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Earnings Per Common Share
6 Months Ended
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)2020201920202019
Weighted average common shares outstanding236.6  236.9  236.6  236.8  
Effect of dilutive securities:
Stock options0.3  0.7  0.4  0.7  
Other stock compensation plans0.7  0.7  0.6  0.6  
Potentially dilutive common shares1.0  1.4  1.0  1.3  
Adjusted weighted average common shares outstanding237.6  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.