Annual report pursuant to Section 13 and 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
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount $ 196.5 $ 194.5
Definite lived intangible assets - Accumulated Amortization (67.5) (47.5)
Definite lived intangible assets - Net Carrying Amount 129.0 147.0
Below-market sales contracts - Gross Carrying Amount (296.7) (329.3)
Below-market sales contracts - Accumulated Amortization 181.6 164.8
Below-market sales contracts - Net Carrying Amount (115.1) (164.5)
Below-Market Sales Contracts Current [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Below-market sales contracts - Gross Carrying Amount (46.0) (77.0)
Below-market sales contracts - Accumulated Amortization    24.3
Below-market sales contracts - Net Carrying Amount (46.0) (52.7)
Below Market Sales Contracts [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Below-market sales contracts - Gross Carrying Amount (250.7) (252.3)
Below-market sales contracts - Accumulated Amortization 181.6 140.5
Below-market sales contracts - Net Carrying Amount (69.1) (111.8)
Permits [Member] | Intangible Assets, Net [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 136.1 134.3
Definite lived intangible assets - Accumulated Amortization (31.7) (23.2)
Definite lived intangible assets - Net Carrying Amount 104.4 111.1
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 (32.4) (21.3)
Definite lived intangible assets - Net Carrying Amount 22.3 33.4
Leases [Member] | Intangible Assets, Net [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Definite lived intangible assets - Gross Carrying Amount 5.7 5.5
Definite lived intangible assets - Accumulated Amortization (3.4) (3.0)
Definite lived intangible assets - Net Carrying Amount $ 2.3 $ 2.5