v3.26.1
Investments in associates - Disclosure of associates reconciliation to carrying amounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Disclosure of associates [line items]        
Other comprehensive gain for the period   $ 93,345 $ (57,822)  
Carrying amount, at lag   43,262    
Carrying amount, as per balance sheet   0 43,262  
Osisko Development Corp. [Member]        
Disclosure of associates [line items]        
Opening net assets, at lag       $ 538,570
Loss for the period       (153,087)
Other comprehensive gain for the period $ 1,100     1,440
Other equity transactions, impact of foreign exchange variations and others       4,863
Closing net assets, at lag       $ 391,786
Company's share in %       39.70%
Company's share in $, at lag       $ 155,539
Initial recognition impairment       (73,039)
Investment impairment       (17,590)
Impact of dilution, foreign exchange variations and others       (12,348)
Carrying amount, at lag   $ 43,262   $ 52,562
Adjustments for events during the lag period     (9,300)  
Carrying amount, as per balance sheet     43,262  
Fair value of investment     $ 54,210