XML 134 R111.htm IDEA: XBRL DOCUMENT
v3.19.1

Commitments and contingencies - Narrative (Details) $ in Thousands, t in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) agreement t | Dec. 31, 2017 USD ($)
Commitments And Contingencies [Abstract] |  |
Operating lease payments recognized as expense | $ | $ 186,800 | $ 181,400
Within one year |  |
Disclosure of associates [line items] |  |
Future minimum lease payments | $ | $ 79,692 |
Purchase commitment of methanol supply | Within one year |  |
Disclosure of associates [line items] |  |
Purchase commitments (in tonnes) | t | 1.2 |
Purchase commitment of methanol supply | Thereafter |  |
Disclosure of associates [line items] |  |
Purchase commitments (in tonnes) | t | 1.2 |
Atlas Joint Venture |  |
Disclosure of associates [line items] |  |
Percentage of marketing rights in production | 100.00% |
Percentage of ownership interest in associates | 63.10% | 63.10%
Atlas Joint Venture | Trinidad |  |
Disclosure of associates [line items] |  |
Percentage of ownership interest in associates | 63.10% |
Atlas Joint Venture | Egypt |  |
Disclosure of associates [line items] |  |
Percentage of ownership interest in associates | 50.00% |
Atlas Plant and Egypt Plant | Purchase commitment of methanol supply |  |
Disclosure of associates [line items] |  |
Purchase commitments (in tonnes) | t | 1.3 |
Delivery of vessels currently under construction |  |
Disclosure of associates [line items] |  |
Number of time charter agreements | agreement | 2 |
Future minimum lease payments | $ | $ 80,000 |
Lease term | 15 years |

X
- 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
Name: | ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
Name: | ifrs-full_MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The portion of operating lease payments that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
Name: | ifrs-full_MinimumOperatingLeasePayments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 2017-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInAssociate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Commitments And Contingencies + References No definition available. + Details
Name: | mx_CommitmentsAndContingenciesAbstract
Namespace Prefix: | mx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contingent Liabilities With Associates, Minimum Mass Required + References No definition available. + Details
Name: | mx_ContingentLiabilitiesWithAssociatesMinimumMassRequired
Namespace Prefix: | mx_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lease, Term + References No definition available. + Details
Name: | mx_LeaseTerm
Namespace Prefix: | mx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Charter Agreements + References No definition available. + Details
Name: | mx_NumberOfCharterAgreements
Namespace Prefix: | mx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proportion Of Marketing Rights Interest In Production + References No definition available. + Details
Name: | mx_ProportionOfMarketingRightsInterestInProduction
Namespace Prefix: | mx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=mx_PurchaseCommitmentOfMethanolSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=mx_AtlasMethanolCompanyUnlimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=mx_TRINIDADANDTOBAGOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=mx_EGYPTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=mx_AtlasPlantAndEgyptPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ArrangementsInvolvingLegalFormOfLeaseAxis=mx_DeliveryOfVesselsCurrentlyUnderConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |