XML 114 R77.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Share-based compensation - Weighted average assumptions (Details) - SARs and TSARs | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) year | Dec. 31, 2016 USD ($) year
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Risk-free interest rate | 1.80% | 1.00%
Expected dividend yield | 2.00% | 2.50%
Expected life of SARs and TSARs (years) | year | 1.2 | 1.4
Expected volatility | 31.00% | 41.00%
Expected forfeitures | 0.20% | 0.20%
Weighted average fair value (USD per share) | $ | $ 19.02 | $ 10.19

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

X
- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Expected Dividend As Percentage, Other Equity Instruments Granted + References No definition available. + Details
Name: | mx_ExpectedDividendAsPercentageOtherEquityInstrumentsGranted
Namespace Prefix: | mx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected Forfeiture As Percentage, Other Equity Instruments Granted + References No definition available. + Details
Name: | mx_ExpectedForfeitureAsPercentageOtherEquityInstrumentsGranted
Namespace Prefix: | mx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected Volatility, Other Equity Instruments Granted + References No definition available. + Details
Name: | mx_ExpectedVolatilityOtherEquityInstrumentsGranted
Namespace Prefix: | mx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Equity Instruments Life, Other Equity Instruments Granted + References No definition available. + Details
Name: | mx_OtherEquityInstrumentsLifeOtherEquityInstrumentsGranted
Namespace Prefix: | mx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk Free Interest Rate, Other Equity Instruments Granted + References No definition available. + Details
Name: | mx_RiskFreeInterestRateOtherEquityInstrumentsGranted
Namespace Prefix: | mx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=mx_ShareAppreciationRightsSARAndTandemShareAppreciationRightsTSARMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |