v3.26.1
Revenue and expenses (Schedule of detailed information about share-based expense (recoveries) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Revenue and Expenses [Line Items]    
Share-based compensation expenses $ 61.3 $ 19.3
Cost of sales [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 5.9 2.0
Selling and administrative expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 53.9 16.6
Other expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 1.5 0.7
RSUs [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 20.3 6.7
RSUs [Member] | Cost of sales [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 5.9 2.0
RSUs [Member] | Selling and administrative expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 12.9 4.0
RSUs [Member] | Other expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 1.5 0.7
DSUs [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 13.9 6.3
DSUs [Member] | Cost of sales [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 0.0 0.0
DSUs [Member] | Selling and administrative expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 13.9 6.3
DSUs [Member] | Other expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 0.0 0.0
PSUs [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 24.6 4.2
PSUs [Member] | Cost of sales [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 0.0 0.0
PSUs [Member] | Selling and administrative expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 24.6 4.2
PSUs [Member] | Other expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 0.0 0.0
Stock Options [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 2.5 2.1
Stock Options [Member] | Cost of sales [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 0.0 0.0
Stock Options [Member] | Selling and administrative expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses 2.5 2.1
Stock Options [Member] | Other expenses [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation expenses $ 0.0 $ 0.0