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LONG-TERM DEBT AND CREDIT FACILITY - Credit Facilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 26, 2020
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Disclosure of detailed information about borrowings [line items] |  |  |
Outstanding borrowing amount | $ 1,700,000 | $ 1,700,000 |
Credit Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Maximum borrowing capacity |  |  | $ 500,000,000
Credit Facility Due 2024 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Maximum borrowing capacity |  |  | $ 490,000,000

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- Definition Borrowings, Credit Facility, Committed Amount + References No definition available. + Details
Name: | iag_BorrowingsCreditFacilityCommittedAmount
Namespace Prefix: | iag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Maximum Borrowing Capacity + References No definition available. + Details
Name: | iag_LineofCreditFacilityMaximumBorrowingCapacity1
Namespace Prefix: | iag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=iag_February2016FourYearCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=iag_CreditFacilityDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |