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Shareholders' capital (Tables) | 6 Months Ended
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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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- 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=120381028&loc=d3e5070-113901 + Details
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