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Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details)

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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current $ 3.6 $ 21.3
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent 200.1 202.5
U.S. Iron Ore [Member] Ìý Ìý
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) (26.2) Ìý
Asia Pacific Iron Ore [Member] Ìý Ìý
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current Ìý $ 17.7
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) $ (10.1) Ìý