Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Computation Of Weighted Average Shares Outstanding

	Three months ended March  31,
(in millions)	2012		2011
Weighted average shares outstanding:
Basic		84.8		88.9
Dilutive share-based awards		0.7		0.6
Diluted		85.5		89.5