Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share

Common Share Data Used for Computing Basic and Diluted Earnings Per Share

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

	2020	2019
Number of common shares outstanding at end of period	422.0	424.7
Effect of using weighted average common shares outstanding	2.2	(0.2)
Weighted average basic common shares outstanding	424.2	424.5
Dilutive effect of equity-based compensation awards and other contingently issuable shares	2.2	2.4
Weighted average diluted common shares outstanding	426.4	426.9
Potentially issuable shares	6.6	7.6
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	2.1	3.0