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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.

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