Stock-Based Compensation Plans (Schedule Of Changes Of Restricted Stock) (Details) shares in Thousands	12 Months Ended
Dec. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
weighted average of shares for total future compensation cost related to unvested share-based awards	1 year 10 months 2 days
Restricted Stock And Restricted Stock Units [Member]
Restricted Share Units (in 000’s)
Beginning Balance (in shares) \| shares	503
Ending Balance (in shares) \| shares	480
Weighted Average Grant-Date Fair Value
Beginning Balance (in dollars per share) \| $ / shares	$ 77.58
Ending Balance (in dollars per share) \| $ / shares	$ 83.23
Restricted Stock Units (RSUs) [Member]
Restricted Share Units (in 000’s)
Granted (in shares) \| shares	178
Vested (in shares) \| shares	(162)
Forfeited (in shares) \| shares	(45)
Weighted Average Grant-Date Fair Value
Granted (in dollars per share) \| $ / shares	$ 80.27
Vested (in dollars per share) \| $ / shares	67.11
Forfeited (in dollars per share) \| $ / shares	$ 77.62
Performance Based Restricted Share Units [Member]
Restricted Share Units (in 000’s)
Granted (in shares) \| shares	82
Vested (in shares) \| shares	(61)
Forfeited (in shares) \| shares	(15)
Weighted Average Grant-Date Fair Value
Granted (in dollars per share) \| $ / shares	$ 79.14
Vested (in dollars per share) \| $ / shares	80.00
Forfeited (in dollars per share) \| $ / shares	$ 88.79

weighted average of shares for total future compensation cost related to unvested share-based awards

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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The number of grants made 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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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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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