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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Restricted Stock Unit Activity

Restricted stock unit activity is presented in the following tables.

	Shares (thousands)			Weighted Average Grant Date Fair Value			Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2017	727.7			$	118.96		1.24
Granted	119.3			160.86
Vested	(173.8	)		121.15
Forfeited	(15.2	)		124.62
Unvested as of March 31, 2018	658.0			$	126.31		2.20
Unvested as of December 31, 2016	750.9			$	113.97		1.71
Granted	140.9			116.42
Vested	(103.2	)		89.44
Forfeited	(2.9	)		115.93
Unvested as of March 31, 2017	785.7			$	117.62		1.82

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- References

No definition available.

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- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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