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.