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Financial instruments and risk management - Foreign currency risk (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign currency risk
Percentage of total collections denominated in U.S. dollars	43.00%	38.00%	40.00%
United States of America and Central America
Foreign currency risk
Percentage of revenues	29.00%	32.00%	30.00%

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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 2019-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_34&doctype=Standard
-URIDate 2019-03-27

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Percentage of US dollar collections in total collections

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