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Related parties - Subsidiaries and joint ventures (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Methanex Asia Pacific Limited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Services (Shanghai) Co., Ltd. |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Europe NV |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Methanol Company, LLC |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Egyptian Methanex Methanol Company S.A.E. ("Methanex Egypt") |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 50.00% | 50.00%
Methanex Chile SpA |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex New Zealand Limited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Trinidad (Titan) Unlimited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex USA LLC |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Louisiana LLC |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Waterfront Shipping Company Limited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Atlas Methanol Company Unlimited |  |
Disclosure of associates [line items] |  |
Interest % | 63.10% | 63.10%

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- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2020-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2020-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2020-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2020-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2020-01-01 + Details
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