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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | $ 21.2 | $ 26.0
Derivative Liability | (12.6) |
Derivative Assets (Liabilities), at Fair Value, Net | (12.6) | 5.4
Financial Liabilities Fair Value Disclosure | 12.6 |
Derivative Asset |  | 5.4
Total Financial Assets | 21.2 | 31.4
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 |  | 26.0
Derivative Liability | 0.0 |
Financial Liabilities Fair Value Disclosure | 0.0 |
Total Financial Assets | 21.2 | 26.0
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 | 0.0
Financial Liabilities Fair Value Disclosure | 12.6 |
Derivative Asset |  | 5.4
Total Financial Assets | 0.0 | 5.4
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 | 0.0
Derivative Liability | 0.0 |
Financial Liabilities Fair Value Disclosure | 0.0 |
Total Financial Assets | $ 0.0 | $ 0.0

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