[Line Items] for Schedule Of Fair Value, Off-balance Sheet Risks1 [Table]

No definition available.

Name:	iag_ScheduleOfFairValueOffbalanceSheetRisks1LineItems
Namespace Prefix:	iag_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of non-current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NoncurrentRestrictedCashAndCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

+ Details

Name:	ifrs-full_ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=iag_EssakaneS.A.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=iag_WestwoodDivisionAndCoteGoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=iag_WesternwoodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Restricted Cash (Details) $ in Millions, $ in Millions, XOF in Billions	Dec. 31, 2025 USD ($)	Dec. 31, 2025 XOF	Dec. 31, 2025 CAD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 XOF	Dec. 31, 2024 CAD ($)
Schedule Of Fair Value, Off-balance Sheet Risks1 [Line Items]
Non-current restricted cash	$ 71.0			$ 68.4
Essakane
Schedule Of Fair Value, Off-balance Sheet Risks1 [Line Items]
Non-current restricted cash	68.0	XOF 38.0		54.6	XOF 34.6
Westwood division and Côté Gold
Schedule Of Fair Value, Off-balance Sheet Risks1 [Line Items]
Security for the purchase of shares held by the minority interest shareholders of EURO				11.0
Westwood division
Schedule Of Fair Value, Off-balance Sheet Risks1 [Line Items]
Security for the purchase of shares held by the minority interest shareholders of EURO	$ 3.0		$ 4.1	$ 2.8		$ 4.1