Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2012

Stock-Based Compensation Plans

Information with respect to stock options granted

	2009 Plan shares			Weighted average exercise price per share		1994 Plan shares			Weighted average exercise price per share
Options Outstanding, December 31, 2009		—		$	—		2,836,254		$	80.76
Exercised		—			—		(729,381	)		57.87
Granted		126,484			74.20		—			—
Forfeited		—			—		(34,656	)		100.02
Options Outstanding, December 31, 2010		126,484		$	74.20		2,072,217		$	88.50
Exercised		(23,908	)		75.75		(930,391	)		82.43
Granted		144,827			115.83		—			—
Forfeited		—			—		(28,867	)		68.29
Options Outstanding, December 31, 2011		247,403		$	98.42		1,112,959		$	94.10
Exercised		(43,265	)		85.09		(364,519	)		68.21
Granted		115,303			133.16		—			—
Forfeited		(11,887	)		115.15		(28,610	)		139.58
Options Outstanding, December 31, 2012		307,554		$	112.67		719,830		$	105.40
Options Exercisable:
December 31, 2010		3,417		$	74.20		1,730,978		$	93.60
December 31, 2011		30,771		$	81.54		1,012,304		$	98.62
December 31, 2012		74,618		$	97.46		719,830		$	105.40

Summary of exercise prices and contractual lives of options outstanding

The following summarizes the exercise prices and contractual lives of options outstanding as of December 31, 2012:

2009 Plan Number of Options	Range—Exercise Price	Weighted Average Remaining Contractual Term (in years)
69,287	$70.00 - 79.99		7.1
127,930	110.00 - 119.99		8.1
108,838	130.00 - 139.99		9.1
1,499	140.00 - 149.99		9.5
307,554

1994 Plan Number of Options	Range—Exercise Price	Weighted Average Remaining Contractual Term (in years)
1,424	$30.00 - 39.99		0.1
94,898	40.00 - 49.99		3.5
41,556	60.00 - 69.99		2.1
730	70.00 - 79.99		2.5
107,833	80.00 - 89.99		5.1
187,380	90.00 - 99.99		3.1
286,009	140.00 - 149.99		4.1
719,830

Summary of weighted average fair value of employee stock options and associated assumptions used to calculate the value

	2012			2011			2010
Weighted average fair value per share	$	29.11		$	29.40		$	19.45
Life of options (in years)		5.0			7.0			7.0
Dividend yield		3.5	%		4.0	%		5.5	%
Volatility		35.00	%		35.00	%		43.00	%
Risk-free interest rate		0.87	%		3.04	%		3.15	%