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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2022
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
March 31
(Millions of shares)20222021
Basic337.0 338.2 
Dilutive effect of stock options and restricted share unit awards1.2 1.2 
Diluted338.2 339.4