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Financial instruments - North american natural gas forward contracts (Details) MMBTU in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) MMBTU | Dec. 31, 2022 USD ($) MMBTU
Accumulated other comprehensive income |  |
Disclosure of financial assets [line items] |  |
Reclassification of hedge gain (loss) in cash flow hedge | $ (22,500,000) | $ 55,000,000
North american natural gas forward contract |  |
Disclosure of financial assets [line items] |  |
Hedge ineffectiveness | $ 0 | $ 0
North american natural gas forward contract | Cash flow hedges |  |
Disclosure of financial assets [line items] |  |
Hedging instrument, energy (in mmbtu) | MMBTU | 347,190 | 307,900
Notional amount | $ 1,183,319,000 | $ 1,014,264,000
Assets, fair value | 29,925,000 | 316,008,000
North american natural gas forward contract | Cash flow hedges | Other current assets |  |
Disclosure of financial assets [line items] |  |
Assets, fair value | 470,000 | 32,768,000
North american natural gas forward contract | Cash flow hedges | Other non-current assets |  |
Disclosure of financial assets [line items] |  |
Assets, fair value | 120,638,000 | 289,979,000
North american natural gas forward contract | Cash flow hedges | Other current liabilities |  |
Disclosure of financial assets [line items] |  |
Liabilities, fair value | (60,532,000) | (317,000)
North american natural gas forward contract | Cash flow hedges | Other long-term liabilities |  |
Disclosure of financial assets [line items] |  |
Liabilities, fair value | $ (30,651,000) | $ (6,422,000)
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 | 170 | 150

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