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Shareholders' Equity - Common Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Shareholders' equity    
Shares issued 191,892,691  
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding at beginning of period 191,334,392  
Number of shares outstanding at end of period 191,892,691 191,334,392
Reconciliation Of Amount Of Shares Outstanding [Abstract]    
Balance at the beginning period $ 5,628.5  
Exercise of stock options 9.5 $ 0.4
Dividend reinvestment plan 48.2 41.8
Balance at the ending period $ 5,695.3 $ 5,628.5
Common shares    
Shareholders' equity    
Shares, par value (dollars per share) $ 0  
Preferred shares    
Shareholders' equity    
Shares issued 0  
Share capital    
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding at beginning of period 191,334,392 190,956,476
Exercise of stock options 148,295 5,614
Vesting of restricted share units 49,919 58,457
Dividend reinvestment plan 360,085 313,845
Number of shares outstanding at end of period 191,892,691 191,334,392
Reconciliation Of Amount Of Shares Outstanding [Abstract]    
Balance at the beginning period $ 5,628.5 $ 5,580.1
Exercise of stock options 12.2 0.5
Vesting of restricted share units 6.4 6.1
Dividend reinvestment plan 48.2 41.8
Balance at the ending period $ 5,695.3 $ 5,628.5