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Other assets - Narrative (Details) $ in Millions	Dec. 31, 2020 USD ($) vessel	Dec. 31, 2019 USD ($)
Subclassifications of assets, liabilities and equities [abstract]
Restricted cash and cash equivalents	$ 42.0	$ 39.4
Restricted cash, major maintenance	$ 6.2
Restricted cash, number of vessels | vessel	2
Restricted cash, current hedge	$ 0.4

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- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ 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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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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X

- Definition

Restricted cash, current hedge

+ References

No definition available.

+ Details

Name:	mx_RestrictedCashCurrentHedge
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Restricted cash, major maintenance

+ References

No definition available.

+ Details

Name:	mx_RestrictedCashMajorMaintenance
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Restricted cash, number of vessels

+ References

No definition available.

+ Details

Name:	mx_RestrictedCashNumberOfVessels
Namespace Prefix:	mx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant