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Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)

v2.4.0.8
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Sep. 30, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Sep. 30, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Sep. 30, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Sep. 30, 2014
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Sep. 30, 2013
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Sep. 30, 2014
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Sep. 30, 2013
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Product Revenues [Member]
Sep. 30, 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]
Sep. 30, 2014
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Sep. 30, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Cost of Sales [Member]
Sep. 30, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Cost of Sales [Member]
Sep. 30, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Cost of Sales [Member]
Sep. 30, 2013
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Cost of Sales [Member]
Sep. 30, 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]
Sep. 30, 2014
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Sep. 30, 2014
Interest Rate Swap [Member]
Other Nonoperating Income (Expense) [Member]
Sep. 30, 2013
Interest Rate Swap [Member]
Other Nonoperating Income (Expense) [Member]
Sep. 30, 2014
Interest Rate Swap [Member]
Other Nonoperating Income (Expense) [Member]
Sep. 30, 2013
Interest Rate Swap [Member]
Other Nonoperating Income (Expense) [Member]
Jun. 30, 2014
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Sep. 30, 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]
Sep. 30, 2014
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member]
Not Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Sep. 30, 2014
Foreign Exchange Contract [Member]
Cost of Sales [Member]
Sep. 30, 2013
Foreign Exchange Contract [Member]
Cost of Sales [Member]
Sep. 30, 2014
Foreign Exchange Contract [Member]
Cost of Sales [Member]
Sep. 30, 2013
Foreign Exchange Contract [Member]
Cost of Sales [Member]
Sep. 30, 2014
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Sep. 30, 2013
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Sep. 30, 2014
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Sep. 30, 2013
Customer Supply Agreement [Member]
Not Designated as Hedging Instrument [Member]
Product Revenues [Member]
Sep. 30, 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]
Sep. 30, 2014
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
Sep. 30, 2013
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
Sep. 30, 2014
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
Sep. 30, 2013
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
Sep. 30, 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]
Sep. 30, 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]
Sep. 30, 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]
Sep. 30, 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]
Sep. 30, 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]
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]
Sep. 30, 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, Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member]
Derivative Financial Instruments, Liabilities [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
Derivative, Notional Amount Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 285.0 $ 323.0 Ìý Ìý Ìý Ìý Ìý $ 257.4 $ 285.9 Ìý Ìý Ìý Ìý Ìý $ 250.0 $ 0 $ 74.8 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 0.1 0.1 0.3 0.1 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
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 59.5 75.5 98.0 103.9 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 0 0 (3.3) 0 Ìý Ìý Ìý Ìý Ìý Ìý (3.1) 24.3 (23.3) (6.8) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0.6 (16.2) (18.8) (12.0) 0 0 (0.5) 0 1.6 (8.9) (11.2) (4.5) Ìý Ìý Ìý (1.0) (7.3) (7.1) (7.5) 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
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 Ìý Ìý Ìý Ìý Ìý Ìý Ìý (7.4) Ìý Ìý Ìý Ìý Ìý Ìý (5.0) Ìý Ìý Ìý Ìý Ìý Ìý Ìý 0 Ìý Ìý Ìý Ìý 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 62.6 53.9 124.6 113.4 Ìý Ìý Ìý Ìý Ìý Ìý (3.1) 24.3 (23.3) (6.8) Ìý Ìý 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 Ìý 54.5 55.8 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 0 3.1 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 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 23.3 $ 10.3