Quarterly report pursuant to Section 13 or 15(d)

Environmental And Mine Closure Obligations (Summary Of Mine Closure Obligations) (Details)

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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]
   
Mine closure 17.9 17.1
U.S. Iron Ore [Member] | Owned Or Operating Facilities [Member]
   
Mine closure 67.5 62.7
Eastern Canadian Iron Ore [Member] | Owned Or Operating Facilities [Member]
   
Mine closure 67.8 49.3
Asia Pacific Iron Ore [Member] | Owned Or Operating Facilities [Member]
   
Mine closure 15.2 15.4
North American Coal [Member] | Owned Or Operating Facilities [Member]
   
Mine closure 35.6 34.7
Owned Or Operating Facilities [Member] | Other Regions [Member]
   
Mine closure $ 6.2 $ 6.2