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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)