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Change in Working Capital (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Change in Working Capital
     UNITED STATES DOLLAR  
     2017      2016
Restated1		      2015
Restated1		  
          
Inventories      (55.1 )       (39.2 )       47.5  
Trade and other receivables      (2.2 )       2.8        36.5  
Trade and other payables      (12.1 )       34.1        (40.7 ) 
  

 

 

     

 

 

     

 

 

  
Total change in working capital      (69.4 )       (2.3 )       43.3