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Income and mining taxes - Deferred income tax assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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DEFERRED TAX ASSETS |  |
Deferred income tax asset (in respect of Ontario mining tax, net) | $ 8.7 | $ 4.9
DEFERRED TAX LIABILITIES |  |
Deferred income tax liabilities, net | 55.6 | 74.8
CANADA |  |
DEFERRED TAX ASSETS |  |
Deferred income tax asset (in respect of Ontario mining tax, net) | 8.7 | 5.0
DEFERRED TAX LIABILITIES |  |
Deferred income tax liabilities, net | 55.6 | 74.8
CANADA | Mining interests |  |
DEFERRED TAX ASSETS |  |
Deferred income tax asset (in respect of Ontario mining tax, net) | 1.7 | 0.0
DEFERRED TAX LIABILITIES |  |
Deferred income tax liabilities, net | 74.9 | 98.3
CANADA | Derivative financial liabilities |  |
DEFERRED TAX ASSETS |  |
Deferred income tax asset (in respect of Ontario mining tax, net) | 9.2 | 6.5
CANADA | Inventory and other |  |
DEFERRED TAX ASSETS |  |
Deferred income tax asset (in respect of Ontario mining tax, net) | 2.2 | 1.5
DEFERRED TAX LIABILITIES |  |
Deferred income tax liabilities, net | 8.1 | 4.2
CANADA | Mining tax credits carry-forward |  |
DEFERRED TAX LIABILITIES |  |
Deferred income tax liabilities, net | $ 27.4 | $ 27.7

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_o&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_56&doctype=Standard -URIDate 2024-03-27 + Details
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