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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2022
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, 2022 and 2021 were as follows:
 Three Months Ended
June 30		Six Months Ended
June 30
(number of shares in millions)2022202120222021
Weighted average common shares outstanding236.4 237.8 236.5 237.6 
Effect of dilutive securities:
Stock options0.5 1.2 0.7 1.0 
Other stock compensation plans0.7 0.8 0.7 0.8 
Potentially dilutive common shares1.2 2.0 1.4 1.8 
Adjusted weighted average common shares outstanding237.6 239.8 237.9 239.4 
Dividends per common share$0.59 $0.54 $1.18 $1.08