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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
Sep. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items] Ìý Ìý
Environmental $ 4.3 $ 5.5
Mine Reclamation and Closing Liability, current and noncurrent 211.0 165.3
Total environmental and mine closure obligations 215.3 170.8
Less current portion 3.4 5.2
Long term environmental and mine closure obligations 211.9 165.6
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 171.5 120.9
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 15.6 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 $ 23.9 $ 22.9