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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | $ 0.0 | $ 0.0 |
Deferred income tax liabilities (net) | (0.7) | (22.6) |
Net deferred income tax liabilities | (0.7) | (22.6) | $ (61.2)
Deductible temporary differences for which no deferred tax asset is recognised | 1,826.4 | 1,874.9 |
Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 577.7 | 344.5 |
Deferred income tax liabilities (net) | (578.4) | (367.1) |
Non-capital losses |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets |  | 0.0 | 210.4
Deductible temporary differences for which no deferred tax asset is recognised | 1,099.1 | 1,186.5 |
Exploration and evaluation assets |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 442.4 | 307.7 | 0.0
Deductible temporary differences for which no deferred tax asset is recognised | 338.6 | 380.8 |
Exploration and evaluation assets | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 442.4 | 307.7 |
Asset retirement obligations |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 0.0 | 2.5 | 1.7
Deductible temporary differences for which no deferred tax asset is recognised | 265.3 | 213.3 |
Asset retirement obligations | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 0.0 | 2.5 |
Repurchase Agreements |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 91.5 | 0.0 |
Repurchase Agreements | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 91.5 | 0.0 |
Other assets | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets | 43.8 | 34.3 |
Property, plant and equipment |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities (net) | (572.8) | (355.3) | (281.0)
Property, plant and equipment | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities (net) | (572.8) | (355.3) |
Other liabilities |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities (net) |  | (11.5) | (21.7)
Other liabilities | Before Offset Amount |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax liabilities (net) | (5.6) | (11.8) |
Net capital losses |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 104.4 | 66.2 |
Mining duties |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 18.9 | 15.1 |
Other deductible temporary differences |  |  |
Deferred tax assets and liabilities [abstract] |  |  |
Deferred income tax assets |  | 37.4 | $ 37.2
Deductible temporary differences for which no deferred tax asset is recognised | $ 0.1 | $ 13.0 |

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_e&doctype=Standard -URIDate 2023-03-23 + Details
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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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_o&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_56&doctype=Standard -URIDate 2023-03-23 + Details
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