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Lease obligations - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) vessel	Dec. 31, 2023 USD ($) vessel
Disclosure of Leases [Abstract]
Expense relating to variable lease payments not included in measurement of lease liabilities	$ 90,900	$ 83,800
Expense relating to short-term leases for which recognition exemption has been used	400	200
Potential future lease payments not included in lease liabilities (undiscounted)	56,475	51,800
Lease not yet commenced, amount	$ 2,800	$ 68,700
Lease not yet commenced, number of vessel, additions | vessel	1	1
Lease not yet commenced, term (in years)	1 year	5 years

X

- Definition

The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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

X

- Definition

The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_e&doctype=Standard
-URIDate 2024-03-27

+ Details

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

X

- Definition

Disclosure of Leases [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	mx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee, Finance Lease, Lease Not yet Commenced, Number Of Vessels, Additions

+ References

No definition available.

+ Details

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

X

- Definition

Lessee, Finance Lease, Lease Not yet Commenced, Term

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Lessee, Finance Lease, Lease Not yet Commenced, Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Lessee, Finance Lease, Option to Extend, Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant