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Income and mining taxes - Composition of income tax expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Income and mining taxes [Line Items] |  |
Adjustments for current tax of prior periods | $ (0.3) | $ (0.2)
CURRENT INCOME AND MINING TAX EXPENSE | 4.2 | 3.6
Deferred income and mining tax expense | (2.8) | 16.1
Adjustments in respect of prior year | (1.3) | 2.1
Total income tax expense | 1.4 | 19.7
Canada |  |
Income and mining taxes [Line Items] |  |
Current income and mining tax expense | 1.9 | 3.6
Deferred income and mining tax expense | (1.5) | 14.0
Foreign |  |
Income and mining taxes [Line Items] |  |
Current income and mining tax expense | $ 2.6 | $ 0.2

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