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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Schedule of Employee Stock Purchase Plan

Following is information regarding our 2009 ESPP:

Year Ended December 31,		2017
Shares purchased pursuant to 2009 ESPP		90,881
Weighted average per share price of shares purchased		$	86.13
Weighted average per share discount from market value for shares purchased		$	15.20
As of December 31,		2017
Shares available for purchase pursuant to 2009 ESPP		281,870

Schedule of Restricted Stock Units Activity

RSU grants vest over a period of time up to four years from the date of grant. RSU activity was as follows:

	RSUs			Weighted average grant date fair value
Balance, December 31, 2016	298,984			$	80.37
Granted	162,356			99.24
Vested	(90,215	)		69.61
Forfeited	(26,321	)		83.86
Balance, December 31, 2017	344,804			91.81

Schedule of Stock-Based Compensation

Certain information regarding our stock-based compensation was as follows:

Year Ended December 31,		2017				2016				2015
Per share intrinsic value of non-vested stock granted		$	99.24			$	82.90			$	88.74
Weighted average per share discount for compensation expense recognized under the 2009 ESPP		15.20				13.00				15.89
Total intrinsic value of stock options exercised (in millions)		—				—				0.5
Fair value of non-vested stock that vested during the period (in millions)		69.6				47.5				19.3
Stock-based compensation recognized in Consolidated Statements of Operations, as a component of selling, general and administrative expense (in millions)		11.3				11.0				11.9
Tax benefit recognized in Consolidated Statements of Operations (in millions)		3.5				3.8				4.2
Cash received from options exercised and shares purchased under all share-based arrangements (in millions)		7.8				7.0				6.5
Tax deduction realized related to stock options exercised (in millions)		9.0				8.9				7.6

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Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

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Tabular disclosure of employee stock purchase plan activity.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

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