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Included in Profit Before Royalties and Taxation (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of Amounts Included in Profit Before Royalties and Taxation
     UNITED STATES DOLLAR  
     2017      2016      2015  

Operating lease charges1

      (2.4 )       (2.8 )       (2.7 ) 

Regulatory legal fees1

      —          —          (0.1 ) 

Profit on buy-back of notes1

      —          17.7        —    

Social contributions and sponsorships1

      (19.6 )       (19.3 )       (12.2 ) 

Global compliance costs1

      —          (0.1 )       (3.6 ) 

Rehabilitation income - continuing operations1

      13.5        9.7        14.6  

Rehabilitation income - discontinued operations1

      —          0.2        0.5