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Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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