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Financial instruments and risk management - Interest rate risk (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 MXN ($) item | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Interest rate risk |  |  |
Derivative financial liabilities | $ 9,657 |  |
Loss on cash flow hedges | 1,306,557 | $ 67,629 | $ (455,009)
Interest rate swap contracts |  |  |
Interest rate risk |  |  |
Derivative financial liabilities | $ 326 | $ 2,695 |
28-day TIIE |  |  |
Interest rate risk |  |  |
Spread on interest rate basis |  | 3.00% |
Number of caplets | item | 59 |  |
28-day TIIE | Maximum |  |  |
Interest rate risk |  |  |
Spread on interest rate basis | 10.00% |  |

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition 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. + References No definition available. + Details
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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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- Details
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