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Change in Working Capital (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Change in Working Capital
      
UNITED STATES DOLLAR
 
      
2020
   2019   2018 
29.
  
CHANGE IN WORKING CAPITAL
      
   Inventories  
 
(89.9
) 
   (56.2)    0.8 
   Trade and other receivables  
 
(88.0
) 
   (5.6)    (0.5) 
   Trade and other payables  
 
6.1
 
   37.2    (32.2) 
      
 
 
   
 
 
   
 
 
 
   
Total change in working capital
  
 
(171.8
) 
   (24.6)    (31.9)