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Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Narrative) (Details)

v3.5.0.2
DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 21.3 $ (4.1) $ 20.2 $ (7.9) Ìý
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member] | Not Designated as Hedging Instrument [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative, Notional Amount Ìý Ìý Ìý Ìý $ 0.0
Foreign Exchange Contract [Member] | Other Nonoperating Income (Expense) [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0.0 (3.4) 0.0 2.5 Ìý
Foreign Exchange Contract [Member] | Product Revenues [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0.0 (9.7) 0.0 (9.7) Ìý
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 19.5 0.4 19.9 10.5 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 assets 23.7 Ìý 23.7 Ìý 5.8
Provisional Pricing Arrangements [Member] | Product Revenues [Member] Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 1.8 8.4 0.3 (7.8) Ìý
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 1.8 $ 8.4 0.3 $ (7.8) 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 assets 2.1 Ìý 2.1 Ìý 2.0
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 liabilities $ 2.6 Ìý $ 2.6 Ìý $ 3.4