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Shareholders' capital (Tables)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Number of Common Shares

Number of common shares 

						Six months ended June 30
						2021						2020
Common shares, beginning of period						597,142,219						524,223,323
Public offering						16,789,922						8,664,563
Dividend reinvestment plan						2,926,494						1,911,697
Exercise of share-based awards (b)						679,834						1,344,375
Conversion of convertible debentures						1,886						1,509
Common shares, end of period						617,540,355						536,145,467

Fair Value of Share Options Granted

The following assumptions were used in determining the fair value of share options granted: 

						2021
Risk-free interest rate						1.1		%
Expected volatility						23		%
Expected dividend yield						4.1		%
Expected life						5.50 years
Weighted average grant date fair value per option						$	2.46

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Tabular disclosure of the change in common stock outstanding.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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