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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, 2024 | Dec. 31, 2023
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 earnings (loss) due to 10 percent change in price | $ 71.6 | $ (62.0)
Copper price |  |
Financial risk management [Line Items] |  |
Impact on net earnings (loss) due to 10 percent change in price | 21.0 | (17.0)
Fuel and electricity price |  |
Financial risk management [Line Items] |  |
Impact on net earnings (loss) due to 10 percent change in price | $ 5.4 | $ (5.9)

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