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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Average Common Shares Outstanding Basic and Diluted The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:
Three Months Ended
June 30		Six Months Ended
June 30
(Millions of shares)2020201920202019
Basic340.9  344.2  341.1  344.3  
Dilutive effect of stock options and restricted share unit awards1.0  1.8  1.2  1.7  
Diluted341.9  346.0  342.3  346.0