Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

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,
	2013	2012
	(in millions)
Weighted-average basic common shares outstanding	177.0	177.4
Potential number of shares issuable upon exercise of in-the-money stock options under the Long-term Stock Incentive Plan	—	1.1
Average diluted common shares outstanding	177.0	178.5