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Segmented Information (Segment assets and liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]    
Total Assets $ 5,336.1 $ 4,001.2
Total liabilities 1,751.9 1,077.7
Corporate/Other    
Disclosure of operating segments [line items]    
Total Assets 280.0 222.9
Total liabilities 559.3 46.8
Operating segments | Young-Davidson    
Disclosure of operating segments [line items]    
Total Assets 1,758.6 1,693.2
Total liabilities 459.8 381.8
Operating segments | Island Gold    
Disclosure of operating segments [line items]    
Total Assets 1,683.1 1,453.6
Total liabilities 534.5 476.4
Operating segments | Magino    
Disclosure of operating segments [line items]    
Total Assets 1,073.5 0.0
Total liabilities 37.9 0.0
Operating segments | Mulatos    
Disclosure of operating segments [line items]    
Total Assets 540.9 631.5
Total liabilities $ 160.4 $ 172.7