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Shareholders equity - Common Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding at beginning of period 190,956,476  
Number of shares outstanding at end of period 191,334,392 190,956,476
Reconciliation Of Amount Of Shares Outstanding [Abstract]    
Balance at the beginning period $ 5,580.1  
At-the-market equity offering   $ 133.7
Amount of Exercise of stock options 0.4 7.4
Dividend reinvestment plan 41.8 42.3
Balance at the ending period $ 5,628.5 $ 5,580.1
Common shares    
Shareholders' equity    
Shares issued 191,334,392  
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 190,956,476 189,381,388
At-the-market equity offering   1,054,800
Exercise of stock options 5,614 150,482
Vesting of restricted share units 58,457 42,328
Dividend reinvestment plan 313,845 327,478
Number of shares outstanding at end of period 191,334,392 190,956,476
Reconciliation Of Amount Of Shares Outstanding [Abstract]    
Balance at the beginning period $ 5,580.1 $ 5,390.7
At-the-market equity offering   133.7
Amount of Exercise of stock options 0.5 9.7
Amount of Vesting of restricted share units 6.1 3.7
Dividend reinvestment plan 41.8 42.3
Balance at the ending period $ 5,628.5 $ 5,580.1