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Shareholders' capital - Common Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Common Shares Rollforward
Beginning balance (in shares)	671,960,276	597,142,219
Public offering (in shares)	2,861,709	67,611,465
Dividend reinvestment plan (in shares)	7,676,666	6,184,686
Exercise of share-based awards (in shares)	1,115,398	1,020,020
Conversion of convertible debentures (in shares)	754	1,886
Ending balance (in shares)	683,614,803	671,960,276

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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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