Quarterly report pursuant to Section 13 or 15(d)

Goodwill And Other Intangible Assets And Liabilities (Summary Of Intangible Assets And Liabilities) (Details)

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Goodwill And Other Intangible Assets And Liabilities (Summary Of Intangible Assets And Liabilities) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Definite lived intangible assets - Gross Carrying Amount $ 191.6 $ 208.0
Definite lived intangible assets - Accumulated Amortization (42.3) (32.2)
Definite lived intangible assets - Net Carrying Amount 149.3 175.8
Below-market sales contracts - Gross Carrying Amount (329.3) (329.3)
Below-market sales contracts - Accumulated Amortization 148.2 107.8
Below-market sales contracts - Net Carrying Amount (181.1) (221.5)
Noncurrent Liabilities [Member]
    
Below-market sales contracts - Gross Carrying Amount (252.3) (252.3)
Below-market sales contracts - Accumulated Amortization 123.9 87.9
Below-market sales contracts - Net Carrying Amount (128.4) (164.4)
Other Current Liabilities [Member]
    
Below-market sales contracts - Gross Carrying Amount (77.0) (77.0)
Below-market sales contracts - Accumulated Amortization 24.3 19.9
Below-market sales contracts - Net Carrying Amount (52.7) (57.1)
Utility Contracts [Member]
    
Definite lived intangible assets - Gross Carrying Amount 54.7 54.7
Definite lived intangible assets - Accumulated Amortization (18.6) (10.2)
Definite lived intangible assets - Net Carrying Amount 36.1 44.5
Easements [Member]
    
Definite lived intangible assets - Gross Carrying Amount   11.7 [1]
Definite lived intangible assets - Accumulated Amortization   (0.4) [1]
Definite lived intangible assets - Net Carrying Amount   11.3 [1]
Lease Agreements [Member]
    
Definite lived intangible assets - Gross Carrying Amount 5.5 5.2
Definite lived intangible assets - Accumulated Amortization (2.9) (2.9)
Definite lived intangible assets - Net Carrying Amount 2.6 2.3
Unpatented Technology [Member]
    
Definite lived intangible assets - Gross Carrying Amount   4.0 [2]
Definite lived intangible assets - Accumulated Amortization   (2.4) [2]
Definite lived intangible assets - Net Carrying Amount   1.6 [2]
Permits [Member]
    
Definite lived intangible assets - Gross Carrying Amount 131.4 132.4
Definite lived intangible assets - Accumulated Amortization (20.8) (16.3)
Definite lived intangible assets - Net Carrying Amount $ 110.6 $ 116.1
[1] Upon the acquistion of Consolidated Thompson this intangible asset is now eliminated through intercompany eliminations. The easement agreement is between Wabush and Consolidated Thompson.
[2] Upon recording the renewaFUEL operations as discontinued operations, this intangible asset was written down in the resulting impairment charge recorded during the third quarter of 2011.