Earnings Per Share

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Earnings Per Share

6. Earnings Per Share

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

	Three Months Ended June  30,					Six Months Ended June  30,
	2014		2013			2014			2013
Number of common shares outstanding at end of period		465.9		468.1			465.9			468.1
Effect of using weighted average common shares outstanding		—		(0.2	)		(0.3	)		(1.3	)
Weighted average basic common shares outstanding		465.9		467.9			465.6			466.8
Dilutive effect of equity-based compensation awards and other contingently issuable shares		2.1		1.5			1.9			1.3
Weighted average diluted common shares outstanding		468.0		469.4			467.5			468.1
Potentially issuable shares		13.8		13.6			13.8			13.6
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding		0.8		1.2			2.8			3.2