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Environmental And Mine Closure Obligations (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2012
LTV Steel Mining Company [Member]
Facility
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Sep. 30, 2012
U.S. Iron Ore [Member]
Facility
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Sep. 30, 2012
Eastern Canadian Iron Ore [Member]
Facility
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Sep. 30, 2012
North American Coal [Member]
Facility
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Sep. 30, 2012
Asia Pacific Iron Ore [Member]
Facility
|
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| Loss Contingencies [Line Items] | |||||||
| Total environmental and mine closure obligations | $ 242.0 | $ 226.9 | |||||
| Mine closure obligations, number of mines (in number of facilities) | 1 | 4 | 2 | 6 | 1 | ||
| X | ||||||||||
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- Definition
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent No definition available.
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| X | ||||||||||
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- Definition
Mine closure obligations, number of mines No definition available.
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| X | ||||||||||
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- Details
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