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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 | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Supplemental executive retirement plan assets | $ 27.2 | $ 30.9
Total financial assets | 27.2 | 37.7
Derivative Assets (Liabilities), at Fair Value, Net | (10.7) | 6.8
Total Financial Liabilities | (10.7) |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Supplemental executive retirement plan assets | 27.2 | 30.9
Total financial assets | 27.2 | 30.9
Derivative Assets (Liabilities), at Fair Value, Net | 0.0 | 0.0
Total Financial Liabilities | 0.0 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Supplemental executive retirement plan assets | 0.0 | 0.0
Total financial assets | 0.0 | 6.8
Derivative Assets (Liabilities), at Fair Value, Net | (10.7) | 6.8
Total Financial Liabilities | (10.7) |
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Supplemental executive retirement plan assets | 0.0 | 0.0
Total financial assets | 0.0 | 0.0
Derivative Assets (Liabilities), at Fair Value, Net | 0.0 | $ 0.0
Total Financial Liabilities | $ 0.0 |

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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