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LEASES - Lease liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of leases [Roll Forward] |  |
Balance, beginning of year | $ 73.8 | $ 65.6
Additions | 79.7 | 72.1
Interest expense | 7.5 | 3.1
Foreign exchange impact | 1.0 | (2.9)
Principal lease payments | (6.0) | (21.3)
Interest payments | (5.3) | (3.3)
UJV lease adjustment | (29.4) | 0.0
Reclassification of Rosebel mine leases to liabilities held for sale | 0.0 | (39.5)
Balance, end of year | 121.3 | 73.8
Current portion | 21.1 | 5.1
Non-current portion | 100.2 | 68.7
Lease obligations | $ 121.3 | $ 73.8

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- Definition Disclosure of leases [Roll Forward] + References No definition available. + Details
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- Definition Foreign Exchange Gain (Loss) on Lease + References No definition available. + Details
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Namespace Prefix: | iag_
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- Definition Interest Payments Of Lease Liabilities + References No definition available. + Details
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Balance Type: | credit
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- Definition Joint Operation Lease Adjustment + References No definition available. + Details
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- Definition Principle Payments of Lease Liabilities + References No definition available. + Details
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- Definition Reclassification of Existing Finance Lease + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_h&doctype=Standard -URIDate 2023-03-23 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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