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LONG-TERM DEBT AND CREDIT FACILITY - Credit Facilities (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Feb. 26, 2020
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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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