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EARNINGS PER SHARE - Antidilutive Securities (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Options
Earnings per share [line items]
Antidilutive securities (in shares)	0.2	5.2

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- Definition

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount1

+ References

No definition available.

+ Details

Name:	iag_AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareAmount1
Namespace Prefix:	iag_
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

Name:	ifrs-full_EarningsPerShareLineItems
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: