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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net |  | $ (4.1) |  | $ 14.4 | $ (7.9) | $ 38.5 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (7.8) |  | (6.6) | (14.1) | (19.4) |
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0.0 |  | (0.2) | 0.0 | (0.5) |
Interest Rate Swap [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net |  |  |  | 0.1 |  | 0.3 |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  | 250.0 |  | 250.0 |
Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Product Revenues [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (1.0) | $ (6.3) | (3.7) | (7.3) | (12.8) |
Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | 10.0 |  |  | 10.0 |  | $ 220.0
Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Designated as Hedging Instrument [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Amount that will be reclassified to product revenues in the next 12 months upon settlement of the related contracts |  | (0.9) |  |  | (0.9) |  |
Australian Dollar Foreign Exchange Contract Prior To De Designation [Member] | Not Designated as Hedging Instrument [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Amount that will be reclassified to product revenues in the next 12 months upon settlement of the related contracts |  | (5.7) |  |  | (5.7) |  |
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] | Cost of Sales [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0.0 |  | (2.7) | 0.0 | (6.1) |
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | 0.0 |  |  | 0.0 |  | 0.0
Foreign Exchange Contract [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | [1] | (3.4) |  | (2.4) | 2.5 | (3.3) |
Foreign Exchange Contract [Member] | Product Revenues [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | [1] | (9.7) |  | 0.0 | (9.7) | 0.0 |
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 |  | 0.4 |  | 34.3 | 10.5 | 62.0 |
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Assets [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative assets |  | 7.5 |  |  | 7.5 |  | 63.2
Provisional Pricing Arrangements [Member] | Product Revenues [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net |  | 8.4 |  | (17.5) | (7.8) | (20.2) |
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 |  | 8.4 |  | (17.5) | (7.8) | (20.2) |
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 |  | 0.2 |  |  | 0.2 |  | 0.0
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 |  | 8.0 |  |  | 8.0 |  | 9.5
Corporate [Member] | Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  |  | (0.2) |  | (0.5) |
Corporate [Member] | Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 21.0 |  |  | $ 21.0 |  | 183.0
Corporate [Member] | Foreign Exchange Contract [Member] | Cost of Sales [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net |  |  |  | $ (2.4) |  | $ (3.3) | $ (7.3)
[1] | At June 30, 2014, the location of the Gain (Loss) Recognized in Income on Derivative for Foreign Exchange Contracts was Cost of goods sold and operating expenses.

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