Earnings Per Share (Tables)

3 Months Ended

Mar. 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:

	3 Months Ended		12 Months Ended
	March 31,		March 31,
	2012	2011	2012	2011
	(in millions)
Weighted-average basic common shares outstanding	178.2	177.0	177.8	176.2
Potential number of shares issuable under the Company's LTSIP	1.1	1.5	1.3	2.3
Weighted-average diluted common shares outstanding	179.3	178.5	179.1	178.5