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EARNINGS (LOSS) PER SHARE - Earnings (Loss) per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Numerator    
Net earnings (loss) from continuing operations attributable to equity holders $ (254.4) $ 38.5
Net earnings from discontinued operations attributable to equity holders 0.0 4.1
Net earnings (loss) attributable to equity holders $ (254.4) $ 42.6
Denominator    
Weighted average number of common shares (basic) 476.5 472.6
Basic earnings (loss) from continuing operations attributable to equity holders of IAMGOLD per share (in dollars per share) $ (0.53) $ 0.08
Basic earnings (loss) from discontinued operations attributable to equity holders of IAMGOLD per share (in dollars per share) 0 0.01
Basic earnings (loss) per share (in dollars per share) $ (0.53) $ 0.09