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Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Narrative) (Details)

v3.7.0.1
DERIVATIVE INSTRUMENTS (Narrative) (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Customer Supply Agreement [Member] | Product Revenues [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative $ 17.8 $ 0.1 Ìý
Customer Supply Agreement [Member] | Derivative Financial Instruments, Assets [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Derivative assets 35.9 Ìý $ 21.3
Provisional Pricing Arrangements [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Product Revenues [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative 15.7 $ (1.5) Ìý
Provisional Pricing Arrangements [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Derivative Financial Instruments, Assets [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Derivative assets 23.5 Ìý 10.3
Provisional Pricing Arrangements [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Derivative Financial Instruments, Liabilities [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Derivative liabilities $ 9.1 Ìý $ 0.5