Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount $ 187.3 $ 184.5
Definite lived intangible assets - Accumulated Amortization (95.7) (89.1)
Definite lived intangible assets - Net Carrying Amount 91.6 95.4
Permits [Member] | Intangible Assets, Net [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 130.2 127.4
Definite lived intangible assets - Accumulated Amortization (41.6) (35.9)
Definite lived intangible assets - Net Carrying Amount 88.6 91.5
Utility Contracts [Member] | Intangible Assets, Net [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 54.7 54.7
Definite lived intangible assets - Accumulated Amortization (53.9) (53.1)
Definite lived intangible assets - Net Carrying Amount 0.8 1.6
Leases [Member] | Intangible Assets, Net [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 2.4 2.4
Definite lived intangible assets - Accumulated Amortization (0.2) (0.1)
Definite lived intangible assets - Net Carrying Amount 2.2 2.3
Below Market Sales Contracts [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount (228.9) (228.9)
Definite lived intangible assets - Accumulated Amortization 167.4 159.7
Definite lived intangible assets - Net Carrying Amount (61.5) (69.2)
Below Market Sales Contracts [Member] | Other Current Liabilities [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount (23.0) (23.0)
Definite lived intangible assets - Accumulated Amortization      
Definite lived intangible assets - Net Carrying Amount (23.0) (23.0)
Below Market Sales Contracts [Member] | Other Liabilities [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount (205.9) (205.9)
Definite lived intangible assets - Accumulated Amortization 167.4 159.7
Definite lived intangible assets - Net Carrying Amount $ (38.5) $ (46.2)