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Mineral Property, Plant and Equipment (Net Value Carrying Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 4,618.0 $ 3,360.1
Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 4,618.0 3,360.1
Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 420.4 367.9
Corporate/Other | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 229.6 169.1
Corporate/Other | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 26.6 21.1
Operating segments | Young-Davidson | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 1,563.3 1,500.3
Operating segments | Young-Davidson | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 87.5 73.5
Operating segments | Island Gold | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 1,596.5 1,397.7
Operating segments | Island Gold | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 258.0 243.4
Operating segments | Mulatos | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 232.7 293.0
Operating segments | Mulatos | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 19.9 29.9
Operating segments | Magino | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 995.9 0.0
Operating segments | Magino | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 28.4 $ 0.0