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Stock-Based Plans (Tables)

12 Months Ended

Dec. 31, 2017

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, 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
Granted		553,415		46.50			662,001		46.07
Expired or canceled		(16,298	)	54.26			(63,229	)	50.25
Vested/exercised		(443,062	)	64.55			(88,917	)	41.13
Outstanding as of December 31, 2016		1,032,363		$	54.19		4,481,381		$	60.45
Granted		402,783		54.88			1,103,817		55.35
Expired or canceled		(48,005	)	51.58			(285,434	)	63.07
Vested/exercised		(453,677	)	59.89			(229,808	)	40.82
Outstanding as of December 31, 2017		933,464		$	51.85		5,069,956		$	60.08
Options exercisable as of December 31, 2017							3,323,462		$	63.41
Remaining unvested options outstanding and expected to vest							1,694,099		$	53.75

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

		December 31,
		2017			2016
Weighted average grant date fair value		$	14.23		$	12.55
Expected life of options (in years)		5.8			6.1
Risk-free interest rate		2.3		%	1.6		%
Expected volatility		27.8		%	32.4		%
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 - $35.00		76,750		1.2		$	30.46		76,750		1.2		$	30.46
$42.75 - $62.50		3,940,424		6.9		56.53			2,193,930		5.6		58.74
$68.36 - $80.12		1,052,782		4.6		75.54			1,052,782		4.6		75.54
		5,069,956		6.3		$	60.08		3,323,462		5.2		$	63.41

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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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