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Financial instruments and risk management - Foreign currency risk (Details) | 12 Months Ended
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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] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard -URIDate 2020-01-01 + Details
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