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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