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Mineral Property, Plant and Equipment (Net Value Carrying Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 3,360.1 $ 3,173.8
Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 3,360.1 3,173.8
Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 367.9 329.8
Corporate and other | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 169.1 150.7
Corporate and other | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 21.1 17.5
Operating segments | Young-Davidson | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 1,500.3 1,504.7
Operating segments | Young-Davidson | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 73.5 68.4
Operating segments | Island Gold | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 1,397.7 1,174.6
Operating segments | Island Gold | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 243.4 185.1
Operating segments | Mulatos1 | Mineral Property, Plant and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 293.0 343.8
Operating segments | Mulatos1 | Capital Additions    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 29.9 $ 58.8