XML 134 R111.htm IDEA: XBRL DOCUMENT
v3.20.4

Financial risk management - Interest rate risk (Details) - Interest rate risk - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 2,140,089 | $ 1,692,162
Reasonably possible change in risk variable, percent | 1.00% |
Reasonably possible change in risk variable, impact on debt | $ 185,200 | 130,600
Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 223,283 | 76,691
Reasonably possible change in risk variable, percent | 1.00% |
Reasonably possible change in risk variable, impact on pre-tax earnings | $ 2,200 | 800
Unsecured notes | Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 1,979,125 | 1,535,662
Other limited recourse debt facilities | Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 160,964 | 156,500
Other limited recourse debt facilities | Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 0 | 1,526
Geismar 3 construction facility | Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 176,335 | 0
Egypt limited recourse debt facilities | Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 46,948 | $ 75,165

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_DisclosureOfFinancialInstrumentsByTypeOfInterestRateLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Debt + References No definition available. + Details
Name: | mx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableDebt
Namespace Prefix: | mx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On Pre-Tax Earnings + References No definition available. + Details
Name: | mx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnPreTaxEarnings
Namespace Prefix: | mx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent + References No definition available. + Details
Name: | mx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariablePercent
Namespace Prefix: | mx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=ifrs-full_FixedInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=ifrs-full_FloatingInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=mx_UnsecuredDebt1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=mx_OtherLimitedRecourseDebtFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=mx_Geismar3ConstructionFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=mx_EgyptLimitedRecourseDebtFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |