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Shareholders' equity | 9 Months Ended
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Sep. 30, 2020
Statement [LineItems] |
Shareholders' equity | 11. Shareholders’ equity i) Issued
Shareholders’ capital |  | Common Shares |  |  | Amount |
Balance, December 31, 2018 |  |  | 72,473,719 |  |  | $ | 2,185 |
Issued on exercise of equity compensation plans (1) |  |  | 537,769 |  |  |  | 2 |
Balance, December 31, 2019 |  |  | 73,011,488 |  |  | $ | 2,187 |
Issued on exercise of equity compensation plans (1) |  |  | 495,255 |  |  |  | — |
Balance, September 30, 2020 |  |  | 73,506,743 |  |  | $ | 2,187 |
(1) | Upon vesting or exercise of equity awards, the net benefit is recorded as a reduction of other reserves and an increase to shareholders’ capital.
ii) Earnings per share - Basic and Diluted The weighted average number of shares used to calculate per share amounts was as follows:
|  | Three months ended September 30 |  |  | Nine months ended September 30 |
Average shares outstanding (millions) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Basic and Diluted |  |  | 73.5 |  |  |  | 73.0 |  |  |  | 73.2 |  |  |  | 72.8 |
For the third quarter of 2020 and for the first nine months of 2020, 1.0 million common shares (2019 – 0.2 million) that are issuable under the Stock Option Plan (“Option Plan”) were excluded in calculating the weighted average number of diluted shares outstanding as they were considered anti-dilutive.

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