Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share

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

Basic and diluted earnings per share were computed using the following common share data (shares in millions):

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2020	2019	2020	2019
Number of common shares outstanding at end of period	422.6	424.2	422.6	424.2
Effect of using weighted average common shares outstanding	0.1	0.3	0.5	0.4
Weighted average basic common shares outstanding	422.7	424.5	423.1	424.6
Dilutive effect of equity-based compensation awards and other contingently issuable shares	1.9	2.9	1.9	2.8
Weighted average diluted common shares outstanding	424.6	427.4	425.0	427.4
Potentially issuable shares	6.3	6.8	6.3	6.8
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	1.3	0.7	1.7	0.7