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Shareholders' Equity - Common Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Amount          
Balance at the beginning period     $ 5,728.2    
Exercise of stock options     2.7 $ 2.9  
Dividend reinvestment plan $ (9.3) $ (6.9) (19.8) $ (14.5)  
Balance at the ending period $ 5,753.9   $ 5,753.9   $ 5,728.2
Common shares          
Shareholders' Equity          
Shares issued 192,426,697   192,426,697    
Shares, par value (dollars per share) $ 0   $ 0    
Preferred shares          
Shareholders' Equity          
Shares issued 0   0    
Share capital          
Number of shares          
Number of shares outstanding at beginning of period     192,175,042 191,892,691 191,892,691
Exercise of stock options     69,432   61,000
Vesting of restricted share units     16,640    
Dividend reinvestment plan     165,583   221,351
Number of shares outstanding at end of period 192,426,697   192,426,697   192,175,042
Amount          
Balance at the beginning period     $ 5,728.2 $ 5,695.3 $ 5,695.3
Exercise of stock options     3.5 3.8 3.8
Vesting of restricted share units     (2.4)    
Dividend reinvestment plan     (19.8) $ (14.5) (29.1)
Balance at the ending period $ 5,753.9   $ 5,753.9   $ 5,728.2