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EXPLORATION AND EVALUATION ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | $ 2,598.0 |
Exploration and evaluation expenditures | 26.3 | $ 28.4
Balance, end of the year | 3,496.5 | 2,598.0
Exploration and evaluation assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 28.3 | 61.7
Reclassification to assets held for sale |  | (34.1)
Transfers within property, plant and equipment | (11.1) |
Impairment charge | (1.3) | (1.2)
Transfers from exploration & evaluation assets | (1.5) | 0.0
Exploration and evaluation expenditures |  | 1.9
Balance, end of the year | 14.4 | 28.3
Exploration and evaluation assets | Diakha-Siribaya Gold project |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 0.0 | 36.6
Reclassification to assets held for sale |  | (34.1)
Transfers within property, plant and equipment | 0.0 |
Impairment charge | 0.0 | (1.2)
Transfers from exploration & evaluation assets | 0.0 | (1.3)
Exploration and evaluation expenditures |  | 0.0
Balance, end of the year | 0.0 | 0.0
Exploration and evaluation assets | Fayolle property |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 11.1 | 9.2
Reclassification to assets held for sale |  | 0.0
Transfers within property, plant and equipment | (11.1) |
Impairment charge | 0.0 | 0.0
Transfers from exploration & evaluation assets | 0.0 | 0.0
Exploration and evaluation expenditures |  | 1.9
Balance, end of the year | 0.0 | 11.1
Exploration and evaluation assets | Monster Lake project |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 7.8 | 7.8
Reclassification to assets held for sale |  | 0.0
Transfers within property, plant and equipment | 0.0 |
Impairment charge | 0.0 | 0.0
Transfers from exploration & evaluation assets | 0.0 | 0.0
Exploration and evaluation expenditures |  | 0.0
Balance, end of the year | 7.8 | 7.8
Exploration and evaluation assets | Gosselin |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 5.0 | 5.0
Reclassification to assets held for sale |  | 0.0
Transfers within property, plant and equipment | 0.0 |
Impairment charge | 0.0 | 0.0
Transfers from exploration & evaluation assets | (1.5) | 0.0
Exploration and evaluation expenditures |  | 0.0
Balance, end of the year | 3.5 | 5.0
Exploration and evaluation assets | Nelligan |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 1.8 | 1.8
Reclassification to assets held for sale |  | 0.0
Transfers within property, plant and equipment | 0.0 |
Impairment charge | 0.0 | 0.0
Transfers from exploration & evaluation assets | 0.0 | 0.0
Exploration and evaluation expenditures |  | 0.0
Balance, end of the year | 1.8 | 1.8
Exploration and evaluation assets | Other |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 2.6 | 1.3
Reclassification to assets held for sale |  | 0.0
Transfers within property, plant and equipment | 0.0 |
Impairment charge | (1.3) | 0.0
Transfers from exploration & evaluation assets | 0.0 | 1.3
Exploration and evaluation expenditures |  | 0.0
Balance, end of the year | $ 1.3 | $ 2.6

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- Definition The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2023-01-01 -Paragraph 24 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2023-en-r&anchor=para_24_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 98 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_98_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers from construction in progress. [Refer: Property, plant and equipment; Construction in progress] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e&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 a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_a&doctype=Standard -URIDate 2023-03-23 + Details
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