Weighted Average Shares Outstanding (Tables)

3 Months Ended

Mar. 31, 2012

Weighted Average Shares Outstanding [Abstract]

Reconciliation Of Basic To Diluted Shares Outstanding

	Three Months Ended March 31,
	2012		2011
Basic		223.4		228.9
Dilutive effect of shares issuable under stock-based compensation plans		4.0		2.5
Diluted		227.4		231.4
Anti-dilutive options to purchase common shares and restricted stock excluded from the table above		7.0		13.7