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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Reconciliation Of Amount Of Shares Outstanding [Abstract]          
Balance at the beginning period     $ 5,695.3    
Exercise of stock options     2.9 $ 5.2  
Dividend reinvestment plan $ 6.9 $ 9.7 14.5 $ 21.8  
Balance at the ending period $ 5,713.6   $ 5,713.6   $ 5,695.3
Common shares          
Shareholders' equity          
Shares issued 192,055,603   192,055,603    
Shares, par value (dollars per share) $ 0   $ 0    
Preferred shares          
Shareholders' equity          
Shares issued 0   0    
Share capital          
Reconciliation of number of shares outstanding [abstract]          
Number of shares outstanding at beginning of period     191,892,691 191,334,392 191,334,392
Exercise of stock options     61,000   148,295
Vesting of restricted share units         49,919
Dividend reinvestment plan     101,912   360,085
Number of shares outstanding at end of period 192,055,603   192,055,603   191,892,691
Reconciliation Of Amount Of Shares Outstanding [Abstract]          
Balance at the beginning period     $ 5,695.3 $ 5,628.5 $ 5,628.5
Exercise of stock options     3.8 6.7 12.2
Vesting of restricted share units         6.4
Dividend reinvestment plan     14.5 $ 21.8 48.2
Balance at the ending period $ 5,713.6   $ 5,713.6   $ 5,695.3