Stock-Based Plans (Tables)

12 Months Ended

Dec. 31, 2015

Stock-Based Plans

Summary of restricted stock, restricted stock unit and stock option activity

	Restricted Stock or Restricted Stock Units					Stock Options
	Number			Weighted Average Grant Date Fair Value Per Share		Number			Weighted Average Exercise Price Per Share
Outstanding as of December 31, 2012		1,070,176		$	51.96		3,233,025		$	53.64
Granted		482,959			61.62		884,574			61.45
Expired or canceled		(11,104	)		62.35		(15,607	)		65.46
Vested/exercised		(564,265	)		50.65		(1,137,285	)		46.53
Outstanding as of December 31, 2013		977,766		$	57.36		2,964,707		$	58.63
Granted		370,014			79.06		684,486			79.19
Expired or canceled		(30,032	)		69.17		(58,215	)		73.33
Vested/exercised		(449,227	)		57.08		(417,970	)		57.67
Outstanding as of December 31, 2014		868,521		$	66.35		3,173,008		$	62.92
Granted		556,323			58.85		963,288			59.05
Expired or canceled		(30,484	)		64.74		(118,356	)		63.60
Vested/exercised		(456,052	)		62.92		(46,414	)		38.25
Outstanding as of December 31, 2015		938,308		$	63.62		3,971,526		$	62.25
Options exercisable as of December 31, 2015							2,331,002		$	60.53
Remaining unvested options outstanding and expected to vest							1,591,308		$	64.70

Schedule of fair value on grant date and significant assumptions used in Black-Scholes option-pricing model

	December 31,
	2015			2014
Weighted average grant date fair value	$	16.72		$	23.04
Expected life of options (in years)		5.9			5.8
Risk-free interest rate		1.7	%		1.8	%
Expected volatility		32.1	%		31.6	%
Expected annual dividend per share	$	0.84		$	0.84

Summary of information related to options outstanding

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (In Years)		Weighted Average Exercise Price Per Share		Number Exercisable		Weighted Average Remaining Contractual Life (In Years)		Weighted Average Exercise Price Per Share
$30.46 - $41.77		152,128		3.2	$	30.46		152,128		3.2	$	30.46
$42.11 - $62.50		2,595,955		7.1		58.20		1,381,995		5.7		56.95
$68.36 - $80.12		1,223,443		6.3		74.81		796,879		5.3		72.47
		3,971,526		6.7	$	62.25		2,331,002		5.4	$	60.53