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Derivative instruments - Impact of movements in market commodity prices (Details) oz in Millions, lb in Millions | Dec. 31, 2023 lb oz | Dec. 31, 2022 lb oz
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Financial Instruments [Abstract] |  |
Gold ounces | oz | (0.1) | 0.5
Copper pounds | lb | (0.1) | 1.4

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- Definition Financial Instruments [Abstract] + References No definition available. + Details
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- Definition The volume of copper subject to final pricing net of outstanding swaps. + References No definition available. + Details
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- Definition The volume of gold subject to final pricing net of outstanding swaps. + References No definition available. + Details
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