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LEASES - Amounts recgonized in statement of earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of leases [Abstract]
Short-term and low-value leases	$ 43.7	$ 25.6
Variable lease payments	$ 4.6	$ 12.0

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- Definition

Disclosure of leases [Abstract]

+ References

No definition available.

+ Details

Name:	iag_DisclosureofleasesAbstract
Namespace Prefix:	iag_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Expense Relating to Short-Term and Low-Value Leases for Which Recognition Exemption has Been Used

+ References

No definition available.

+ Details

Name:	iag_ExpenseRelatingtoShortTermandLowValueLeasesforWhichRecognitionExemptionhasBeenUsed
Namespace Prefix:	iag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- 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