v3.25.4
Shareholders' Equity - Common Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Shareholders' Equity    
Shares outstanding 192,798,692 192,552,695
Number of shares    
Number of shares outstanding at beginning of year 192,552,695  
Number of shares outstanding at end of year 192,798,692 192,552,695
Amount    
Balance at the beginning year $ 5,769.1  
Exercise of stock options 7.7 $ 2.8
Dividend reinvestment plan 18.7 34.6
Balance at the ending year $ 5,803.4 $ 5,769.1
Common shares    
Shareholders' Equity    
Shares issued 192,798,692  
Shares outstanding 192,798,692  
Shares, par value (dollars per share) $ 0  
Number of shares    
Number of shares outstanding at end of year 192,798,692  
Preferred shares    
Shareholders' Equity    
Shares issued 0  
Share capital    
Shareholders' Equity    
Shares outstanding 192,798,692 192,552,695
Number of shares    
Number of shares outstanding at beginning of year 192,552,695 192,175,042
Exercise of stock options 110,917 71,864
Vesting of restricted share units 33,274 18,340
Dividend reinvestment plan 101,806 287,449
Number of shares outstanding at end of year 192,798,692 192,552,695
Amount    
Balance at the beginning year $ 5,769.1 $ 5,728.2
Exercise of stock options 9.9 3.6
Vesting of restricted share units 5.7 2.7
Dividend reinvestment plan 18.7 34.6
Balance at the ending year $ 5,803.4 $ 5,769.1