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SEGMENTED INFORMATION - Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]    
Total non- current assets $ 3,784.2 $ 2,903.8
Assets 4,537.9 4,425.1
Total liabilities 2,273.8 2,218.3
Assets held for sale    
Disclosure of operating segments [line items]    
Total non- current assets 0.0 0.0
Assets 34.6 785.6
Total liabilities 5.6 276.3
Operating gold mines    
Disclosure of operating segments [line items]    
Total non- current assets 1,122.3 1,114.8
Assets 1,489.9 1,531.7
Total liabilities 523.9 514.1
Operating gold mines | Burkina Faso    
Disclosure of operating segments [line items]    
Total non- current assets 764.4 798.0
Assets 1,100.4 1,183.0
Total liabilities 274.2 287.7
Operating gold mines | Canada    
Disclosure of operating segments [line items]    
Total non- current assets 357.9 316.8
Assets 389.5 348.7
Total liabilities 249.7 226.4
Côté Gold Project    
Disclosure of operating segments [line items]    
Total non- current assets 2,521.5 1,696.9
Assets 2,638.0 1,821.6
Total liabilities 243.2 209.5
Exploration and evaluation and development    
Disclosure of operating segments [line items]    
Total non- current assets 37.7 18.8
Assets 47.4 22.0
Total liabilities 1.3 1.8
Corporate    
Disclosure of operating segments [line items]    
Total non- current assets 102.7 73.3
Assets 328.0 264.2
Total liabilities $ 1,499.8 $ 1,216.6