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, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount $ 189.7 $ 196.5
Definite lived intangible assets - Accumulated Amortization (74.7) (67.5)
Definite lived intangible assets - Net Carrying Amount 115.0 129.0
Permits [Member] | Intangible Assets, Net [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 129.3 136.1
Definite lived intangible assets - Accumulated Amortization (33.3) (31.7)
Definite lived intangible assets - Net Carrying Amount 96.0 104.4
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 (38.0) (32.4)
Definite lived intangible assets - Net Carrying Amount 16.7 22.3
Leases [Member] | Intangible Assets, Net [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 5.7 5.7
Definite lived intangible assets - Accumulated Amortization (3.4) (3.4)
Definite lived intangible assets - Net Carrying Amount 2.3 2.3
Below Market Sales Contracts [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount (296.7) (296.7)
Definite lived intangible assets - Accumulated Amortization 198.2 181.6
Definite lived intangible assets - Net Carrying Amount (98.5) (115.1)
Below Market Sales Contracts [Member] | Other Current Liabilities [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount (46.0) (46.0)
Definite lived intangible assets - Accumulated Amortization 7.6   
Definite lived intangible assets - Net Carrying Amount (38.4) (46.0)
Below Market Sales Contracts [Member] | Other Liabilities [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount (250.7) (250.7)
Definite lived intangible assets - Accumulated Amortization 190.6 181.6
Definite lived intangible assets - Net Carrying Amount $ (60.1) $ (69.1)