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DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 11.6 | $ 16.0 | $ 49.7 | $ 3.1 |
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 0.0
Foreign Exchange Contract [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 0.0 | (1.1) | 0.0 | (3.6) |
Foreign Exchange Contract [Member] | Product Revenues [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 0.0 | (2.1) | 0.0 | (11.8) |
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Product Revenues [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of gain/(loss) recognized in income on derivative | 7.1 | 11.6 | 26.8 | 22.1 |
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Assets [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets | 28.0 |  | 28.0 |  | 5.8
Provisional Pricing Arrangements [Member] | Product Revenues [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 4.5 | 7.6 | 22.9 | (0.2) |
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Product Revenues [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of gain/(loss) recognized in income on derivative | 4.5 | $ 7.6 | 22.9 | $ (0.2) |
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] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets | 0.4 |  | 0.4 |  | 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] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liabilities | $ 2.7 |  | $ 2.7 |  | $ 3.4

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