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Shareholders' Equity - Common Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Number of shares    
Number of shares outstanding at beginning of year 192,175,042  
Number of shares outstanding at end of year 192,552,695 192,175,042
Amount    
Balance at the beginning year $ 5,728.2  
Exercise of stock options 2.8 $ 2.9
Dividend reinvestment plan (34.6) (29.1)
Balance at the ending year $ 5,769.1 $ 5,728.2
Common shares    
Shareholders' Equity    
Shares issued 192,552,695  
Shares, par value (dollars per share) $ 0  
Preferred shares    
Shareholders' Equity    
Shares issued 0  
Share capital    
Number of shares    
Number of shares outstanding at beginning of year 192,175,042 191,892,691
Exercise of stock options 71,864 61,000
Vesting of restricted share units 18,340  
Dividend reinvestment plan 287,449 221,351
Number of shares outstanding at end of year 192,552,695 192,175,042
Amount    
Balance at the beginning year $ 5,728.2 $ 5,695.3
Exercise of stock options 3.6 3.8
Vesting of restricted share units (2.7)  
Dividend reinvestment plan (34.6) (29.1)
Balance at the ending year $ 5,769.1 $ 5,728.2