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Taxation Paid (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Detailed Information About Income Tax
     UNITED STATES DOLLAR  
     2017      2016      2015  
Amount owing at beginning of the year - continuing operations      (107.9 )       (59.3 )       (37.8 ) 
SA and foreign current taxation - continuing operations      (204.7 )       (204.2 )       (141.7 ) 
Amount owing at end of the year - continuing operations      77.5        107.9        59.3  
Translation      (4.4 )       —          3.0  
  

 

 

     

 

 

     

 

 

  
Total taxation paid - continuing operations      (239.5 )       (155.6 )       (117.2 )