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Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments And Hedging Activities (Narrative) (Details)

v2.4.0.6
Derivative Instruments And Hedging Activities (Narrative) (Details)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Dec. 31, 2011
USD ($)
Mar. 31, 2011
Product Revenues [Member]
USD ($)
Mar. 31, 2012
Foreign Exchange Contract [Member]
USD ($)
Mar. 31, 2011
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2011
Foreign Exchange Contract [Member]
USD ($)
Mar. 31, 2012
Australian Hedge Contracts [Member]
USD ($)
Mar. 31, 2011
Australian Hedge Contracts [Member]
USD ($)
Mar. 31, 2012
Australian Hedge Contracts [Member]
AUD
Mar. 31, 2011
Australian Hedge Contracts [Member]
AUD
Mar. 31, 2012
Canadian Hedge Contracts [Member]
USD ($)
Mar. 31, 2011
Canadian Hedge Contracts [Member]
USD ($)
Mar. 31, 2012
Canadian Hedge Contracts [Member]
CAD
Mar. 31, 2012
Customer Contracts [Member]
USD ($)
Dec. 31, 2011
Customer Contracts [Member]
USD ($)
Mar. 31, 2012
Customer Contracts [Member]
Product Revenues [Member]
USD ($)
Mar. 31, 2011
Customer Contracts [Member]
Product Revenues [Member]
USD ($)
Dec. 31, 2011
Provisional Pricing Arrangements [Member]
USD ($)
Mar. 31, 2012
U.S. Iron Ore, Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member]
USD ($)
Mar. 31, 2012
Eastern Canadian Iron Ore [Member]
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
USD ($)
Mar. 31, 2011
Consolidated Thompson [Member]
Foreign Exchange Contract [Member]
USD ($)
Jan. 11, 2011
Consolidated Thompson [Member]
Foreign Exchange Contract [Member]
CAD
Mar. 31, 2012
Minimum [Member]
Twelve Month [Member]
Mar. 31, 2012
Minimum [Member]
Fifteen Month [Member]
Mar. 31, 2012
Maximum [Member]
Twelve Month [Member]
Percentage of hedging policy allowed anticipated operating cost Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 40.00% 10.00% 75.00%
Description of cash flow hedge risk management The policy allows for hedging of not more thanÌý75 percent, but not less thanÌý40 percent for up to 12 months and not less thanÌý10 percent for up to 15 months, occurring only during the fourth quarter of each year, of forecasted net currency exposures that are probable to occur. 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
Notional amounts of outstanding exchange rate contracts Ìý Ìý Ìý Ìý Ìý Ìý $ 400.0 $ 425.0 Ìý Ìý Ìý $ 518.4 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 20.0 Ìý 4.4 Ìý 3.1 Ìý Ìý Ìý 0.5 Ìý Ìý Ìý Ìý 39.2 24.6 Ìý Ìý 3.0 Ìý Ìý Ìý Ìý Ìý
Foreign currency spot rate Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 1.03 1.03 1.03 Ìý 1.03 1.00 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Gain on foreign currency derivative instruments not designated as hedging instruments 0.3 56.3 Ìý Ìý 0.3 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 28.1 Ìý Ìý Ìý Ìý
Notional amount of foreign currency derivative instruments not designated as hedging instruments Ìý Ìý Ìý Ìý Ìý Ìý 15.0 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 4,700.0 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 4.3 Ìý Ìý Ìý 0.7 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Unrealized gains on cash flow hedging Ìý Ìý Ìý Ìý Ìý Ìý Ìý 3.0 1.9 Ìý Ìý 0.7 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Derivative instruments not designated as hedging instruments, gain Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 23.5 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Derivative assets 78.8 Ìý 82.1 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 65.1 72.9 Ìý Ìý 1.2 4.1 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 19.5 1.1 Ìý Ìý Ìý Ìý Ìý Ìý
Accounts receivable $ 247.2 Ìý $ 304.2 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 83.8 Ìý Ìý Ìý Ìý Ìý Ìý Ìý