v3.26.1
Revenue and expenses (Schedule of detailed information about employee benefits expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Revenue and Expenses [Line Items]    
Current employee benefits $ 239.4 $ 239.2
Profit-sharing plan expense 82.1 51.1
Share-based compensation 61.3 19.3
Employee share purchase plan 2.1 1.8
Defined benefit plans 4.7 4.4
Defined contribution plans 2.5 2.1
Past service cost 0.0 4.3
Other post-retirement employee benefits 6.0 7.5
Termination benefits 0.7 1.7
Employee benefits expense 398.8 331.4
Equity settled stock options [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation 2.5 2.1
Cash-settled restricted share units [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation 20.3 6.7
Cash-settled deferred share units [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation 13.9 6.3
Cash-settled performance share units [Member]    
Revenue and Expenses [Line Items]    
Share-based compensation $ 24.6 $ 4.2