Weighted Average Shares Outstanding (Tables)

9 Months Ended

Sep. 30, 2011

Weighted Average Shares Outstanding [Abstract]

Reconciliation Of Basic To Diluted Shares Outstanding

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Basic		226.0		234.3		227.7		235.5
Dilutive effect of shares issuable under stock-based compensation plans		3.0		1.4		3.0		1.6
Diluted		229.0		235.7		230.7		237.1
Anti-dilutive options to purchase common shares and restricted stock excluded from the table above		10.7		16.0		10.8		16.3