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Basis of preparation of the financial statements - Presentation currency (Details) | 12 Months Ended |  |  |
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Dec. 31, 2020 R$ / $ | Dec. 31, 2020 R$ / $ R$ / € | Dec. 31, 2020 R$ / $ R$ / $ | Dec. 31, 2019 R$ / $ | Dec. 31, 2019 R$ / $ R$ / € | Dec. 31, 2019 R$ / $ R$ / $ | Dec. 31, 2018 R$ / $ | Dec. 31, 2018 R$ / $ R$ / € | Dec. 31, 2018 R$ / $ R$ / $ | Dec. 31, 2020 R$ / € | Dec. 31, 2020 R$ / $ | Dec. 31, 2019 R$ / € | Dec. 31, 2019 R$ / $ | Dec. 31, 2018 R$ / € | Dec. 31, 2018 R$ / $
Exchange rates used to translate operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing rate | 5.1967 | 5.1967 | 5.1967 | 4.0307 | 4.0307 | 4.0307 | 3.8748 | 3.8748 | 3.8748 | 6.3779 | 4.0771 | 4.5305 | 3.1034 | 4.4390 | 2.8451
Average rate | 5.1578 | 5.8989 | 3.8480 | 3.9461 | 4.4159 | 2.9746 | 3.6558 | 4.3094 | 2.8190 |  |  |  |  |  |

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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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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