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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2013
LTV Steel Mining Company [Member]
Facility
|
Jun. 30, 2013
U.S. Iron Ore [Member]
Facility
|
Jun. 30, 2013
Eastern Canadian Iron Ore [Member]
Facility
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Jun. 30, 2013
Asia Pacific Iron Ore [Member]
Facility
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Jun. 30, 2013
North American Coal [Member]
Facility
|
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| Loss Contingencies [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Total environmental and mine closure obligations | $ 248.0 | $ 265.1 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Mine closure obligation, number of mines (in number of facilities) | Ìý | Ìý | 1 | 4 | 2 | 1 | 5 |
| X | ||||||||||
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- Definition
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent No definition available.
|
| 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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