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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2022 and 2021 were as follows:
 Three Months Ended
September 30		Nine Months Ended
September 30
(number of shares in millions)2022202120222021
Weighted average common shares outstanding235.5 237.9 236.2 237.7 
Effect of dilutive securities:
Stock options0.4 1.1 0.6 1.0 
Other stock compensation plans0.7 0.8 0.7 0.8 
Potentially dilutive common shares1.1 1.9 1.3 1.8 
Adjusted weighted average common shares outstanding236.6 239.8 237.5 239.5 
Dividends per common share$0.62 $0.59 $1.80 $1.67