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Derivative Financial Liabilities
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Derivative Financial Liabilities
27.2
  
DERIVATIVE FINANCIAL LIABILITIES
             
 
 
 
   Ghanaian oil derivative contracts  
 
10.0
 
   —        
   Australian oil derivative contracts  
 
5.1
 
   —        
   Peruvian copper derivative contracts  
 
14.0
 
   —        
   Australian gold derivative contracts  
 
—  
 
   78.3      
   South Deep gold derivative contracts  
 
—  
 
   12.6      
   Ghanaian gold derivative contracts  
 
—  
 
   36.4      
   Australian foreign currency derivative contracts  
 
—  
 
   0.3      
      
 
 
   
 
 
      
   
Total derivative financial liabilities
2
  
 
29.1
 
   127.6      
   
Non-current
derivative financial liabilities
3
  
 
(7.3
) 
   —        
      
 
 
   
 
 
      
   
Derivative financial liabilities
  
 
21.8
 
   127.6