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Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Mar. 31, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Mar. 31, 2014
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Mar. 31, 2013
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Mar. 31, 2014
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2013
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2014
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Mar. 31, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Cost of Sales [Member]
Mar. 31, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Cost of Sales [Member]
Mar. 31, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Mar. 31, 2014
Interest Rate Swap [Member]
Other Nonoperating Income Expense [Member]
Mar. 31, 2014
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2014
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2014
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member]
Not Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Mar. 31, 2014
Foreign Exchange Contract [Member]
Cost of Sales [Member]
Mar. 31, 2013
Foreign Exchange Contract [Member]
Cost of Sales [Member]
Mar. 31, 2014
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Mar. 31, 2013
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Mar. 31, 2014
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments, Assets [Member]
Dec. 31, 2013
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments, Assets [Member]
Mar. 31, 2014
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
Mar. 31, 2013
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
Mar. 31, 2014
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]
Mar. 31, 2013
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]
Mar. 31, 2014
Provisional Pricing Arrangements [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore, Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member]
Derivative Financial Instruments, Assets [Member]
Mar. 31, 2014
Provisional Pricing Arrangements [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore, Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member]
Derivative Financial Instruments, Liabilities [Member]
Dec. 31, 2013
Provisional Pricing Arrangements [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore and Eastern Canadian Iron Ore [Member]
Derivative Financial Instruments, Assets [Member]
Dec. 31, 2013
Provisional Pricing Arrangements [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore and Eastern Canadian Iron Ore [Member]
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items] 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Derivative, Notional Amount 听 听 听 听 听 听 $ 315.0 $ 323.0 听 听 听 $ 275.7 $ 285.9 听 听 $ 250.0 $ 38.6 $ 74.8 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net 听 听 听 听 听 听 听 听 听 听 听 听 听 听 0.2 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 20.7 21.2 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 (0.9) 0 听 听 听 听 (6.1) (2.9) 听 听 听 听 听 听
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (12.8) 2.0 (0.3) 0 (9.1) 1.8 听 听 听 (3.4) 0.2 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Amount that will be reclassified to product revenues in the next 12 months upon settlement of the related contracts 听 听 听 听 听 听 听 听 (0.7) 听 听 听 听 (7.3) 听 听 听 听 (0.4) 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Amount of gain/(loss) recognized in income on derivative 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 27.7 24.1 听 听 听 听 (6.1) (2.9) 听 听 听 听
Derivative assets 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 42.0 55.8 听 听 听 听 1.3 听 3.1 听
Derivative liabilities 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 $ 7.4 听 $ 10.3