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LONG-TERM DEBT AND CREDIT FACILITY - Roll forward of Available Amount Under Credit Facility (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 20, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Financial Instruments [Abstract] |  |  |
Available amount under Credit Facility, beginning of year |  | $ 387.0 | $ 26.6
Increase (decrease) in available amount under Credit Facility |  | 225.0 | (75.0)
Draws | $ (220.0) | (280.0) | 0.0
Repayments |  | 60.0 | 455.0
Increase (decrease) in letters of credit |  | 26.5 | (19.6)
Available amount under Credit Facility, end of year |  | $ 418.5 | $ 387.0

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- Definition Borrowing Facilities, Maximum Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | iag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financial Instruments [Abstract] + References No definition available. + Details
Name: | iag_FinancialInstrumentsAbstract
Namespace Prefix: | iag_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase (Decrease) in Borrowing Facilities + References No definition available. + Details
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Namespace Prefix: | iag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (decrease) in Letters of Credit + References No definition available. + Details
Name: | iag_IncreaseDecreaseInLettersOfCredit
Namespace Prefix: | iag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash inflow from non-current borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow for repayments of current borrowings. [Refer: Current borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration