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Financial instruments - Financial assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 1,511,961	$ 1,130,036
Financial liabilities	3,727,171	3,805,825
Trade, other payables and accrued liabilities, excluding tax payable | Financial liabilities not measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	429,737	672,237
Lease obligations, including current portion | Financial liabilities not measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	818,205	872,120
Long-term debt, including current portion | Financial liabilities not measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	2,414,935	2,141,801
Land mortgage | Financial liabilities not measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	27,483	28,014
Cash flow hedges | Derivative instruments designated as cash flow hedges | Financial liabilities measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	36,811	91,653
Derivative instruments designated as cash flow hedges | Financial assets measured at fair value: | Cash flow hedges
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	128,414	121,108
Fair value of Egypt gas supply contract derivative | Financial assets measured at fair value: | Cash flow hedges
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	14,341	20,402
Fair value of New Zealand gas supply contract derivative | Financial assets measured at fair value: | Cash flow hedges
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	8,713	0
Cash and cash equivalents | Financial assets not measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	891,910	458,015
Trade and other receivables, excluding tax receivable | Financial assets not measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	454,278	514,739
Restricted cash included in other assets | Financial assets not measured at fair value:
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 14,305	$ 15,772

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- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities]

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- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]]

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