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Summary of significant accounting policies (Details 1) - $ / perunit
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
US Dollar [Member]      
Statement [Line Items]      
Closing foreign exchange rate 748.74 694.77 614.75
Euros [Member]      
Statement [Line Items]      
Closing foreign exchange rate 839.58 794.75 739.15
Argentinean Pesos [Member]      
Statement [Line Items]      
Closing foreign exchange rate 12.50 18.43 32.96
Uruguayan Peso [Member]      
Statement [Line Items]      
Closing foreign exchange rate 20.07 21.44 21.34
Canadian Dollar [Member]      
Statement [Line Items]      
Closing foreign exchange rate 573.26 509.62 491.05
Sterling Pound [Member]      
Statement [Line Items]      
Closing foreign exchange rate 983.24 882.36 832.09
Paraguayan Guarani [Member]      
Statement [Line Items]      
Closing foreign exchange rate 0.12 0.12 0.11
Swiss Franc [Member]      
Statement [Line Items]      
Closing foreign exchange rate 773.81 706.00 631.16
Bolivians [Member]      
Statement [Line Items]      
Closing foreign exchange rate 107.58 101.28 89.61
Australian Dollar [Member]      
Statement [Line Items]      
Closing foreign exchange rate 524.25 489.17 480.31
Danish Krone [Member]      
Statement [Line Items]      
Closing foreign exchange rate 112.41 106.44 99.31
Brazilian Real [Member]      
Statement [Line Items]      
Closing foreign exchange rate 186.51 179.59 185.64
Unidades de Fomento [Member]      
Statement [Line Items]      
Closing foreign exchange rate [1] 28,309.94 27,565.79 26,798.14
Colombian Peso [Member]      
Statement [Line Items]      
Closing foreign exchange rate 0.23 0.21 0.21
Unidad de indexada [Member]      
Statement [Line Items]      
Closing foreign exchange rate [2] 87.98 86.19 79.62
[1] The Unidad de Fomento (UF) is a Chilean inflation-indexed, Chilean peso-denominated monetary unit. The UF rate is set daily in advance based on changes in the previous months inflation rate.
[2] The Unidad Indexada (UI) is a Uruguay inflation-indexed, Uruguayan peso-denominated monetary unit. The UI rate is set daily in advance based on changes in the previous months inflation rate.