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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details) - Permits [Member] - Other Assets [Member] - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount | $ 72.2 | $ 72.2
Definite lived intangible assets - Accumulated Amortization | (23.1) | (22.5)
Definite lived intangible assets - Net Carrying Amount | $ 49.1 | $ 49.7

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