Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

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)	2018	2017
Basic	350.4	356.0
Dilutive effect of stock options and restricted share unit awards	2.2	2.6
Diluted	352.6	358.6