v3.26.1
Other financial liabilities (Tables)
 12 Months Ended
Dec. 31, 2025
Disclosure of financial liabilities [abstract]  
Disclosure of detailed information about financial liabilities [Table Text Block]
    Dec. 31, 2025     Dec. 31, 2024  
Current            
Derivative liabilities $ 31.9   $ 0.3  
Equipment financing   26.2     16.3  
Deferred Copper Mountain acquisition consideration   3.0     -  
Agreements with communities recorded at amortized cost   61.8     21.7  
    122.9     38.3  
             
Non-current            
Equipment financing   66.0     60.4  
Agreements with communities recorded at amortized cost   44.1     46.7  
Deferred Copper Mountain acquisition consideration   14.4     -  
Contingent Copper Mountain acquisition consideration   13.9     -  
Wheaton refund liability   7.9     7.3  
Other financial liability   8.7     -  
    155.0     114.4  
  $ 277.9   $ 152.7  
Disclosure of detailed information about changes in financial liabilities at amortized cost [Table Text Block]
Balance, January 1, 2024 $ 54.9  
Net additions   18.6  
Disbursements   (9.1 )
Accretion (note 6h)   4.7  
Effects of changes in foreign exchange   (0.7 )
Balance, December 31, 2024 $ 68.4  
Net additions   39.5  
Disbursements   (17.5 )
Accretion (note 6h)   6.4  
Effects of changes in foreign exchange   9.1  
Balance, December 31, 2025 $ 105.9