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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of Related Party Transactions Activities
     UNITED STATES DOLLAR  
     2017      2016      2015  

Key management remuneration

(Executive Committee)

         

Short-term employee benefits

      11.0        11.4        10.7  

Severance

      0.2        1.6        —    

Pension scheme contribution

      0.5        0.5        0.7  

Share-based payments

      3.7        1.4        2.3  

Long-term incentive plan

      1.0        1.1        1.1  
  

 

 

     

 

 

     

 

 

  
     16.4        16.0        14.8