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Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2016
Goodwill [Line Items] Ìý Ìý Ìý
Product $ 275.6 $ 399.5 Ìý
Cost of Sales [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Amortization expense relating to intangible assets 1.4 $ 1.1 Ìý
Sales Revenue, Goods, Net [Member] | Sales Revenue, Goods, Net [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Product 0.0 Ìý Ìý
U.S. Iron Ore [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Goodwill $ 2.0 Ìý Ìý
Scenario, Forecast [Member] Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý
Future Below Market Sales Contracts Revenue Year One Ìý Ìý $ 23.1