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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Reconciliation Of Amount Of Shares Outstanding [Abstract]          
Balance at the beginning period     $ 5,628.5    
Exercise of stock options     5.2 $ 0.3  
Dividend reinvestment plan $ 9.7 $ 11.4 21.8 $ 19.5  
Balance at the ending period $ 5,657.0   $ 5,657.0   $ 5,628.5
Common shares          
Shareholders' equity          
Shares issued 191,556,373   191,556,373    
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     191,334,392 190,956,476 190,956,476
Exercise of stock options     71,741   5,614
Vesting of restricted share units         58,457
Dividend reinvestment plan     150,240   313,845
Number of shares outstanding at end of period 191,556,373   191,556,373   191,334,392
Reconciliation Of Amount Of Shares Outstanding [Abstract]          
Balance at the beginning period     $ 5,628.5 $ 5,580.1 $ 5,580.1
Exercise of stock options     6.7 0.4 0.5
Vesting of restricted share units         6.1
Dividend reinvestment plan     21.8 $ 19.5 41.8
Balance at the ending period $ 5,657.0   $ 5,657.0   $ 5,628.5