Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity

Treasury stock activity

	2012				2011				2010
(amounts in thousands)	$		# shares		$		# shares		$		# shares
Shares repurchased in connection with:
Board approved buyback programs	$	314,787		6,654.0	$	—		—	$	250,000		4,753.6
Employee benefit plans		8,986		207.5		8,810		158.4		6,351		115.2
Total	$	323,773		6,861.5	$	8,810		158.4	$	256,351		4,868.8

Schedule of stock option valuation assumptions

	2012		2011		2010
Expected stock price volatility		38%		37%		35%
Range of risk free interest rates		0.03% - 2.01%		0.10% - 3.62%		0.06% - 3.78%
Expected life of options (years)		5.2		4.8		4.7

Schedule of stock option activity

	Number of Shares (in thousands)			Weighted Average Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value (in millions)
Options outstanding, December 31, 2011		3,883.2		$	51.11
Granted		1,061.3		$	48.13
Exercised		(396.3	)	$	32.01
Forfeited		(209.3	)	$	58.41
Options outstanding, December 31, 2012		4,338.9		$	51.77	6.6 years	$	32.7
Vested & unvested expected to vest, December 31, 2012		4,220.3		$	51.87	6.5 years	$	31.5
Exercisable at December 31, 2012		2,520.0		$	51.55	5.2 years	$	22.0

Schedule of aggregate intrinsic value of options exercised and the aggregate grant-date fair value of shares vested

	2012		2011		2010
(in millions)
Aggregate intrinsic value of options exercised	$	7.6	$	5.0	$	9.7
Aggregate grant-date fair value of shares vested	$	14.3	$	9.9	$	8.3

Schedule of performance-based shares and restricted stock activity

	Performance-based Shares					Restricted Stock
	Number of Shares (in thousands)			Weighted Average Grant Date Fair Value		Number of Shares (in thousands)			Weighted Average Grant Date Fair Value
Non-vested at December 31, 2011		229.1		$	58.58		820.3		$	54.23
Granted		139.1		$	50.06		562.7		$	48.11
Vested		(82.9	)	$	58.34		(404.2	)	$	51.77
Forfeited		(21.3	)	$	55.05		(88.9	)	$	52.87
Non-vested at December 31, 2012		264.0		$	54.45		889.9		$	51.61