Stock-Based Compensation (Summary Of PSU Activity) (Details) - Performance Stock Units (PSUs) [Member] - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units, Unvested at January 1, 2020	721,398
Units, Granted	249,564	155,872
Units, Achievement adjustment	(40,509)
Units, Forfeited	(106,962)
Units, Dividend equivalents	3,673
Units, Unvested at June 30, 2020	827,164	721,398
Weighted-Average Grant-Date Fair Value, Unvested at January 1, 2020	$ 67.97
Weighted-Average Grant-Date Fair Value, Granted	43.45
Weighted-Average Grant-Date Fair Value, Achievement adjustment	44.50
Weighted-Average Grant-Date Fair Value, Forfeited	61.22
Weighted-Average Grant-Date Fair Value, Dividend equivalents	65.25
Weighted-Average Grant-Date Fair Value, Unvested at June 30, 2020	$ 58.94	$ 67.97

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

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

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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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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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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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