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PROPERTY, PLANT AND EQUIPMENT - Disclosure of property, plant and equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | $ 2,362.0 |
Balance, end of the year | 2,587.9 | $ 2,362.0
Percent of assets and liabilities derecognized |  | 30.00%
Gains on disposals of investments |  | $ 16.9
Construction in progress |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 624.8 |
Balance, end of the year | 1,078.6 | 624.8
Mining properties |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 1,021.8 |
Balance, end of the year | 885.7 | 1,021.8
Plant and equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 642.6 |
Balance, end of the year | 559.3 | 642.6
Right-of-use assets1 |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 72.8 |
Balance, end of the year | 64.3 | 72.8
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 5,790.2 | 5,497.3
Additions | 721.7 | 390.7
Changes in asset retirement obligations | 42.0 | 7.6
Disposals | (83.8) | (70.0)
Derecognition on the establishment of the Rosebel UJV |  | (35.4)
Transfers within property, plant and equipment | 0.0 | 0.0
Balance, end of the year | 6,470.1 | 5,790.2
Cost | Construction in progress |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 624.8 | 504.2
Additions | 474.8 | 164.2
Changes in asset retirement obligations | 0.0 | 0.0
Disposals | 0.0 | 0.0
Derecognition on the establishment of the Rosebel UJV |  | (2.0)
Transfers within property, plant and equipment | (21.0) | (41.6)
Balance, end of the year | 1,078.6 | 624.8
Cost | Mining properties |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 3,106.6 | 2,961.0
Additions | 142.3 | 130.4
Changes in asset retirement obligations | 42.0 | 7.6
Disposals | 0.0 | 0.0
Derecognition on the establishment of the Rosebel UJV |  | (32.1)
Transfers within property, plant and equipment | 14.1 | 39.7
Balance, end of the year | 3,305.0 | 3,106.6
Cost | Plant and equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 1,966.6 | 1,964.0
Additions | 83.2 | 70.0
Changes in asset retirement obligations | 0.0 | 0.0
Disposals | (79.4) | (67.8)
Derecognition on the establishment of the Rosebel UJV |  | (1.3)
Transfers within property, plant and equipment | 7.5 | 1.7
Balance, end of the year | 1,977.9 | 1,966.6
Cost | Right-of-use assets1 |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 92.2 | 68.1
Additions | 21.4 | 26.1
Changes in asset retirement obligations | 0.0 | 0.0
Disposals | (4.4) | (2.2)
Derecognition on the establishment of the Rosebel UJV |  | 0.0
Transfers within property, plant and equipment | (0.6) | 0.2
Balance, end of the year | 108.6 | 92.2
Accumulated Depreciation and Impairment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | (3,428.2) | (3,257.7)
Depreciation expense | 327.4 | 283.6
Disposals | 78.5 | 67.1
Impairment charge | 205.1 |
Derecognition on the establishment of the Rosebel UJV |  | (0.2)
Reversal of impairment |  | (45.8)
Balance, end of the year | (3,882.2) | (3,428.2)
Accumulated Depreciation and Impairment | Construction in progress |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | 0.0 | 0.0
Depreciation expense | 0.0 | 0.0
Disposals | 0.0 | 0.0
Impairment charge | 0.0 |
Derecognition on the establishment of the Rosebel UJV |  | 0.0
Reversal of impairment |  | 0.0
Balance, end of the year | 0.0 | 0.0
Accumulated Depreciation and Impairment | Mining properties |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | (2,084.8) | (1,987.4)
Depreciation expense | 180.4 | 143.3
Disposals | 0.0 | 0.0
Impairment charge | 154.1 |
Derecognition on the establishment of the Rosebel UJV |  | (0.1)
Reversal of impairment |  | (45.8)
Balance, end of the year | (2,419.3) | (2,084.8)
Accumulated Depreciation and Impairment | Plant and equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | (1,324.0) | (1,261.8)
Depreciation expense | 131.6 | 127.8
Disposals | 74.3 | 65.5
Impairment charge | 37.3 |
Derecognition on the establishment of the Rosebel UJV |  | (0.1)
Reversal of impairment |  | 0.0
Balance, end of the year | (1,418.6) | (1,324.0)
Accumulated Depreciation and Impairment | Right-of-use assets1 |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of the year | (19.4) | (8.5)
Depreciation expense | 15.4 | 12.5
Disposals | 4.2 | 1.6
Impairment charge | 13.7 |
Derecognition on the establishment of the Rosebel UJV |  | 0.0
Reversal of impairment |  | 0.0
Balance, end of the year | $ (44.3) | $ (19.4)

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_98_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from revaluations to fair value. [Refer: Property, plant and equipment; Revaluation surplus] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_iv&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 77 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_77_f&doctype=Standard -URIDate 2021-03-24 + Details
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