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Shareholders' capital - Common Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Common Shares Rollforward
Beginning balance (in shares)	488,851,433	431,765,935
Public offering and subscription receipts (in shares)	28,009,341	50,041,624
Dividend reinvestment plan (in shares)	6,068,465	5,880,843
Exercise of share-based awards	1,274,655	1,106,105
Conversion of convertible debentures (in shares)	19,429	56,926
Ending balance (in shares)	524,223,323	488,851,433

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- Definition

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

+ References

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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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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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