Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share

Earnings Per Share

6.    Earnings Per Share

Basic and diluted earnings per share were computed using the following common share data for the three months ended March 31 (shares in millions):

	2018	2017
Number of common shares outstanding at end of period	431.8	441.9
Effect of using weighted average common shares outstanding	1.5	(0.6)
Weighted average basic common shares outstanding	433.3	441.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares	2.5	2.8
Weighted average diluted common shares outstanding	435.8	444.1
Potentially issuable shares	8.2	9.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	3.0	3.0