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Mineral Property, Plant and Equipment (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Apr. 03, 2024
USD ($)
shares
Apr. 03, 2024
USD ($)
$ / shares
shares
May 23, 2023
USD ($)
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
Disclosure of detailed information about property, plant and equipment [line items]                
Reversal of impairment expense       $ 57.1        
Share price (cad per share) | $ / shares           $ 26.52   $ 17.74
Depreciation, right-of-use assets         $ 6.2      
Interest capitalized to mineral, property, plant and equipment         $ 7.7   $ 0.0  
Capitalisation rate of borrowing costs eligible for capitalisation         7.03%      
Construction in progress         $ 417.9 $ 417.9 299.0 $ 299.0
Phase 3+ Expansion Project                
Disclosure of detailed information about property, plant and equipment [line items]                
Interest capitalized to mineral, property, plant and equipment         $ 11.3   $ 0.0  
Capitalisation rate of borrowing costs eligible for capitalisation         7.04%      
Right of Use Assets                
Disclosure of detailed information about property, plant and equipment [line items]                
Right-of-use assets         $ (41.5) $ (41.5)    
Orford Mining Corporation                
Disclosure of detailed information about property, plant and equipment [line items]                
Number of shares iss | shares 0.005588              
Number of shares in entity held by entity (in shares) | shares 61,660,902 61,660,902            
Percentage of shares held by entity 27.50%              
Common shares issued as part of consideration | shares 908,689 908,689            
Share price (cad per share) | $ / shares   $ 19.87            
Total consideration $ 20.7 $ 20.7            
Transaction costs $ 1.0              
Manitou Gold Inc.                
Disclosure of detailed information about property, plant and equipment [line items]                
Total consideration     $ 16.7          
Transaction costs     $ 0.2          
Number of Alamos shares for each Manitou share held | shares     0.0035251          
Ownership interest (in shares) | shares     65,211,077          
Ownership interest, common stock (percentage)     0.19          
Weighted average cost of capital, measurement input [member]                
Disclosure of detailed information about property, plant and equipment [line items]                
Weighted average cost of capital         0.05 0.05