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Earnings Per Common Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share The effect of dilutive securities on the weighted average common shares outstanding included in the calculation of earnings per diluted common share for the three and nine months ended September 30, 2021 and 2020 were as follows:
| Three Months Ended September 30 |  | Nine Months Ended September 30
(number of shares in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Weighted average common shares outstanding | 237.9 |  |  | 236.8 |  |  | 237.7 |  |  | 236.6 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options | 1.1 |  |  | 0.5 |  |  | 1.0 |  |  | 0.4 |
Other stock compensation plans | 0.8 |  |  | 0.6 |  |  | 0.8 |  |  | 0.7 |
Potentially dilutive common shares | 1.9 |  |  | 1.1 |  |  | 1.8 |  |  | 1.1 |
Adjusted weighted average common shares outstanding | 239.8 |  |  | 237.9 |  |  | 239.5 |  |  | 237.7 |
Dividends per common share | $0.59 |  |  | $0.54 |  |  | $1.67 |  |  | $1.56 |
Excluded from the computation of earnings per diluted share due to their antidilutive effect were 1.5 million and 2.0 million of outstanding stock options for the three and nine months ended September 30, 2020, respectively. No shares have been excluded due to an antidilutive effect for the three and nine months ended September 30, 2021.

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