Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule Of Weighted Average Number Of Shares Basic And Diluted

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

	Year Ended December 31,
	2012	2011	2010
	(in millions)
Weighted-average basic common shares outstanding	176.5	177.4	175.4
Potential number of shares issuable under the Company's LTSIP	1.0	1.4	2.6
Weighted-average diluted common shares outstanding	177.5	178.8	178.0