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Capital Management (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Reconciliation of Net Operating Profit
      
2020
   2019 
   
Notes
  
US$ million
   US$ million 
Total borrowings
  24  
 
1,526.9
 
   1,845.8 
Add: Lease liability
     
 
429.0
 
   332.9 
Less: Cash and cash equivalents
  21  
 
886.8
 
   515.0 
      
 
 
   
 
 
 
Net debt
     
 
1,069.1
 
   1,663.7 
Adjusted EBITDA
     
 
1,910.2
 
   1,290.2 
Net debt to adjusted EBITDA
 
ratio
     
 
0.56
 
   1.29 
      
 
 
   
 
 
 
Reconciliation of profit for the year to adjusted EBITDA:
          
Profit for the year
     
 
745.4
 
   174.7 
Mining and income taxation
     
 
432.5
 
   175.6 
Royalties
     
 
105.0
 
   73.7 
Finance expense
     
 
126.7
 
   102.2 
Investment income
     
 
(8.7
) 
   (7.3) 
Loss on financial instruments
     
 
238.9
 
   238.0 
Foreign exchange (gain)/loss
     
 
(8.6
) 
   5.2 
Amortisation and depreciation
  2  
 
661.3
 
   610.0 
Share-based payments
     
 
14.5
 
   20.5 
Long-term incentive plan
     
 
51.3
 
   9.1 
Restructuring costs
     
 
2.0
 
   0.6 
Silicosis settlement costs
     
 
0.3
 
   (1.6) 
Impairment, net of reversal of impairment of investments and assets
     
 
(50.6
) 
   9.8 
Loss/(profit) on disposal of assets
     
 
0.2
 
   (1.2) 
Share of results of equity accounted investees, net of taxation
     
 
2.6
 
   (3.1) 
Rehabilitation expense
  
8

  
 
1.5
 
   13.4 
Realised loss on derivative contracts
     
 
(416.6
) 
   (132.1) 
Tarkwa expected credit loss
     
 
29.0
 
   —   
Salares VAT
     
 
(23.9
) 
   —   
Other
     
 
7.4
 
   2.7 
      
 
 
   
 
 
 
Adjusted EBITDA
     
 
1,910.2
 
   1,290.2