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Shareholders' capital - Common Shares (Detail) - shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Common Shares Rollforward
Beginning balance (in shares)	597,142,219	524,223,323
Public offering and subscription receipts (in shares)	16,789,922	8,664,563
Dividend reinvestment plan (in shares)	2,926,494	1,911,697
Exercise of share-based awards (in shares)	679,834	1,344,375
Conversion of convertible debentures (in shares)	1,886	1,509
Ending balance (in shares)	617,540,355	536,145,467

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- Definition

Stock Issued During Period, Shares, Dividend reinvestment and Employee Stock Purchase Plan

+ References

No definition available.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of new stock issued during the period.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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