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NON-CONTROLLING INTERESTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of consolidated [line items]    
Accumulated non-controlling interest $ 77.3 $ 87.3
Net earnings (loss) attributable to non-controlling interests (0.7) 16.2
Current assets 951.1 1,395.5
Total non- current assets 3,020.5 2,758.8
Current liabilities (581.7) (334.8)
Non-current liabilities (1,072.8) (1,274.0)
Revenues 1,151.7 1,241.7
Net earnings (loss) and OCI (209.4) 96.0
Net cash from (used in) operating activities 285.0 347.6
Net cash used in investing activities (630.7) (246.2)
Net cash from (used in) financing activities (41.2) 0.8
Increase (decrease) in cash and cash equivalents $ (396.6) $ 110.9
IAMGOLD Essakane S.A. ("Essakane S.A.")    
Disclosure of consolidated [line items]    
Percentage of voting rights held by non-controlling interests 10.00% 10.00%
Accumulated non-controlling interest $ 59.2 $ 55.2
Net earnings (loss) attributable to non-controlling interests 7.1 13.0
Dividends paid to non-controlling interests 3.1 0.5
Current assets 294.4 355.6
Total non- current assets 849.7 975.1
Current liabilities (128.9) (130.6)
Non-current liabilities (257.4) (480.8)
Net assets 757.8 719.3
Revenues 816.3 715.0
Net earnings (loss) and OCI 69.3 128.5
Net cash from (used in) operating activities 388.5 252.0
Net cash used in investing activities (142.2) (120.3)
Net cash from (used in) financing activities (263.9) (105.8)
Increase (decrease) in cash and cash equivalents $ (17.6) $ 25.9
Rosebel Gold Mines N.V.    
Disclosure of consolidated [line items]    
Percentage of voting rights held by non-controlling interests 5.00% 5.00%
Accumulated non-controlling interest $ 14.4 $ 27.3
Net earnings (loss) attributable to non-controlling interests (8.6) 1.6
Dividends paid to non-controlling interests 4.3 0.0
Current assets 144.2 304.5
Total non- current assets 569.6 697.6
Current liabilities (98.6) (92.0)
Non-current liabilities (275.3) (312.1)
Net assets 339.9 598.0
Revenues 277.2 380.5
Net earnings (loss) and OCI (173.0) 31.8
Net cash from (used in) operating activities 32.9 144.5
Net cash used in investing activities (101.5) (19.4)
Net cash from (used in) financing activities (63.5) (18.6)
Increase (decrease) in cash and cash equivalents $ (132.1) $ 106.5
Boto    
Disclosure of consolidated [line items]    
Percentage of voting rights held by non-controlling interests 10.00% 10.00%
Accumulated non-controlling interest $ 0.2 $ 0.3
Net earnings (loss) attributable to non-controlling interests (0.1) 0.0
Dividends paid to non-controlling interests 0.0 0.0
Current assets 2.6 5.1
Total non- current assets 61.8 25.3
Current liabilities (2.7) (7.4)
Non-current liabilities (58.7) (19.4)
Net assets 3.0 3.6
Revenues 0.0 0.0
Net earnings (loss) and OCI (0.7) 0.0
Net cash from (used in) operating activities (0.6) (0.1)
Net cash used in investing activities (33.7) (14.3)
Net cash from (used in) financing activities 32.1 19.4
Increase (decrease) in cash and cash equivalents (2.2) 5.0
Subsidiaries with non-material non-controlling Interests    
Disclosure of consolidated [line items]    
Dividends paid to non-controlling interests $ 1.9 $ 1.4