ineffectiveness | $ 0 |
North american natural gas forward contract | Cash flow hedges |  |
Disclosure of financial assets [line items] |  |
Hedging instrument, energy (in mmbtu) | MMBTU | 307,900 | 322,880
Notional amount | $ 1,014,264,000 | $ 1,053,917,000
Assets, fair value | 316,008,000 |
Liabilities, fair value |  | (3,986,000)
North american natural gas forward contract | Cash flow hedges | Other current assets |  |
Disclosure of financial assets [line items] |  |
Assets, fair value | 32,768,000 | 5,905,000
North american natural gas forward contract | Cash flow hedges | Other non-current assets |  |
Disclosure of financial assets [line items] |  |
Assets, fair value | 289,979,000 | 50,208,000
North american natural gas forward contract | Cash flow hedges | Other current liabilities |  |
Disclosure of financial assets [line items] |  |
Liabilities, fair value | (317,000) | (3,961,000)
North american natural gas forward contract | Cash flow hedges | Other long-term liabilities |  |
Disclosure of financial assets [line items] |  |
Liabilities, fair value | $ (6,422,000) | $ (56,138,000)
North american natural gas forward contract | Cash flow hedges | Bottom of range |  |
Disclosure of financial assets [line items] |  |
Hedging instrument, daily energy annualized (in mmbtu) | MMBTU | 50 | 50
North american natural gas forward contract | Cash flow hedges | Top of range |  |
Disclosure of financial assets [line items] |  |
Hedging instrument, daily energy annualized (in mmbtu) | MMBTU | 150 | 130

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