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Deconsolidation of Osisko Development and discontinued operations - Disclosure of estimated useful life of property and equipment in discontinued operations (Details)
 12 Months Ended
Dec. 31, 2022
Leasehold improvements [Member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Useful life of property, plant and equipment Lease term
Right-of-use assets [Member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Useful life of property, plant and equipment Shorter of useful life and lease term
Osisko Development, discontinued operations [Member] | Leasehold improvements [Member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Useful life of property, plant and equipment Lease term
Osisko Development, discontinued operations [Member] | Furniture and office equipment [Member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Useful life of property, plant and equipment 2-7 years
Osisko Development, discontinued operations [Member] | Exploration equipment and facilities [Member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Useful life of property, plant and equipment 2-20 years
Osisko Development, discontinued operations [Member] | Mining plant and equipment (development) [Member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Useful life of property, plant and equipment 3-20 years
Osisko Development, discontinued operations [Member] | Right-of-use assets [Member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Useful life of property, plant and equipment Shorter of useful life and lease term