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Mineral Property, Plant and Equipment (Narrative) (Details)
$ in Millions
 12 Months Ended
May 23, 2023
USD ($)
shares
May 23, 2023
USD ($)
$ / shares
shares
Feb. 28, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]            
Construction in progress       $ 299.0 $ 155.8  
Cash and cash equivalents       224.8 129.8 $ 172.5
Total financial instrument exposure to credit risk       242.6 153.5  
Milestone payments       5.7 19.1  
Concentrate Receivable            
Disclosure of detailed information about property, plant and equipment [line items]            
Milestone payments         $ 19.1  
Esperanza Project            
Disclosure of detailed information about property, plant and equipment [line items]            
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations     $ 60.0      
Cash and cash equivalents     $ 5.0      
Manitou Gold Inc.            
Disclosure of detailed information about property, plant and equipment [line items]            
Number of Alamos shares for each Manitou share held | shares 0.0035251 0.0035251        
Ownership interest (in shares) | shares 65,211,077 65,211,077        
Ownership interest, common stock (percentage) 0.19 0.19        
Common shares issued as part of consideration | shares 984,760 984,760        
Common shares as payment for control obligations | shares 60,833 60,833        
Share price (cad per share) | $ / shares   $ 17.37        
Consideration transferred, acquisition-date fair value $ 16.7 $ 16.7   16.7    
Transaction costs $ 0.2     $ 0.2