Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Components of basic and diluted shares used in EPS

A reconciliation of the components of basic and diluted shares used in the EPS calculation follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2012		2011		2012		2011
	(in millions)
Weighted-average basic common shares outstanding		177.7		176.6		177.6		176.4
Potential number of shares issuable upon excerise of in-the-money stock options under the Long-term Stock Incentive Plan		-		2.0		0.9		2.1
Average diluted common shares outstanding		177.7		178.6		178.5		178.5