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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Loss Contingencies [Line Items] | Ìý | Ìý |
| Environmental | $ 15.4 | $ 15.7 |
| Mine Reclamation and Closing Liability, current and noncurrent | 237.0 | 249.4 |
| Total environmental and mine closure obligations | 252.4 | 265.1 |
| Less current portion | 12.0 | 12.3 |
| Long term environmental and mine closure obligations | 240.4 | 252.8 |
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Previously Owned Or Operating Facilities [Member] | LTV Steel Mining Company [Member]
|
Ìý | Ìý |
| Loss Contingencies [Line Items] | Ìý | Ìý |
| Mine closure | 18.7 | 18.3 |
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Owned Or Operating Facilities [Member] | U.S. Iron Ore [Member]
|
Ìý | Ìý |
| Loss Contingencies [Line Items] | Ìý | Ìý |
| Mine closure | 83.1 | 81.2 |
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Owned Or Operating Facilities [Member] | Eastern Canadian Iron Ore [Member]
|
Ìý | Ìý |
| Loss Contingencies [Line Items] | Ìý | Ìý |
| Mine closure | 73.4 | 88.9 |
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Owned Or Operating Facilities [Member] | Asia Pacific Iron Ore [Member]
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Ìý | Ìý |
| Loss Contingencies [Line Items] | Ìý | Ìý |
| Mine closure | 22.7 | 22.4 |
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Owned Or Operating Facilities [Member] | North American Coal [Member]
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Ìý | Ìý |
| Loss Contingencies [Line Items] | Ìý | Ìý |
| Mine closure | $ 39.1 | $ 38.6 |
| X | ||||||||||
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- Definition
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current No definition available.
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| 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
Amount of environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. As well as, the amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas. 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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| X | ||||||||||
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- Definition
Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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