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SEGMENTED INFORMATION - Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Total non- current assets $ 3,020.5 $ 2,758.8
Total assets 3,971.6 4,154.3
Total liabilities 1,654.5 1,608.8
Gold mines    
Disclosure of operating segments [line items]    
Total non- current assets 1,779.3 2,007.1
Total assets 2,252.1 2,684.9
Total liabilities 851.8 889.3
Gold mines | Burkina Faso    
Disclosure of operating segments [line items]    
Total non- current assets 860.0 976.9
Total assets 1,153.4 1,332.5
Total liabilities 275.4 284.4
Gold mines | Suriname    
Disclosure of operating segments [line items]    
Total non- current assets 579.5 698.5
Total assets 730.0 1,003.4
Total liabilities 315.7 399.0
Gold mines | Canada    
Disclosure of operating segments [line items]    
Total non- current assets 339.8 331.7
Total assets 368.7 349.0
Total liabilities 260.7 205.9
Côté Gold Project    
Disclosure of operating segments [line items]    
Total non- current assets 1,022.8 566.8
Total assets 1,118.1 618.2
Total liabilities 109.0 35.6
Exploration and evaluation and development    
Disclosure of operating segments [line items]    
Total non- current assets 120.0 85.7
Total assets 148.3 234.3
Total liabilities 9.4 11.6
Corporate    
Disclosure of operating segments [line items]    
Total non- current assets 98.4 99.2
Total assets 453.1 616.9
Total liabilities $ 684.3 $ 672.3