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Financial risk management - Sensitivity analysis of exchange and interest rate risk (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / $
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
ARS ($)
Financial risk management        
Net liability position in foreign currency $ 518.0      
Financial liabilities   $ 26,220.0   $ 22,912.0
Loans        
Financial risk management        
Financial liabilities   12,235.0   11,912.0
Currency risk        
Financial risk management        
Net liability position in foreign currency $ 592.0 11,037.0   $ 9,779.0
Estimated variation in exchange rate | $ / $ 0.10      
Estimated variation in consolidated amounts of foreign currency position   59.0    
Net liability position in foreign currency $ 518.0 9,559.0 $ 595.0  
Estimated variation in consolidated amounts of foreign currency position on the portion not covered by derivative financial instruments and other assets   52.0    
Interest rate risk        
Financial risk management        
Variation in agreed interest rates (as a percent) 0.10%      
Interest rate risk | Bank overdrafts | Pesos        
Financial risk management        
Financial liabilities   135.0    
Effect   0.1    
Interest rate risk | Term Notes | Pesos        
Financial risk management        
Financial liabilities   871.0    
Effect   $ 0.9    
Interest rate risk | Term Notes | U.S. dollars        
Financial risk management        
Financial liabilities $ 78.0      
Effect 1.4      
Interest rate risk | Loans | U.S. dollars        
Financial risk management        
Financial liabilities 500.0      
Effect $ 9.3