Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Weighted-average assumptions for calculating fair values of stock options granted

During the six months ended June 30, 2011 and 2010, the weighted-average estimated fair values of stock options granted were $5.35 and $5.25 per option, respectively, which were calculated using the following weighted-average assumptions:


	Six Months Ended June 30,
	2011			2010
Expected volatility		27.3	%		28.6	%
Risk-free interest rate		1.7	%		2.4	%
Dividend yield		2.7	%		2.9	%
Expected life (in years)		4.4			4.3
Contractual life (in years)		7			7
Expected forfeiture rate		3.0	%		3.0	%

Stock option activity

The following table summarizes the stock option activity for the six months ended June 30, 2011:


						Weighted Average		Aggregate
	Number			Weighted Average		Remaining		Intrinsic
	of Shares			Exercise		Contractual Term		Value
	(in millions)			Price per Share		(years)		(in millions)
Outstanding at December 31, 2010		13.6		$	24.97
Granted		2.9		$	29.87
Exercised		(1.3	)	$	22.73			$	11.6

Forfeited or expired		(0.2	)	$	30.35

Outstanding at June 30, 2011		15.0		$	26.04		4.6	$	72.4

Exercisable at June 30, 2011		8.3		$	24.90		3.8	$	49.8

Restricted stock unit and restricted stock activity

The following table summarizes the restricted stock unit and restricted stock activity for the six months ended June 30, 2011:


	Number of
	Restricted Stock			Weighted Average		Weighted Average
	Units and Shares of			Grant Date		Remaining		Aggregate
	Restricted Stock			Fair Value per		Contractual		Intrinsic
	(in thousands)			Share		Term (years)		Value
Unissued at December 31, 2010		849.3		$	26.39
Granted		169.4		$	30.02
Vested and Issued		(134.8	)	$	25.74
Forfeited		(8.1	)	$	24.97

Unissued at June 30, 2011		875.8		$	27.21		0.6	$	27.0

Vested and unissued at June 30, 2011		477.8		$	27.21