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Segmented Information (Segment assets and liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Total Assets $ 3,621.5 $ 3,636.5
Total liabilities 885.9 785.0
Operating segments [member] | Young-Davidson [Member]    
Disclosure of operating segments [line items]    
Total Assets 1,684.5 1,652.8
Total liabilities 319.3 275.8
Operating segments [member] | Mulatos [Member]    
Disclosure of operating segments [line items]    
Total Assets 539.2 420.9
Total liabilities 155.0 120.1
Operating segments [member] | Island Gold [Member]    
Disclosure of operating segments [line items]    
Total Assets 1,094.1 995.0
Total liabilities 350.5 301.1
Corporate and other [Member]    
Disclosure of operating segments [line items]    
Total Assets 303.7 567.8
Total liabilities $ 61.1 $ 88.0