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Financial instruments and risk management - Foreign currency risk (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Foreign currency risk
Percentage of total collections denominated in U.S. dollars	40.00%	38.00%
United States of America and Central America
Foreign currency risk
Percentage of revenues	30.00%	33.00%

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- Definition

The percentage of the entity's revenue. [Refer: Revenue]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2017-01-01
-Paragraph 34
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-URIDate 2017-03-09

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Percentage of US dollar collections in total collections

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