Environmental And Mine Closure Obligations (Summary Of Mine Closure Obligations) (Details) (USD $) In Millions |
Sep. 30, 2011 |
Dec. 31, 2010 |
|---|---|---|
| Environmental | $ 15.0 | $ 13.7 |
| Mine closure | 210.2 | 185.4 |
| Total environmental and mine closure obligations | 225.2 | 199.1 |
| Less current portion | 14.7 | 14.2 |
| Long-term environmental and mine closure obligations | 210.5 | 184.9 |
Mine Closure [Member] | LTV Steel Mining Company [Member] |
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| Mine closure | 17.9 | 17.1 |
U.S. Iron Ore [Member] | Owned Or Operating Facilities [Member] |
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| Mine closure | 67.5 | 62.7 |
Eastern Canadian Iron Ore [Member] | Owned Or Operating Facilities [Member] |
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| Mine closure | 67.8 | 49.3 |
Asia Pacific Iron Ore [Member] | Owned Or Operating Facilities [Member] |
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| Mine closure | 15.2 | 15.4 |
North American Coal [Member] | Owned Or Operating Facilities [Member] |
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| Mine closure | 35.6 | 34.7 |
Owned Or Operating Facilities [Member] | Other Regions [Member] |
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| Mine closure | $ 6.2 | $ 6.2 |
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- Definition Environmental Loss Contingency And Mine Reclamation And Closing Liability Current
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- Definition Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent
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- Definition Mine Reclamation and Closing Liability
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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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- 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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