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Shareholders' capital (Tables)

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Number of Common Shares

Number of common shares 

		Six months ended June 30
		2020			2019
Common shares, beginning of period		524,223,323			488,851,433
Public offering		8,664,563			509,431
Dividend reinvestment plan		1,911,697			3,225,749
Exercise of share-based awards (b)		1,344,375			886,931
Conversion of convertible debentures		1,509			11,883
Common shares, end of period		536,145,467			493,485,427

Fair Value of Share Options Granted

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

	2020
Risk-free interest rate	1.2		%
Expected volatility	24		%
Expected dividend yield	4.1		%
Expected life	5.50 years
Weighted average grant date fair value per option	C$	2.75

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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=116856206&loc=d3e5070-113901

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