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Shareholders' capital - Common Shares (Detail) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Common Shares Rollforward    
Beginning balance (in shares) 597,142,219 524,223,323
Public offering (in shares) 67,611,465 66,130,063
Dividend reinvestment plan (in shares) 6,184,686 5,217,071
Exercise of share-based awards (in shares) 1,020,020 1,565,537
Conversion of convertible debentures (in shares) 1,886 6,225
Ending balance (in shares) 671,960,276 597,142,219