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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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| Derivative [Line Items] | |||
| Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (5.0) | $ 3.7 | |
| Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 2.0 | 3.6 | |
| Amount of gain/(loss) recognized in income on derivative | (2.0) | ||
| Derivative assets | 66.4 | 78.6 | |
|
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
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| Derivative [Line Items] | |||
| Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 3.2 | 3.0 | |
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Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Product Revenues [Member]
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| Derivative [Line Items] | |||
| Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1.8 | 3.1 | |
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Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Designated as Hedging Instrument [Member]
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| Derivative [Line Items] | |||
| Notional amounts of outstanding exchange rate contracts | 378.0 | 400.0 | |
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Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Designated as Hedging Instrument [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
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| Derivative [Line Items] | |||
| Amount that will be reclassified to product revenues in the next 12 months upon settlement of the related contracts | 8.1 | ||
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Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
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| Derivative [Line Items] | |||
| Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (8.2) | 0.7 | |
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Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] | Cost Of Goods Sold And Operating Expenses [Member]
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| Derivative [Line Items] | |||
| Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0.2 | 0.5 | |
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Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] | Designated as Hedging Instrument [Member]
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| Derivative [Line Items] | |||
| Notional amounts of outstanding exchange rate contracts | 557.3 | 630.4 | |
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Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] | Designated as Hedging Instrument [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
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| Derivative [Line Items] | |||
| Amount that will be reclassified to product revenues in the next 12 months upon settlement of the related contracts | (5.0) | ||
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Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Product Revenues [Member]
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| Derivative [Line Items] | |||
| Amount of gain/(loss) recognized in income on derivative | 24.1 | 39.2 | |
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Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Derivative Assets [Member]
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| Derivative [Line Items] | |||
| Derivative assets | 49.4 | 58.9 | |
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Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U.S. Iron Ore and Asia Pacific Iron Ore [Member] | Product Revenues [Member]
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| Derivative [Line Items] | |||
| Amount of gain/(loss) recognized in income on derivative | (2.9) | ||
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Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U.S. Iron Ore and Asia Pacific Iron Ore [Member] | Derivative Assets [Member]
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| Derivative [Line Items] | |||
| Derivative assets | 3.9 | ||
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Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U.S. Iron Ore and Asia Pacific Iron Ore [Member] | Other Current Liabilities [Member]
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| Derivative [Line Items] | |||
| Derivative liabilities | 6.8 | ||
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Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U.S. Iron Ore, Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member] | Product Revenues [Member]
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| Derivative [Line Items] | |||
| Amount of gain/(loss) recognized in income on derivative | 3.0 | ||
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Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U.S. Iron Ore and Eastern Canadian Iron Ore [Member] | Derivative Assets [Member]
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| Derivative [Line Items] | |||
| Derivative assets | 3.5 | ||
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Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U.S. Iron Ore and Eastern Canadian Iron Ore [Member] | Other Current Liabilities [Member]
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| Derivative [Line Items] | |||
| Derivative liabilities | $ 11.3 | ||