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Shareholders' capital - Common Shares (Detail) - shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Common Shares Rollforward    
Beginning balance (in shares) 671,960,276 597,142,219
Public offering (in shares) 0 16,789,922
Dividend reinvestment plan (in shares) 3,014,264 2,926,494
Exercise of share-based awards (in shares) 673,852 679,834
Conversion of convertible debentures (in shares) 754 1,886
Ending balance (in shares) 675,649,146 617,540,355