Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

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)	2021	2020
Basic	338.2	341.4
Dilutive effect of stock options and restricted share unit awards	1.2	2.7
Diluted	339.4	344.1