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INCOME TAXES - Deferred Tax Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax assets opening balance $ 0.0  
Deferred tax liabilities opening balance (0.7)  
Net deferred income tax liabilities opening balance (0.7) $ (22.6)
Statements of earnings (loss) (13.0) 21.2
OCI (0.3) 0.7
Deferred tax assets ending balance 0.0 0.0
Deferred tax liabilities ending balance (14.0) (0.7)
Net deferred income tax liabilities ending balance (14.0) (0.7)
Exploration and evaluation assets    
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax assets opening balance 442.4 307.7
Statements of earnings (loss) (159.1) 134.7
OCI 0.0 0.0
Deferred tax assets ending balance 283.3 442.4
Asset retirement obligations    
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax assets opening balance 0.0 2.5
Statements of earnings (loss) 52.6 (2.5)
OCI 0.0 0.0
Deferred tax assets ending balance 52.6 0.0
Repurchase option    
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax assets opening balance 91.5 0.0
Statements of earnings (loss) (91.5) 91.5
OCI 0.0 0.0
Deferred tax assets ending balance 0.0 91.5
Other assets    
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax assets opening balance 43.8 34.3
Statements of earnings (loss) 17.6 8.8
OCI (0.1) 0.7
Deferred tax assets ending balance 61.3 43.8
Plant and equipment    
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax liabilities opening balance (572.8) (355.3)
Statements of earnings (loss) 189.7 (217.5)
OCI 0.0 0.0
Deferred tax liabilities ending balance (383.1) (572.8)
Mining duties    
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax liabilities opening balance 0.0  
Statements of earnings (loss) (7.4)  
OCI 0.0  
Deferred tax liabilities ending balance (7.4) 0.0
Other liabilities    
Reconciliation of changes in deferred tax asset (liability) [abstract]    
Deferred tax liabilities opening balance (5.6) (11.8)
Statements of earnings (loss) (14.9) 6.2
OCI (0.2) 0.0
Deferred tax liabilities ending balance $ (20.7) $ (5.6)