v3.26.1
Other investments (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Oct. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
May 31, 2025
Mac Copper [Member]        
Disclosure of detailed information about borrowings [line items]        
Percentage of interests acquired       100.00%
Cash price per share       $ 12.25
Proceeds from disposal $ 49.0      
Shares disposed 4      
Note receivable [Member]        
Disclosure of detailed information about borrowings [line items]        
Loan reclassified to investments     $ 12.2  
Additional funds advanced   $ 1.6    
Net book value of amended note   $ 14.1    
Note interest rate   8.00%    
Bank credit facility   $ 150.0