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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

X

- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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