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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020 were as follows:
 Three Months Ended
June 30		Six Months Ended
June 30
(number of shares in millions)2021202020212020
Weighted average common shares outstanding237.8 236.6 237.6 236.6 
Effect of dilutive securities:
Stock options1.2 0.3 1.0 0.4 
Other stock compensation plans0.8 0.7 0.8 0.6 
Potentially dilutive common shares2.0 1.0 1.8 1.0 
Adjusted weighted average common shares outstanding239.8 237.6 239.4 237.6 
Dividends per common share$0.54 $0.51 $1.08 $1.02