Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2010

Stock-based Compensation [Abstract]

Restricted Stock Unit Activity

Restricted stock unit activity for the three months ended September 30, 2011 is as follows:

	Shares (thousands)			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value ($ in millions)
Unvested at July 1, 2011		2,076.3		$	58.04
Granted		-			-
Vested		(730.3	)		42.94
Forfeited		(4.3	)		51.16
Unvested at September 30, 2011		1,341.7		$	66.28	2.07 years	$	128.7
Unvested shares expected to vest		1,303.0		$	66.15	2.07 years	$	125.0

Restricted stock unit activity for the nine months ended September 30, 2011 is as follows:

	Shares (thousands)			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value ($ in millions)
Unvested at January 1, 2011		2,085.6		$	50.47
Granted		397.8			89.46
Vested		(1,100.8	)		45.04
Forfeited		(40.9	)		57.40
Unvested at September 30, 2011		1,341.7		$	66.28	2.07 years	$	128.7
Unvested shares expected to vest		1,303.0		$	66.15	2.07 years	$	125.0