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Income and mining taxes - Deferred income tax losses and deductible temporary differences that were not recorded (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Income and mining taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 847.7 | $ 1,072.2
Non-capital losses (expiring 2042-2044) |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 143.7 | 23.0
Capital losses |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 23.0 | 9.8
Mining interests |  |
Income and mining taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 181.3 | 92.3
Tax credits |  |
Income and mining taxes [Line Items] |  |
Unused tax credits for which no deferred tax asset recognised | 45.0 | 44.9
Asset retirement obligations |  |
Income and mining taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 119.3 | 124.2
Derivative and other financial liabilities |  |
Income and mining taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 288.5 | 708.2
Deferred mining taxes |  |
Income and mining taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 46.9 | 69.8
BRITISH COLUMBIA | Mining tax deduction |  |
Income and mining taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 34.3 | 32.9
ONTARIO | Mining tax deduction |  |
Income and mining taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 193.6 | $ 362.4

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