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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets $ 0.0 $ 0.0  
Net deferred tax liabilities (14.0) (0.7)  
Net deferred tax liabilities (14.0) (0.7) $ (22.6)
Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 397.2 577.7  
Net deferred tax liabilities (411.2) (578.4)  
Exploration and evaluation assets      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 283.3 442.4 307.7
Exploration and evaluation assets | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 283.3 442.4  
Asset retirement obligations      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 52.6 0.0 2.5
Asset retirement obligations | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 52.6 0.0  
Repurchase option      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 0.0 91.5 0.0
Repurchase option | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 0.0 91.5  
Other assets | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 61.3 43.8  
Plant and equipment      
Deferred tax assets and liabilities [abstract]      
Net deferred tax liabilities (383.1) (572.8) $ (355.3)
Plant and equipment | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Net deferred tax liabilities (383.1) (572.8)  
Mining duties | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Net deferred tax liabilities (7.4) 0.0  
Other liabilities | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Net deferred tax liabilities $ (20.7) $ (5.6)