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Derivative instruments - Derivative assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Foreign exchange forward contracts |  |
Derivative instruments [Line Items] |  |
Derivative assets | $ 3.2 | $ 0.4
Derivative (liabilities) | (1.1) |
Fuel hedge swap contracts |  |
Derivative instruments [Line Items] |  |
Derivative assets |  | 0.3
Unsettled provisionally priced concentrate derivatives, and swap contracts |  |
Derivative instruments [Line Items] |  |
Derivative (liabilities) | $ (0.3) | $ (1.8)

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Derivative instruments. + References No definition available. + Details
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- Details
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- Details
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- Details
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