Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Weighted Average Shares Outstanding Used to Compute Earnings Per Common Share

The weighted average number of shares outstanding used to compute earnings per common share were as follows (in millions):

	2012		2011		2010
Weighted average common shares outstanding for basic computations		323.7		335.9		364.2
Weighted average dilutive effect of stock options and restricted stock units		4.7		4.0		4.1
Weighted average common shares outstanding for diluted computations		328.4		339.9		368.3