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Summary of significant accounting policies (Details 2) - $ / perunit
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
US Dollar [Member]      
Statement [Line Items]      
Closing foreign exchange rate 710.95 748.74 694.77
Euros [Member]      
Statement [Line Items]      
Closing foreign exchange rate 873.30 839.58 794.75
Argentinean Pesos [Member]      
Statement [Line Items]      
Closing foreign exchange rate 8.45 12.50 18.43
Uruguayan Peso [Member]      
Statement [Line Items]      
Closing foreign exchange rate 16.79 20.07 21.44
Canadian Dollar [Member]      
Statement [Line Items]      
Closing foreign exchange rate 557.00 573.26 509.62
Sterling Pound [Member]      
Statement [Line Items]      
Closing foreign exchange rate 967.15 983.24 882.36
Paraguayan Guarani [Member]      
Statement [Line Items]      
Closing foreign exchange rate 0.10 0.12 0.12
Swiss Franc [Member]      
Statement [Line Items]      
Closing foreign exchange rate 804.97 773.81 706.00
Bolivians [Member]      
Statement [Line Items]      
Closing foreign exchange rate 102.15 107.58 101.28
Australian Dollar [Member]      
Statement [Line Items]      
Closing foreign exchange rate 545.88 524.25 489.17
Danish Krone [Member]      
Statement [Line Items]      
Closing foreign exchange rate 117.40 112.41 106.44
Brazilian Real [Member]      
Statement [Line Items]      
Closing foreign exchange rate 137.33 186.51 179.59
Unidades de Fomento [Member]      
Statement [Line Items]      
Closing foreign exchange rate [1] 29,070.33 28,309.94 27,565.79
Colombian Peso [Member]      
Statement [Line Items]      
Closing foreign exchange rate 0.21 0.23 0.21
Unidad de indexada [Member]      
Statement [Line Items]      
Closing foreign exchange rate [2] 80.45 87.98 86.19
Average US Dollar [Member]      
Statement [Line Items]      
Closing foreign exchange rate 734.73 770.39 681.99
[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 month´s 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 month´s inflation rate.