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Financial instruments and risk management - Foreign currency risk (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Foreign currency risk
Percentage of total collections denominated in U.S. dollars	44.00%	43.00%	38.00%
United States of America and Central America
Foreign currency risk
Percentage of revenues	27.00%	29.00%	32.00%

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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 2020-01-01
-Paragraph 34
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-URIDate 2020-01-01

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Percentage of US dollar collections in total collections

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