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Equity Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2016

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

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

	2016
Risk-free interest rate	0.98	%
Expected life in years	3.0
Expected volatility	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, 2015	1,374,705			$162.29		$243.1
Granted	92,992			397.95
Exercised	(250,520	)		101.67
Forfeited	(1,696	)		294.14
Outstanding at December 31, 2016	1,215,481			$192.63		$274.6
Options exercisable at December 31, 2016	888,061			$152.23		$236.5

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
		209,721									$	87.36			2.6		209,721
220,815			$	127.63			3.1		220,815
332,507			$	159.62			5.3		300,382
131,135			$	244.99			6.8		81,249
321,303			$	318.83			8.8		75,894
1,215,481							5.5		888,061

Schedule of Stock Options, Valuation Assumptions

	2016			2015			2014
Risk-free interest rate	1.26	%		1.65	%		1.66	%
Expected life in years	5.7			5.7			5.6
Expected volatility	29	%		28	%		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, 2015	82,074			$	27.8			—			$	—
Granted	20,916							4,532
Vested	(28,103	)						—
Forfeited	(4,340	)						—
Outstanding at December 31, 2016	70,547			$	29.5			4,532			$	1.9

X

- 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
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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
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-Name Accounting Standards Codification
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