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Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details)

v3.7.0.1
GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Cost of Sales [Member] Ìý Ìý Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý Ìý Ìý
Amortization expense relating to intangible assets $ 0.4 $ 1.2 $ 1.0 $ 2.6 Ìý
U.S. Iron Ore [Member] Ìý Ìý Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý Ìý Ìý
Goodwill $ 2.0 Ìý $ 2.0 Ìý $ 2.0