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Earnings Per Common Share | 6 Months Ended
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Jun. 30, 2020
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 six months ended June 30, 2020 and 2019 were as follows:
| Three Months Ended June 30 |  |  |  | Six Months Ended June 30 |  |
(number of shares in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Weighted average common shares outstanding | 236.6 |  |  | 236.9 |  |  | 236.6 |  |  | 236.8 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options | 0.3 |  |  | 0.7 |  |  | 0.4 |  |  | 0.7 |
Other stock compensation plans | 0.7 |  |  | 0.7 |  |  | 0.6 |  |  | 0.6 |
Potentially dilutive common shares | 1.0 |  |  | 1.4 |  |  | 1.0 |  |  | 1.3 |
Adjusted weighted average common shares outstanding | 237.6 |  |  | 238.3 |  |  | 237.6 |  |  | 238.1 |
Dividends per common share | $0.51 |  |  | $0.48 |  |  | $1.02 |  |  | $0.96 |
Excluded from the computation of earnings per diluted share due to their antidilutive effect were 2.7 million and 2.1 million outstanding stock options for the three and six months ended June 30, 2020, respectively and 1.0 million outstanding stock options for both the three and six months ended June 30, 2019.

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