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INCOME TAXES - Deferred Tax Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | $ 0.0 |
Deferred tax liabilities opening balance | (22.6) |
Net deferred income tax liabilities opening balance | (22.6) | $ (61.2)
Statements of earnings (loss) | 21.2 | (0.5)
OCI | 0.7 | 0.8
Deferred tax assets ending balance | 0.0 | 0.0
Deferred tax liabilities ending balance | (0.7) | (22.6)
Net deferred income tax liabilities ending balance | (0.7) | (22.6)
Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) | 0.0 | 38.3
Exploration and evaluation assets |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 307.7 | 0.0
Statements of earnings (loss) | 134.7 | 307.7
OCI | 0.0 | 0.0
Deferred tax assets ending balance | 442.4 | 307.7
Exploration and evaluation assets | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) | 0.0 | 0.0
Non-capital losses |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 0.0 | 210.4
Statements of earnings (loss) |  | (172.6)
OCI |  | 0.0
Deferred tax assets ending balance |  | 0.0
Non-capital losses | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) |  | (37.8)
Asset retirement obligations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 2.5 | 1.7
Statements of earnings (loss) | (2.5) | 0.8
OCI | 0.0 | 0.0
Deferred tax assets ending balance | 0.0 | 2.5
Asset retirement obligations | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) | 0.0 | 0.0
Repurchase Agreements |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 0.0 |
Statements of earnings (loss) | 91.5 |
OCI | 0.0 |
Deferred tax assets ending balance | 91.5 | 0.0
Repurchase Agreements | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) | 0.0 |
Other deductible temporary differences |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 37.4 | 37.2
Statements of earnings (loss) |  | (0.7)
OCI |  | 0.9
Deferred tax assets ending balance |  | 37.4
Other deductible temporary differences | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) |  | 0.0
Plant and equipment |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | (355.3) | (281.0)
Statements of earnings (loss) | (217.5) | (140.4)
OCI | 0.0 | 0.0
Deferred tax liabilities ending balance | (572.8) | (355.3)
Plant and equipment | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) | 0.0 | 66.1
Royalty interests |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | (0.3) | (0.4)
Statements of earnings (loss) |  | 0.1
OCI |  | 0.0
Deferred tax liabilities ending balance |  | (0.3)
Royalty interests | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) |  | 0.0
Marketable securities |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | 0.0 | 0.0
Statements of earnings (loss) |  | 0.1
OCI |  | (0.1)
Deferred tax liabilities ending balance |  | 0.0
Marketable securities | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) |  | 0.0
Inventories and reserves |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | (3.1) | (7.4)
Statements of earnings (loss) |  | (5.7)
OCI |  | 0.0
Deferred tax liabilities ending balance |  | (3.1)
Inventories and reserves | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) |  | 10.0
Other assets |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax assets opening balance | 34.3 |
Statements of earnings (loss) | 8.8 |
OCI | 0.7 |
Deferred tax assets ending balance | 43.8 | 34.3
Other assets | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) | 0.0 |
Other liabilities |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | (11.8) |
Statements of earnings (loss) | 6.2 |
OCI | 0.0 |
Deferred tax liabilities ending balance | (5.6) | (11.8)
Other liabilities | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) | 0.0 |
Other liabilities |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Deferred tax liabilities opening balance | $ (11.5) | (21.7)
Statements of earnings (loss) |  | 10.2
OCI |  | 0.0
Deferred tax liabilities ending balance |  | (11.5)
Other liabilities | Discontinued operations |  |
Reconciliation of changes in deferred tax asset (liability) [abstract] |  |
Statements of earnings (loss) |  | $ 0.0

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