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INCOME TAXES - Deferred Tax Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | $ 0.0 |
Deferred tax liabilities opening balance | (0.7) |
Net deferred income tax liabilities opening balance | (0.7) | $ (22.6)
Statements of earnings (loss) | (13.0) | 21.2
OCI | (0.3) | 0.7
Deferred tax assets ending balance | 0.0 | 0.0
Deferred tax liabilities ending balance | (14.0) | (0.7)
Net deferred income tax liabilities ending balance | (14.0) | (0.7)
Exploration and evaluation assets |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 442.4 | 307.7
Statements of earnings (loss) | (159.1) | 134.7
OCI | 0.0 | 0.0
Deferred tax assets ending balance | 283.3 | 442.4
Asset retirement obligations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 0.0 | 2.5
Statements of earnings (loss) | 52.6 | (2.5)
OCI | 0.0 | 0.0
Deferred tax assets ending balance | 52.6 | 0.0
Repurchase option |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 91.5 | 0.0
Statements of earnings (loss) | (91.5) | 91.5
OCI | 0.0 | 0.0
Deferred tax assets ending balance | 0.0 | 91.5
Other assets |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 43.8 | 34.3
Statements of earnings (loss) | 17.6 | 8.8
OCI | (0.1) | 0.7
Deferred tax assets ending balance | 61.3 | 43.8
Plant and equipment |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | (572.8) | (355.3)
Statements of earnings (loss) | 189.7 | (217.5)
OCI | 0.0 | 0.0
Deferred tax liabilities ending balance | (383.1) | (572.8)
Mining duties |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | 0.0 |
Statements of earnings (loss) | (7.4) |
OCI | 0.0 |
Deferred tax liabilities ending balance | (7.4) | 0.0
Other liabilities |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | (5.6) | (11.8)
Statements of earnings (loss) | (14.9) | 6.2
OCI | (0.2) | 0.0
Deferred tax liabilities ending balance | $ (20.7) | $ (5.6)

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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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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [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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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + 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 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_90&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2024-03-27 + Details
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