ÐÇ¿Õ´«Ã½

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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Customer Supply Agreement [Member] | Product Revenues [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative $ 51.4 $ 19.5 $ 69.2 $ 19.9 Ìý
Customer Supply Agreement [Member] | Derivative Financial Instruments, Assets [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative assets 66.4 Ìý 66.4 Ìý $ 21.3
Provisional Pricing Arrangements [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Product Revenues [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative (35.4) $ 1.8 (19.8) $ 0.3 Ìý
Provisional Pricing Arrangements [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Derivative Financial Instruments, Assets [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative assets 6.1 Ìý 6.1 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 Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative liabilities $ 20.8 Ìý $ 20.8 Ìý $ 0.5