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Income and mining taxes - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 761.3 | $ 880.0
Other temporary differences |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 51.7 |
Mining tax |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 403.5 | $ 570.0
Canada | Unused capital losses |  |
Income and mining taxes [Line Items] |  |
Capital loss carry-forwards | $ 35.9 |

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