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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2023
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:
(Millions of shares)202320222021
Basic337.8 337.4 337.3 
Dilutive effect of stock options and restricted share unit awards1.0 0.9 1.5 
Diluted338.8 338.3 338.8