Earnings Per Share (Tables)

6 Months Ended

Jun. 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		Six Months Ended
	June 30,		June 30,
	2013	2012	2013	2012
	(in millions)
Weighted-average basic common shares outstanding	179.3	177.7	179.1	177.6
Potential number of shares issuable upon exercise of in-the-money stock options under the Long-term Stock Incentive Plan	0.2	—	0.3	0.9
Average diluted common shares outstanding	179.5	177.7	179.4	178.5