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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Schedule of Treasury Shares
     USD     Quantity     Share value
(USD)		      Net income of
uses		  
  

 

 

    

 

 

    

 

 

     

 

 

  

At the beggining of the year

      51.8       7,423,705       7.0        —    

Used for stock options plan(i)

      (20.4 )      (2,446,007 )      8.3        10.9  
  

 

 

    

 

 

    

 

 

     

 

 

  

At December 31, 2018

      31.4       4,977,698       6.3        10.9  
  

 

 

    

 

 

    

 

 

     

 

 

  

 

(i)

The beneficiaries of the shares used in the share-based compensation plan include the Statutory Board of Directors, Executive Directors and certain employees. Refer to Note 28.