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Income and mining taxes - Additional information (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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INCOME AND MINING TAXES |  |
Unused tax losses for which no deferred tax asset recognised | $ 880.0 | $ 858.0
Other temporary differences |  |
INCOME AND MINING TAXES |  |
Unused tax losses for which no deferred tax asset recognised | 40.3 |
Mining tax |  |
INCOME AND MINING TAXES |  |
Unused tax losses for which no deferred tax asset recognised | 570.0 | $ 573.0
Canada | Unused capital losses |  |
INCOME AND MINING TAXES |  |
Capital loss carry-forwards | $ 26.4 |

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