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Financial risk management - Metal and input price risk (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Financial risk management [Line Items] |  |
Percentage of changes in differences on commodity price recognised in net earnings and other comprehensive income | 10.00% |
Gold price |  |
Financial risk management [Line Items] |  |
Impact on net loss due to 10 % change in price | $ 62.0 | $ 48.6
Copper price |  |
Financial risk management [Line Items] |  |
Impact on net loss due to 10 % change in price | 17.0 | 11.9
Fuel and electricity price |  |
Financial risk management [Line Items] |  |
Impact on net loss due to 10 % change in price | $ 5.9 | $ 7.5

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