Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 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
	March 31,
	2012		2011
	(in millions)
Weighted-average basic common shares outstanding		177.4		176.2
Potential number of shares issuable under the Long-term Stock Incentive Plan		1.1		2.1
Average diluted common shares outstanding		178.5		178.3