Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 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		Nine Months Ended
	September 30,		September 30,
	2013	2012	2013	2012
	(in millions)
Weighted-average basic common shares outstanding	179.3	177.9	179.2	177.6
Potential number of shares issuable upon exercise of in-the-money stock options under the Long-term Stock Incentive Plan	0.2	—	0.2	1.0
Average diluted common shares outstanding	179.5	177.9	179.4	178.6