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SEGMENTED INFORMATION - Statement of Earnings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Revenues $ 1,151.7 $ 1,241.7
Cost of sales 809.2 734.7
Depreciation expense 339.8 256.7
General and administrative 42.0 46.8
Exploration 38.1 27.9
Impairment (Reversal) 205.1 (45.8)
Other 92.0 76.0
Earnings (loss) from operations (374.5) 145.4
Net capital expenditures 625.7 292.7
Gold mines    
Disclosure of operating segments [line items]    
Revenues 1,151.7 1,241.7
Cost of sales 809.2 734.7
Depreciation expense 338.5 255.0
General and administrative 0.0 0.0
Exploration 4.2 3.4
Impairment (Reversal) 190.1 (45.8)
Other 86.9 72.5
Earnings (loss) from operations (277.2) 221.9
Net capital expenditures 248.5 202.7
Gold mines | Burkina Faso    
Disclosure of operating segments [line items]    
Revenues 813.9 715.0
Cost of sales 472.1 408.0
Depreciation expense 251.6 166.7
General and administrative 0.0 0.0
Exploration 1.2 0.0
Impairment (Reversal) 0.0 (45.8)
Other 5.6 14.8
Earnings (loss) from operations 83.4 171.3
Net capital expenditures 135.6 113.7
Gold mines | Suriname    
Disclosure of operating segments [line items]    
Revenues 276.2 380.5
Cost of sales 260.1 231.1
Depreciation expense 75.6 70.8
General and administrative 0.0 0.0
Exploration 3.0 3.4
Impairment (Reversal) 190.1 0.0
Other 14.1 28.7
Earnings (loss) from operations (266.7) 46.5
Net capital expenditures 98.6 67.8
Gold mines | Canada    
Disclosure of operating segments [line items]    
Revenues 61.6 146.2
Cost of sales 77.0 95.6
Depreciation expense 11.3 17.5
General and administrative 0.0 0.0
Exploration 0.0 0.0
Impairment (Reversal) 0.0 0.0
Other 67.2 29.0
Earnings (loss) from operations (93.9) 4.1
Net capital expenditures 14.3 21.2
Côté Gold Project    
Disclosure of operating segments [line items]    
Revenues 0.0 0.0
Cost of sales 0.0 0.0
Depreciation expense 0.0 0.0
General and administrative 0.9 0.0
Exploration 2.9 2.7
Impairment (Reversal) 0.0 0.0
Other 0.0 0.0
Earnings (loss) from operations (3.8) (2.7)
Net capital expenditures 343.0 73.1
Exploration and evaluation and development    
Disclosure of operating segments [line items]    
Revenues 0.0 0.0
Cost of sales 0.0 0.0
Depreciation expense 0.0 0.0
General and administrative 0.3 0.0
Exploration 31.0 21.8
Impairment (Reversal) 0.0 0.0
Other 0.4 0.7
Earnings (loss) from operations (31.7) (22.5)
Net capital expenditures 33.6 16.1
Corporate    
Disclosure of operating segments [line items]    
Revenues 0.0 0.0
Cost of sales 0.0 0.0
Depreciation expense 1.3 1.7
General and administrative 40.8 46.8
Exploration 0.0 0.0
Impairment (Reversal) 15.0 0.0
Other 4.7 2.8
Earnings (loss) from operations (61.8) (51.3)
Net capital expenditures $ 0.6 $ 0.8