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Royalties Paid (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Royalty Paid
     UNITED STATES DOLLAR  
     2017      2016      2015  
Amount owing at beginning of the year - continuing operations      (19.8 )       (17.8 )       (19.9 ) 
Royalties - continuing operations      (62.0 )       (78.4 )       (73.9 ) 
Amount owing at end of the year - continuing operations      16.3        19.8        17.8  
Translation      (0.5 )       —          1.0  
  

 

 

     

 

 

     

 

 

  
Total royalties paid - continuing operations      (66.0 )       (76.4 )       (75.0 )