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Significant accounting policies (Details) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 614.75 | 669.47
Brazilian real [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 3.02 | 3.25
New Peruvian sol [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 3.08 | 3.35
Argentine peso [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 18.40 | 15.84
Japanese yen [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 113.00 | 116.83
Euro [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 0.83 | 0.95
Mexican peso [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 19.65 | 20.63
Australian dollar [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 0.78 | 0.72
Pound Sterling [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 0.74 | 0.81
South African rand [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 12.35 | 13.70
Ecuadorian dollar [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 1.00 | 1.00
Chilean peso [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 614.75 | 669.47
Chinese yuan [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 6.51 | 6.67
Indian rupee [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 63.84 | 66.60
Thai baht [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 32.85 | 34.59
UF [Member] |  |
Significant accounting policies [Line Items] |  |
Closing foreign exchange rate | 43.59 | 39.36

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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