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Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details)

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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items] Ìý Ìý
Environmental $ 4.2 $ 5.5
Mine Reclamation and Closing Liability, current and noncurrent 214.0 165.3
Total environmental and mine closure obligations 218.2 170.8
Less current portion 3.3 5.2
Long term environmental and mine closure obligations 214.9 165.6
U.S. Iron Ore [Member] | Owned Or Operating Facilities [Member] Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý
Mine Reclamation and Closing Liability, current and noncurrent 169.6 120.9
Asia Pacific Iron Ore [Member] | Owned Or Operating Facilities [Member] Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý
Mine Reclamation and Closing Liability, current and noncurrent 20.8 21.5
LTV Steel Mining Company [Member] | Previously Owned Or Operating Facilities [Member] Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý
Mine Reclamation and Closing Liability, current and noncurrent $ 23.6 $ 22.9