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EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE | EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE BASIC Earnings per common share is calculated by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding. The weighted average number of common shares outstanding has been reduced by our pro-rata weighted average interest in our own common shares of approximately 3 million and 6 million for the three months ended March 31, 2021 and 2020, respectively, resulting from our reciprocal investment in Noverco Inc. DILUTED The treasury stock method is used to determine the dilutive impact of stock options. This method assumes any proceeds from the exercise of stock options would be used to purchase common shares at the average market price during the period. Weighted average shares outstanding used to calculate basic and diluted earnings per share are as follows:
| Three months ended March 31, |  |
| 2021 | 2020 |  |  |
(number of shares in millions) |  |  |  |  |
Weighted average shares outstanding | 2,022 |  | 2,019 |  |  |  |
Effect of dilutive options | 1 |  | 2 |  |  |  |
Diluted weighted average shares outstanding | 2,023 |  | 2,021 |  |  |  |
For the three months ended March 31, 2021 and 2020, 27.6 million and 16.7 million, respectively, of anti-dilutive stock options with a weighted average exercise price of $51.42 and $56.26, respectively, were excluded from the diluted earnings per common share calculation. DIVIDENDS PER SHARE On May 4, 2021, our Board of Directors declared the following quarterly dividends. All dividends are payable on June 1, 2021 to shareholders of record on May 14, 2021.
| Dividend per share
Common Shares 1 | $0.83500 |
Preference Shares, Series A | $0.34375 |
Preference Shares, Series B | $0.21340 |
Preference Shares, Series C 2 | $0.15501 |
Preference Shares, Series D | $0.27875 |
Preference Shares, Series F | $0.29306 |
Preference Shares, Series H | $0.27350 |
Preference Shares, Series J | US$0.30540 |
Preference Shares, Series L | US$0.30993 |
Preference Shares, Series N | $0.31788 |
Preference Shares, Series P | $0.27369 |
Preference Shares, Series R | $0.25456 |
Preference Shares, Series 1 | US$0.37182 |
Preference Shares, Series 3 | $0.23356 |
Preference Shares, Series 5 | US$0.33596 |
Preference Shares, Series 7 | $0.27806 |
Preference Shares, Series 9 | $0.25606 |
Preference Shares, Series 11 | $0.24613 |
Preference Shares, Series 13 | $0.19019 |
Preference Shares, Series 15 | $0.18644 |
Preference Shares, Series 17 | $0.32188 |
Preference Shares, Series 19 | $0.30625 |
1 The quarterly dividend per common share was increased 3% to $0.835 from $0.81, effective March 1, 2021. 2 The quarterly dividend per share paid on Series C was increased to $0.15501 from $0.15349 on March 1, 2021, due to reset on a quarterly basis following the date of issuance of the Series C Preference Shares.

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