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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)

v2.4.0.6
Goodwill And Other Intangible Assets And Liabilities (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items] Ìý Ìý
Definite lived intangible assets - Gross Carrying Amount $ 195.3 $ 194.5
Definite lived intangible assets - Accumulated Amortization (52.3) (47.5)
Definite lived intangible assets - Net Carrying Amount 143.0 147.0
Below-market sales contracts - Gross Carrying Amount (293.4) (329.3)
Below-market sales contracts - Accumulated Amortization 134.2 164.8
Below-market sales contracts - Net Carrying Amount (159.2) (164.5)
Permits [Member]
Ìý Ìý
Finite-Lived Intangible Assets [Line Items] Ìý Ìý
Classification of intangible assets and liabilities Intangible assets, net Ìý
Definite lived intangible assets - Gross Carrying Amount 135.1 134.3
Definite lived intangible assets - Accumulated Amortization (25.2) (23.2)
Definite lived intangible assets - Net Carrying Amount 109.9 111.1
Utility Contracts [Member]
Ìý Ìý
Finite-Lived Intangible Assets [Line Items] Ìý Ìý
Classification of intangible assets and liabilities Intangible assets, net Ìý
Definite lived intangible assets - Gross Carrying Amount 54.7 54.7
Definite lived intangible assets - Accumulated Amortization (24.1) (21.3)
Definite lived intangible assets - Net Carrying Amount 30.6 33.4
Leases [Member]
Ìý Ìý
Finite-Lived Intangible Assets [Line Items] Ìý Ìý
Classification of intangible assets and liabilities Intangible assets, net Ìý
Definite lived intangible assets - Gross Carrying Amount 5.5 5.5
Definite lived intangible assets - Accumulated Amortization (3.0) (3.0)
Definite lived intangible assets - Net Carrying Amount 2.5 2.5
Below Market Sales Contracts [Member]
Ìý Ìý
Finite-Lived Intangible Assets [Line Items] Ìý Ìý
Classification of intangible assets and liabilities Below-market sales contracts Ìý
Below-market sales contracts - Gross Carrying Amount (247.4) (252.3)
Below-market sales contracts - Accumulated Amortization 134.2 140.5
Below-market sales contracts - Net Carrying Amount (113.2) (111.8)
Below-Market Sales Contracts Current [Member]
Ìý Ìý
Finite-Lived Intangible Assets [Line Items] Ìý Ìý
Classification of intangible assets and liabilities Other current liabilities Ìý
Below-market sales contracts - Gross Carrying Amount (46.0) (77.0)
Below-market sales contracts - Accumulated Amortization Ìý 24.3
Below-market sales contracts - Net Carrying Amount $ (46.0) $ (52.7)