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Equity Incentive Plan Textuals (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
EQUITY INCENTIVE PLAN [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 312.57	$ 263.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share	$ 8,100,000	7,800,000
Number of Shares Authorized for Stock Option Plan	2,000,000
Options, Award Vesting Period	5 years
Restricted Stock Units, Vesting Period	five
Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 92.81	$ 77.64	$ 66.33
Options, Exercises in Period, Total Intrinsic Value	$ 90.7	$ 66.9	$ 60.0
Stock Options, Vested in Period, Total Fair Value	8.6	6.4	5.7
Restricted Stock Units, Vested in Period, Total Fair Value	6.0	5.8	$ 5.6
Allocated Share-based Compensation Expense for Restricted Stock Units	$ 5.8	$ 5.6
Number of Shares Available for Grant	2,448,666
Deferred Compensation Liability, Current and Noncurrent	$ 44.9
Estimated Weighted Average Amortization Period	2 years 3 months 18 days

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- Definition

Represents the expense recognized during the period arising from the restricted stock units equity-based compensation arrangements with employees and directors.

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EQUITY INCENTIVE PLAN [Abstract]

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Description of the period of time over which an employee's right to exercise a restricted stock unit is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The total fair value of options for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or cash in accordance with the terms of the arrangement.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Per share weighted average intrinsic value of equity-based compensation awards granted. Excludes stock and unit options.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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