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EARNINGS PER SHARE - Antidilutive Securities (Details) - shares shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Earnings per share [line items] |  |
Antidilutive securities (in shares) | 5.2 | 11.0
Options |  |
Earnings per share [line items] |  |
Antidilutive securities (in shares) | 5.2 | 4.7
Share units |  |
Earnings per share [line items] |  |
Antidilutive securities (in shares) | 0.0 | 6.3

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- Definition Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount1 + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | iag_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities1Axis=iag_EmployeeStockOption1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | iag_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities1Axis=iag_RestrictedStockOption1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |