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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets $ 0.0 $ 0.0  
Deferred income tax liabilities (net) (0.7) (22.6)  
Net deferred income tax liabilities (0.7) (22.6) $ (61.2)
Deductible temporary differences for which no deferred tax asset is recognised 1,826.4 1,874.9  
Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 577.7 344.5  
Deferred income tax liabilities (net) (578.4) (367.1)  
Non-capital losses      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets   0.0 210.4
Deductible temporary differences for which no deferred tax asset is recognised 1,099.1 1,186.5  
Exploration and evaluation assets      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 442.4 307.7 0.0
Deductible temporary differences for which no deferred tax asset is recognised 338.6 380.8  
Exploration and evaluation assets | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 442.4 307.7  
Asset retirement obligations      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 0.0 2.5 1.7
Deductible temporary differences for which no deferred tax asset is recognised 265.3 213.3  
Asset retirement obligations | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 0.0 2.5  
Repurchase Agreements      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 91.5 0.0  
Repurchase Agreements | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 91.5 0.0  
Other assets | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets 43.8 34.3  
Property, plant and equipment      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (net) (572.8) (355.3) (281.0)
Property, plant and equipment | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (net) (572.8) (355.3)  
Other liabilities      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (net)   (11.5) (21.7)
Other liabilities | Before Offset Amount      
Deferred tax assets and liabilities [abstract]      
Deferred income tax liabilities (net) (5.6) (11.8)  
Net capital losses      
Deferred tax assets and liabilities [abstract]      
Deductible temporary differences for which no deferred tax asset is recognised 104.4 66.2  
Mining duties      
Deferred tax assets and liabilities [abstract]      
Deductible temporary differences for which no deferred tax asset is recognised 18.9 15.1  
Other deductible temporary differences      
Deferred tax assets and liabilities [abstract]      
Deferred income tax assets   37.4 $ 37.2
Deductible temporary differences for which no deferred tax asset is recognised $ 0.1 $ 13.0