Quarterly report pursuant to Section 13 or 15(d)

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

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3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Cost of Sales [Member]      
Goodwill [Line Items]      
Amortization expense relating to intangible assets $ 0.6 $ 1.4  
U.S. Iron Ore [Member]      
Goodwill [Line Items]      
Goodwill $ 2.0   $ 2.0