XML 176 R87.htm IDEA: XBRL DOCUMENT v3.22.0.1
IMPAIRMENT CHARGES, NET OF REVERSAL - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / oz
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items]      
Price of gold, year one and two ($ per ounce) | $ / oz 1,750    
Price of gold, year three to year four ($ per ounce) | $ / oz 1,700    
Price of gold, thereafter ($ per ounce) | $ / oz 1,500    
Value of un-modeled mineralization for cash generating units ($ per ounce) | $ / oz 45    
Impairment charge $ 205.1 $ (45.8)  
Property, plant and equipment 2,587.9 2,362.0  
IAMGOLD Essakane S.A. ("Essakane S.A.")      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Reversal of impairment loss recognised in profit or loss   45.8  
IAMGOLD Essakane S.A. ("Essakane S.A.") | Plant and equipment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment charge $ 0.0 (45.8)  
Rosebel CGU      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Real weighted average costs of capital 0.070    
Rosebel CGU | Plant and equipment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Recoverable amount $ 373.8    
Impairment charge 205.1    
Post tax impairment charge $ 132.9    
Doyon division including the Westwood mine2      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Real weighted average costs of capital 0.070    
Côté Gold Project      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Real weighted average costs of capital 0.055    
Plant and equipment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Property, plant and equipment $ 559.3 642.6  
Cost      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Property, plant and equipment 6,470.1 5,790.2 $ 5,497.3
Cost | Plant and equipment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Property, plant and equipment 1,977.9 $ 1,966.6 $ 1,964.0
Cost | Plant and equipment | IAMGOLD Essakane S.A. ("Essakane S.A.")      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Property, plant and equipment $ 701.6