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LEASES - Amounts recgonized in statement of earnings (Details) - USD ($) $ in Millions | 12 Months Ended
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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
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Namespace Prefix: | iag_
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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
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Namespace Prefix: | iag_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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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