Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

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:

	3 Months Ended		12 Months Ended
	March 31,		March 31,
	2013	2012	2013	2012
	(in millions)
Weighted-average basic common shares outstanding	175.3	178.2	175.6	177.8
Potential number of shares issuable under the Company's LTSIP	0.8	1.1	0.9	1.3
Weighted-average diluted common shares outstanding	176.1	179.3	176.5	179.1