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Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Goodwill [Line Items] Ìý Ìý Ìý Ìý Ìý
Product $ 508.6 $ 542.5 $ 1,237.0 $ 1,399.9 Ìý
Cost of Sales [Member] Ìý Ìý Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý Ìý Ìý
Amortization expense relating to intangible assets 1.2 0.9 3.8 3.1 Ìý
Sales Revenue, Goods, Net [Member] | Sales Revenue, Goods, Net [Member] Ìý Ìý Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý Ìý Ìý
Product 7.7 $ 7.7 15.4 $ 15.4 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 Ìý
Scenario, Forecast [Member] Ìý Ìý Ìý Ìý Ìý
Goodwill [Line Items] Ìý Ìý Ìý Ìý Ìý
Future Below Market Sales Contracts Revenue Year One Ìý Ìý Ìý Ìý $ 7.7