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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount $ 78.7 $ 78.4
Definite lived intangible assets - Accumulated Amortization (25.1) (24.6)
Definite lived intangible assets - Net Carrying Amount 53.6 53.8
Permits [Member] | Other Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 78.7 78.4
Definite lived intangible assets - Accumulated Amortization (25.1) (24.6)
Definite lived intangible assets - Net Carrying Amount $ 53.6 $ 53.8