Stock-Based Compensation (Summary Of PSU-TSR Activity) (Details) - Performance Stock Units, Market Condition [Member]	6 Months Ended
Jun. 30, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units, Unvested at January 1, 2020 \| shares	340,971
Units, Granted \| shares
Units, Achievement adjustment \| shares	7,672
Units, Vested \| shares
Units, Forfeited \| shares	(272,777)
Units, Dividend equivalents \| shares	50
Units, Unvested at June 30, 2020 \| shares	75,916
Weighted-Average Grant-Date Fair Value, Unvested at January 1, 2020 \| $ / shares	$ 47.42
Weighted-Average Grant-Date Fair Value, Granted \| $ / shares
Weighted-Average Grant-Date Fair Value, Achievement adjustment \| $ / shares	47.30
Weighted-Average Grant-Date Fair Value, Vested \| $ / shares
Weighted-Average Grant-Date Fair Value, Forfeited \| $ / shares	47.96
Weighted-Average Grant-Date Fair Value, Dividend equivalents \| $ / shares	47.30
Weighted-Average Grant-Date Fair Value, Unvested at June 30, 2020 \| $ / shares	$ 47.30

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)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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-Publisher FASB
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-Topic 718
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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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-Publisher FASB
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-Topic 718
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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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-Publisher FASB
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- Definition

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

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- Definition

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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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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Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Dividend Equivalents In Period

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