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Shareholders' capital (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Number of Common Shares

Number of common shares: 

		Six Months Ended June 30
		2019			2018
Common shares, beginning of period		488,851,433			431,765,935
Public offering		509,431			37,505,274
Dividend reinvestment plan		3,225,749			2,532,767
Exercise of share-based awards (c)		886,931			352,800
Conversion of convertible debentures		11,883			38,138
Common shares, end of period		493,485,427			472,194,914

Fair Value of Share Options Granted

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

	2019
Risk-free interest rate	1.9		%
Expected volatility	20		%
Expected dividend yield	4.3		%
Expected life	5.50 years
Weighted average grant date fair value per option	C$	1.66

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Tabular disclosure of the change in common stock outstanding.

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- Definition

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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