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INCOME TAXES - Deferred Tax Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets | $ 0.0 |
Deferred tax liabilities | (168.8) |
Net deferred income tax liabilities | (168.8) | $ (180.6)
Statements of earnings | 109.8 | 11.7
OCI | (2.2) | (0.1)
Other | 0.0 | 0.2
Deferred tax assets | 0.0 | 0.0
Deferred tax liabilities | (61.2) | (168.8)
Net deferred income tax liabilities | (61.2) | (168.8)
Non-capital losses |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets | 58.6 | 22.5
Statements of earnings | 151.8 | 36.1
OCI | 0.0 | 0.0
Other | 0.0 | 0.0
Deferred tax assets | 210.4 | 58.6
Asset retirement obligations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets | 1.2 | 0.0
Statements of earnings | 0.5 | 1.2
OCI | 0.0 | 0.0
Other | 0.0 | 0.0
Deferred tax assets | 1.7 | 1.2
Other deductible temporary differences |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets | 30.8 | 28.1
Statements of earnings | 9.0 | 2.5
OCI | (2.6) | 0.2
Other | 0.0 | 0.0
Deferred tax assets | 37.2 | 30.8
Plant and equipment |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities | (225.6) | (197.1)
Statements of earnings | (55.4) | (28.5)
OCI | 0.0 | 0.0
Other | 0.0 | 0.0
Deferred tax liabilities | (281.0) | (225.6)
Royalty interests |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities | (4.6) | (5.3)
Statements of earnings | 4.2 | 0.7
OCI | 0.0 | 0.0
Other | 0.0 | 0.0
Deferred tax liabilities | (0.4) | (4.6)
Marketable securities |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities | (0.2) | 0.0
Statements of earnings | (0.2) | 0.1
OCI | 0.4 | (0.3)
Other | 0.0 | 0.0
Deferred tax liabilities | 0.0 | (0.2)
Inventory and reserves |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities | (18.5) | (26.4)
Statements of earnings | 11.1 | 7.9
OCI | 0.0 | 0.0
Other | 0.0 | 0.0
Deferred tax liabilities | (7.4) | (18.5)
Other liabilities |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities | (10.5) | (2.4)
Statements of earnings | (11.2) | (8.3)
OCI | 0.0 | 0.0
Other | 0.0 | 0.2
Deferred tax liabilities | $ (21.7) | $ (10.5)

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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 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_o&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_56&doctype=Standard -URIDate 2021-03-24 + Details
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