v3.25.2
Shareholders' Equity - Common Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Amount          
Balance at the beginning year     $ 5,769.1    
Exercise of stock options     4.3 $ 2.7  
Dividend reinvestment plan $ 5.9 $ 9.3 9.1 $ 19.8  
Balance at the ending year $ 5,789.2   $ 5,789.2   $ 5,769.1
Common shares          
Shareholders' Equity          
Shares issued 192,701,088   192,701,088    
Shares outstanding 192,701,088   192,701,088    
Shares, par value (dollars per share) $ 0   $ 0    
Number of shares          
Number of shares outstanding at end of year 192,701,088   192,701,088    
Preferred shares          
Shareholders' Equity          
Shares issued 0   0    
Share capital          
Shareholders' Equity          
Shares outstanding 192,701,088   192,701,088   192,552,695
Number of shares          
Number of shares outstanding at beginning of year     192,552,695 192,175,042 192,175,042
Exercise of stock options     59,249   71,864
Vesting of restricted share units     32,073   18,340
Dividend reinvestment plan     57,071   287,449
Number of shares outstanding at end of year 192,701,088   192,701,088   192,552,695
Amount          
Balance at the beginning year     $ 5,769.1 $ 5,728.2 $ 5,728.2
Exercise of stock options     5.5 3.5 3.6
Vesting of restricted share units     5.5 2.4 2.7
Dividend reinvestment plan     9.1 $ 19.8 34.6
Balance at the ending year $ 5,789.2   $ 5,789.2   $ 5,769.1