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Cover
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2021
Current Fiscal Year End Date --12-31
Entity File Number 001-31528
Entity Registrant Name IAMGOLD CORPORATION
Entity Central Index Key 0001203464
Amendment Flag false
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Entity Incorporation, State or Country Code Z4
Entity Primary SIC Number 1040
Entity Address, Address Line One 401 Bay Street
Entity Address, Address Line Two Suite 3200
Entity Address, Address Line Three P.O. Box 153
Entity Address, City or Town Toronto
Entity Address, State or Province ON
Entity Address, Postal Zip Code M5H 2Y4
City Area Code 416
Local Phone Number 360-4710
Title of 12(b) Security Common Shares, no par value
Trading Symbol IAG
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding 476,987,263
Business Contact  
Document Information [Line Items]  
Contact Personnel Name DL Services, Inc.
Entity Address, Address Line One 701 5th Avenue
Entity Address, Address Line Two Suite 6100
Entity Address, City or Town Seattle
Entity Address, State or Province WA
Entity Address, Postal Zip Code 98104
City Area Code 206
Local Phone Number 903-8800