United States Dollar  
  Figures in millions unless otherwise stated 2018      2017  2016   
30. ROYALTIES PAID            
  Amount owing at beginning of the year – continuing operations (16.3)     (19.8) (17.8)  
  Royalties – continuing operations (62.5)     (62.0) (78.4)  
  Amount owing at end of the year – continuing operations 12.5      16.3  19.8   
  Translation 0.8      (0.5) –   
  Total royalties paid – continuing operations (65.5)     (66.0) (76.4)