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Finance Expense (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Finance Expense
     UNITED STATES DOLLAR  
     2017      2016      2015  
            Restated1      Restated1  

Interest expense – environmental rehabilitation

      (12.1 )       (10.7 )       (11.7 ) 

Unwinding of discount on silicosis settlement costs

      (0.9 )       —          —    

Interest expense – borrowings

      (91.2 )       (82.5 )       (87.8 ) 

Borrowing costs capitalised

      22.9        15.1        16.6  
  

 

 

     

 

 

     

 

 

  

Total finance expense

      (81.3 )       (78.1 )       (82.9 )