Incentive Plans (Schedule Of Assumptions To Estimate The Fair Value) (Details) - Performance unit awards	12 Months Ended
Dec. 31, 2020 Rate	Dec. 31, 2019 Rate	Dec. 31, 2018 Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.68%	2.49%	2.41%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of volatilities	30.90%	27.70%	30.40%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of volatilities	44.70%	43.40%	53.30%

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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 (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

+ References

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 (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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.

+ References

No definition available.

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