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Segmented Information (Segment assets and liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]    
Total Assets $ 3,674.2 $ 3,621.5
Total liabilities 953.1 885.9
Corporate and other    
Disclosure of operating segments [line items]    
Total Assets 200.8 283.4
Total liabilities 41.3 61.1
Operating segments | Young-Davidson    
Disclosure of operating segments [line items]    
Total Assets 1,644.9 1,684.5
Total liabilities 353.2 319.3
Operating segments | Mulatos1    
Disclosure of operating segments [line items]    
Total Assets 606.0 539.2
Total liabilities 143.1 155.0
Operating segments | Island Gold    
Disclosure of operating segments [line items]    
Total Assets 1,222.5 1,114.4
Total liabilities $ 415.5 $ 350.5