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Annual report pursuant to Section 13 and 15(d)

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)

v2.4.0.8
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Dec. 31, 2012
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Dec. 31, 2011
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Dec. 31, 2012
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]
Accumulated Other Comprehensive Income (Loss) [Member]
Dec. 31, 2013
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Dec. 31, 2012
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Dec. 31, 2011
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Dec. 31, 2013
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Dec. 31, 2012
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Dec. 31, 2011
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Dec. 31, 2013
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2012
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]
Accumulated Other Comprehensive Income (Loss) [Member]
Dec. 31, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Dec. 31, 2012
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Dec. 31, 2011
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Dec. 31, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2012
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]
Accumulated Other Comprehensive Income (Loss) [Member]
Dec. 31, 2013
Interest Rate Swap [Member]
Other Nonoperating Income Expense [Member]
Dec. 31, 2013
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2013
Treasury Lock [Member]
Dec. 31, 2012
Treasury Lock [Member]
Dec. 31, 2011
Treasury Lock [Member]
Dec. 31, 2013
Treasury Lock [Member]
Changes in Fair Value of Foreign Currency Contracts, Net [Member]
Dec. 31, 2012
Treasury Lock [Member]
Changes in Fair Value of Foreign Currency Contracts, Net [Member]
Dec. 31, 2011
Treasury Lock [Member]
Changes in Fair Value of Foreign Currency Contracts, Net [Member]
Dec. 31, 2011
Treasury Lock [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2012
Treasury Lock [Member]
Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Dec. 31, 2013
Treasury Lock [Member]
Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Dec. 31, 2013
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Dec. 31, 2012
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Dec. 31, 2011
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Dec. 31, 2013
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments, Assets [Member]
Dec. 31, 2012
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments, Assets [Member]
Sep. 30, 2012
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]
Dec. 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]
Dec. 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]
Derivative Financial Instruments, Assets [Member]
Dec. 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]
Derivative Financial Instruments, Liabilities [Member]
Dec. 31, 2011
Provisional Pricing Arrangements [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore and Eastern Canadian Iron Ore [Member]
Product Revenues [Member]
Dec. 31, 2012
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, 2011
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, 2012
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]
Dec. 31, 2011
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]
Dec. 31, 2011
Provisional Pricing Arrangements [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore and Eastern Canadian Iron Ore [Member]
Accounts Receivable [Member]
Dec. 31, 2011
Provisional Pricing Arrangements [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore [Member]
Product Revenues [Member]
Dec. 31, 2013
$500 Million 3.95% 2018 Senior Notes [Member]
Dec. 31, 2012
$500 Million 3.95% 2018 Senior Notes [Member]
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 100,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Debt Instrument, Face Amount 4,814,800,000 5,497,100,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 500,000,000.0 500,000,000.0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (51,700,000) 25,600,000 1,800,000 (4,100,000) 0 0 Ìý Ìý (34,700,000) 20,200,000 1,800,000 Ìý Ìý Ìý Ìý Ìý Ìý (12,900,000) 6,700,000 ÌýÌý Ìý Ìý Ìý Ìý Ìý ÌýÌý (1,300,000) ÌýÌý Ìý Ìý Ìý Ìý (1,300,000) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (22,100,000) 18,100,000 3,300,000 (1,900,000) 0 0 Ìý Ìý Ìý Ìý Ìý (11,900,000) 14,800,000 2,600,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý (100,000) 0 0 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Derivative, Notional Amount Ìý Ìý Ìý Ìý Ìý Ìý 74,800,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý 323,000,000 400,000,000 Ìý Ìý Ìý Ìý 285,900,000 630,400,000 Ìý Ìý 250,000,000 Ìý Ìý Ìý Ìý Ìý Ìý 200,000,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Debt, length of maturity, years Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 5 years Ìý
Amount that will be reclassified to product revenues in the next 12 months upon settlement of the related contracts Ìý Ìý Ìý Ìý Ìý Ìý Ìý (500,000) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý (15,000,000) Ìý Ìý Ìý Ìý Ìý 2,900,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý (100,000) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 149,200,000 171,400,000 178,000,000 Ìý Ìý (7,800,000) (7,200,000) Ìý Ìý 809,100,000 Ìý Ìý Ìý Ìý Ìý 309,400,000 Ìý Ìý
Derivative assets Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 55,800,000 58,900,000 Ìý Ìý 3,100,000 Ìý Ìý 3,500,000 1,200,000 Ìý Ìý Ìý Ìý Ìý Ìý
Derivative liabilities Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 10,300,000 Ìý Ìý Ìý 11,300,000 19,500,000 Ìý Ìý Ìý Ìý
Accounts receivable, net $ 270,000,000 $ 329,000,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 83,800,000 Ìý Ìý Ìý