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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2013
LTV Steel Mining Company [Member]
Facility
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Mar. 31, 2013
U.S. Iron Ore [Member]
Facility
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Mar. 31, 2013
Eastern Canadian Iron Ore [Member]
Facility
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Mar. 31, 2013
Asia Pacific Iron Ore [Member]
Facility
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Mar. 31, 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 | $ 252.4 | $ 265.1 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Environmental remediation | 15.4 | 15.7 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Mine Reclamation and Closing Liability, current and noncurrent | $ 237.0 | $ 249.4 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Mine closure obligation, number of mines (in number of facilities) | Ìý | Ìý | 1 | 4 | 2 | 1 | 6 |
| 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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- Definition
Mine Reclamation and Closing Liability, current and noncurrent No definition available.
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| X | ||||||||||
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- Definition
Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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