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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | $ 0.0 | $ 0.0 |
Net deferred tax liabilities | (14.0) | (0.7) |
Net deferred tax liabilities | (14.0) | (0.7) | $ (22.6)
Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 397.2 | 577.7 |
Net deferred tax liabilities | (411.2) | (578.4) |
Exploration and evaluation assets |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 283.3 | 442.4 | 307.7
Exploration and evaluation assets | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 283.3 | 442.4 |
Asset retirement obligations |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 52.6 | 0.0 | 2.5
Asset retirement obligations | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 52.6 | 0.0 |
Repurchase option |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 0.0 | 91.5 | 0.0
Repurchase option | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 0.0 | 91.5 |
Other assets | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 61.3 | 43.8 |
Plant and equipment |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Net deferred tax liabilities | (383.1) | (572.8) | $ (355.3)
Plant and equipment | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Net deferred tax liabilities | (383.1) | (572.8) |
Mining duties | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Net deferred tax liabilities | (7.4) | 0.0 |
Other liabilities | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Net deferred tax liabilities | $ (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 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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