XML 208 R119.htm IDEA: XBRL DOCUMENT v3.22.0.1
EXPLORATION AND EVALUATION ASSETS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of the year     $ 2,362.0  
Exploration and evaluation expenditures     38.1 $ 27.9
Balance, end of the year $ 2,362.0 $ 2,362.0 2,587.9 2,362.0
Exploration and evaluation assets        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of the year     54.8 42.2
Exploration and evaluation expenditures     1.9  
Acquired Exploration and evaluation assets     5.0 12.6
Balance, end of the year 54.8 54.8 61.7 54.8
Exploration and evaluation assets | Diakha-Siribaya Gold project        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of the year     36.6 36.6
Exploration and evaluation expenditures     0.0  
Acquired Exploration and evaluation assets     0.0 0.0
Balance, end of the year 36.6 36.6 36.6 36.6
Exploration and evaluation assets | Fayolle property        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of the year     7.3 0.0
Exploration and evaluation expenditures     1.9  
Acquired Exploration and evaluation assets   0.6 0.0 7.3
Balance, end of the year 7.3 7.3 9.2 7.3
Exploration and evaluation assets | Monster Lake project        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of the year     7.8 2.5
Exploration and evaluation expenditures     0.0  
Acquired Exploration and evaluation assets 5.3   0.0 5.3
Balance, end of the year 7.8 7.8 7.8 7.8
Exploration and evaluation assets | Other Projects        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of the year     3.1 3.1
Exploration and evaluation expenditures     0.0  
Acquired Exploration and evaluation assets     5.0 0.0
Balance, end of the year $ 3.1 $ 3.1 $ 8.1 $ 3.1