ÐÇ¿Õ´«Ã½

Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Narrative) (Details)

v3.8.0.1
DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Asset, Current $ 89.5 Ìý $ 89.5 Ìý $ 33.1
Derivative Liability, Current 9.3 Ìý 9.3 Ìý 0.5
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [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 54.4 $ 7.1 123.6 $ 26.8 Ìý
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Assets [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Asset, Current 84.8 Ìý 84.8 Ìý 21.3
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [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 13.1 $ 4.5 32.9 $ 22.9 Ìý
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [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 Asset, Current 4.7 Ìý 4.7 Ìý 10.3
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [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 Liability, Current $ 9.3 Ìý $ 9.3 Ìý $ 0.5