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SEGMENTED INFORMATION - Statement of Earnings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]    
Revenues $ 987.1 $ 958.8
Cost of sales 647.0 570.4
Depreciation expense 216.0 240.5
General and administrative 48.6 52.0
Exploration 26.3 28.4
Impairment 0.0 17.1
Other 49.5 9.1
Earnings (loss) from operations (0.3) 41.3
Net capital expenditures 934.2 766.0
Discontinued operations    
Disclosure of operating segments [line items]    
Revenues 47.2 405.2
Cost of sales 23.8 286.8
Depreciation expense 0.0 43.9
General and administrative 0.0 3.5
Exploration 0.1 1.2
Impairment 0.0 110.1
Other 1.3 2.5
Earnings (loss) from operations 22.0 (42.8)
Net capital expenditures 10.8 116.7
Aggregate continuing and discontinued operations    
Disclosure of operating segments [line items]    
Revenues 1,034.3 1,364.0
Cost of sales 670.8 857.2
Depreciation expense 216.0 284.4
General and administrative 48.6 55.5
Exploration 26.4 29.6
Impairment 0.0 127.2
Other 50.8 11.6
Earnings (loss) from operations 21.7 (1.5)
Net capital expenditures 945.0 882.7
Operating gold mines    
Disclosure of operating segments [line items]    
Revenues 986.2 1,003.9
Cost of sales 647.0 570.4
Depreciation expense 214.9 240.1
General and administrative 0.0 0.0
Exploration 0.0 0.2
Impairment 0.0 11.5
Other 42.0 3.6
Earnings (loss) from operations 82.3 178.1
Net capital expenditures 202.2 200.0
Operating gold mines | Burkina Faso    
Disclosure of operating segments [line items]    
Revenues 809.6 883.3
Cost of sales 502.4 431.2
Depreciation expense 183.6 220.2
General and administrative 0.0 0.0
Exploration 0.0 0.2
Impairment 0.0 11.5
Other 31.6 0.7
Earnings (loss) from operations 92.0 219.5
Net capital expenditures 136.6 163.2
Operating gold mines | Canada    
Disclosure of operating segments [line items]    
Revenues 176.6 120.6
Cost of sales 144.6 139.2
Depreciation expense 31.3 19.9
General and administrative 0.0 0.0
Exploration 0.0 0.0
Impairment 0.0 0.0
Other 10.4 2.9
Earnings (loss) from operations (9.7) (41.4)
Net capital expenditures 65.6 36.8
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 0.4 1.3
Exploration 4.2 3.0
Impairment 0.0 0.0
Other 1.0 0.0
Earnings (loss) from operations (5.6) (4.3)
Net capital expenditures 731.6 551.8
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 0.0 0.2
Exploration 22.1 25.2
Impairment 0.0 0.0
Other 0.2 3.3
Earnings (loss) from operations (22.3) (28.7)
Net capital expenditures 0.0 13.1
Corporate    
Disclosure of operating segments [line items]    
Revenues 0.9 (45.1)
Cost of sales 0.0 0.0
Depreciation expense 1.1 0.4
General and administrative 48.2 50.5
Exploration 0.0 0.0
Impairment 0.0 5.6
Other 6.3 2.2
Earnings (loss) from operations (54.7) (103.8)
Net capital expenditures $ 0.4 $ 1.1