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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of Inventories
     UNITED STATES DOLLAR  
     2017      2016  

Gold-in-process and stockpiles

      305.4        234.3  

Consumable stores1

      220.9        227.9  
  

 

 

     

 

 

  

Total inventories2

      526.3        462.2  

Heap leach and stockpiles inventories included in non-current assets3

      (132.8 )       (132.8 ) 
  

 

 

     

 

 

  

Total current inventories4

      393.5        329.4