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Shareholders' Equity - Common Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Shareholders' equity    
Shares issued 192,175,042  
Number of shares outstanding at beginning of period 191,892,691  
Number of shares outstanding at end of period 192,175,042 191,892,691
Balance at the beginning period $ 5,695.3  
Exercise of stock options 2.9 $ 9.5
Dividend reinvestment plan 29.1 48.2
Balance at the ending period $ 5,728.2 $ 5,695.3
Common shares    
Shareholders' equity    
Shares, par value (dollars per share) $ 0  
Preferred shares    
Shareholders' equity    
Shares issued 0  
Share capital    
Shareholders' equity    
Number of shares outstanding at beginning of period 191,892,691 191,334,392
Exercise of stock options 61,000 148,295
Vesting of restricted share units   49,919
Dividend reinvestment plan 221,351 360,085
Number of shares outstanding at end of period 192,175,042 191,892,691
Balance at the beginning period $ 5,695.3 $ 5,628.5
Exercise of stock options 3.8 12.2
Vesting of restricted share units   6.4
Dividend reinvestment plan 29.1 48.2
Balance at the ending period $ 5,728.2 $ 5,695.3