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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | $ 22,300,000 | $ 26,000,000.0
Derivative Liability | (1,000,000.0) |
Derivative Assets (Liabilities), at Fair Value, Net | (1,000,000.0) | 5,400,000
Financial Liabilities Fair Value Disclosure | 1,000,000.0 |
Derivative Asset |  | 5,400,000
Total Financial Assets | 22,300,000 | 31,400,000
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets |  | 26,000,000.0
Derivative Liability | 0 |
Financial Liabilities Fair Value Disclosure | 0 |
Derivative Asset |  | 0
Total Financial Assets | 22,300,000 | 26,000,000.0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | 0 | 0
Financial Liabilities Fair Value Disclosure | 1,000,000.0 |
Derivative Asset |  | 5,400,000
Total Financial Assets | 0 | 5,400,000
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | 0 | 0
Derivative Liability | 0 |
Financial Liabilities Fair Value Disclosure | 0 |
Derivative Asset |  | 0
Total Financial Assets | $ 0 | $ 0

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