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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
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Sep. 30, 2013
U.S. Iron Ore [Member]
Facility
|
Sep. 30, 2013
Eastern Canadian Iron Ore [Member]
Facility
|
Sep. 30, 2013
Asia Pacific Iron Ore [Member]
Facility
|
Sep. 30, 2013
North American Coal [Member]
Facility
|
Sep. 30, 2013
LTV Steel Mining Company [Member]
Facility
|
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| Loss Contingencies [Line Items] | |||||||
| Total environmental and mine closure obligations | $ 310.2 | $ 265.1 | |||||
| Mine closure obligation, number of mines (in number of facilities) | 4 | 2 | 1 | 5 | 1 | ||
| 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.
|
| X | ||||||||||
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- Details
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