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Equity Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2017

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

Table of Performance Share Unit Monte Carlo Assumptions [Table Text Block]

	2017			2016
Risk-free interest rate	1.73	%		0.98	%
Expected life in years	3.0			3.0
Expected volatility	28	%		29	%
Expected dividend yield	—			—

Schedule of Stock Options, Activity

	Number of Options			Weighted Average Exercise Price		Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016	1,215,481			$192.63		$274.6
Granted	46,877			671.60
Exercised	(245,562	)		116.67
Forfeited	(8,320	)		241.83
Outstanding at December 31, 2017	1,008,476			$232.99		$392.2
Options exercisable at December 31, 2017	755,407			$180.66		$331.5

Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range

Number of Options Outstanding			Weighted Average Exercise Price				Remaining Contractual Life of Options Outstanding		Options Exercisable
		102,357									$	89.23			1.7		102,357
124,585			$	133.00			2.8		124,585
298,180			$	159.96			4.4		298,180
125,523			$	244.99			5.9		100,716
357,831			$	365.57			8.0		129,569
1,008,476							5.4		755,407

Schedule of Stock Options, Valuation Assumptions

	2017			2016			2015
Risk-free interest rate	2.00	%		1.26	%		1.65	%
Expected life in years	5.8			5.7			5.7
Expected volatility	28	%		29	%		28	%
Expected dividend yield	—			—			—

Schedule Restricted Stock Units, Activity

	Number of Restricted Stock Units			Aggregate Intrinsic Value (in millions)				Number of Performance Share Units			Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016	70,547			$	29.5			4,532			$	1.9
Granted	13,202							3,518
Vested	(24,851	)						—
Forfeited	(2,509	)						—
Outstanding at December 31, 2017	56,389			$	34.9			8,050			$	5.0

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- Definition

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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Tabular disclosure of the changes in outstanding nonvested shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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