Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2019

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)	2019	2018	2017
Basic	343.6	348.0	353.6
Dilutive effect of stock options and restricted share unit awards	2.0	1.6	2.3
Diluted	345.6	349.6	355.9