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Income and mining taxes - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 1,033.7 | $ 761.3
Mining tax |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 362.4 | $ 403.5
Canada |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 23.0 |
MEXICO |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 74.5 |

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