Employee Stock and Incentive Plan (Summary Of Nonvested PSU Transactions) (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Share Units	206,163	239,512	146,867
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock units at beginning of period, Number of Share Units	283,007
Granted, Number of Share Units	151,711		0
Performance criteria adjustment, Number of Share Units	70,783
Forfeited, Number of Share Units	(8,789)
Share units issued, Number of Share Units	141,328
Nonvested stock units at end of period, Number of Share Units	355,384	283,007
Nonvested stock units at beginning of period, Weighted Average Fair Value	$ 34.57
Granted, Weighted Average Fair Value	43.18
Performance criteria adjustment, Weighted Average Fair Value	49.41
Forfeited, Weighted Average Fair Value	46.34
Share units issued, Weighted Average Fair Value	31.36
Nonvested stock units at end of period, Weighted Average Fair Value	$ 42.19	$ 34.57

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

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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.

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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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Number of shares issued under share-based payment arrangement.

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Share based compensation arrangement by share based payment award equity instruments other than options performance criteria adjustment

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