Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation And Significant Accounting Policies (Significant Consolidated Subsidiaries) (Details)

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 9 Months Ended
Sep. 30, 2011
Northshore [Member]
  
Location Minnesota
Ownership Interest 100.00%
Operation Iron Ore
United Taconite [Member]
  
Location Minnesota
Ownership Interest 100.00%
Operation Iron Ore
Wabush [Member]
  
Location Labrador/Quebec, Canada
Ownership Interest 100.00%
Operation Iron Ore
Bloom Lake [Member]
  
Location Quebec, Canada
Ownership Interest 75.00%
Operation Iron Ore
Tilden [Member]
  
Location Michigan
Ownership Interest 85.00%
Operation Iron Ore
Empire [Member]
  
Location Michigan
Ownership Interest 79.00%
Operation Iron Ore
Asia Pacific Iron Ore [Member]
  
Location Western Australia
Ownership Interest 100.00%
Operation Iron Ore
Pinnacle [Member]
  
Location West Virginia
Ownership Interest 100.00%
Operation Coal
Oak Grove [Member]
  
Location Alabama
Ownership Interest 100.00%
Operation Coal
CLCC [Member]
  
Location West Virginia
Ownership Interest 100.00%
Operation Coal
RenewaFUEL [Member]
  
Location Michigan [1]
Ownership Interest 95.00% [1]
Operation Biomass [1]
Freewest [Member]
  
Location Ontario, Canada
Ownership Interest 100.00%
Operation Chromite
Spider [Member]
  
Location Ontario, Canada
Ownership Interest 100.00%
Operation Chromite
[1] On September 27, 2011, we announced our plans to cease the operations of renewaFUEL. See the Discontined Operations disclosure below for further details.