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Taxation - Statutory tax rate (Details)
12 Months Ended
Dec. 31, 2017
Argentina  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Applicable tax rate 35.00%
Brazil  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Applicable tax rate 34.00%
Uruguay  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Applicable tax rate 25.00%
SPAIN  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Applicable tax rate 25.00%
LUXEMBOURG  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Applicable tax rate 26.00%