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Summary of significant accounting policies (Tables)
 6 Months Ended
Jun. 30, 2020
Text block [abstract]  
Summary of Exchange Rates
The most important exchange rates that have been used in preparing the financial statements are:
 
   
Closing rate
   
Average rate
 
1 US dollar equals:
  
30 June 2020
   
31 December 2019
   
30 June 2020
   
30 June 2019
 
Argentinean peso
   70.454990    59.890668    —      —   
Brazilian real
   5.476011    4.030696    4.683731    3.834084 
Canadian dollar
   1.368460    1.299449    1.362592    1.339411 
Colombian peso
   
3 752.17
    
3 272.63
    
3 581.62
    
3 217.98
 
Chinese yuan
   7.074411    6.961461    7.052919    6.786388 
Euro
   0.893017    0.890155    0.906152    0.884945 
Mexican peso
   22.971498    18.845242    20.397344    19.218716 
Pound sterling
   0.814816    0.757344    0.791317    0.771278 
Peruvian nuevo sol
   3.544000    3.317006    3.377006    3.337727 
South Korean won
   1 201.90    1 154.54    1 204.98    1 143.34 
South African rand
   17.362387    14.044287    16.230856    14.176131