XML 57 R38.htm IDEA: XBRL DOCUMENT
v3.20.2

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 |

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCommonStockOutstandingRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration