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Quarterly report pursuant to Section 13 or 15(d)

Fair Value Of Financial Instruments (Schedule Of Quantitative Inputs And Assumptions For Level 3 Assets And Liabilities) (Details)

v2.4.0.6
Fair Value Of Financial Instruments (Schedule Of Quantitative Inputs And Assumptions For Level 3 Assets And Liabilities) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Mar. 31, 2012
Provisional Pricing Arrangement [Member]
Mar. 31, 2012
Customer Supply Agreement [Member]
Mar. 31, 2012
Managements Estimate Of 62% Fe [Member]
Market Approach [Member]
Provisional Pricing Arrangement [Member]
Mar. 31, 2012
Managements Estimate Of 62% Fe [Member]
Market Approach [Member]
Provisional Pricing Arrangement [Member]
Minimum [Member]
Mar. 31, 2012
Managements Estimate Of 62% Fe [Member]
Market Approach [Member]
Provisional Pricing Arrangement [Member]
Maximum [Member]
Mar. 31, 2012
Hot-Rolled Steel Estimate [Member]
Market Approach [Member]
Customer Supply Agreement [Member]
Minimum [Member]
Mar. 31, 2012
Hot-Rolled Steel Estimate [Member]
Market Approach [Member]
Customer Supply Agreement [Member]
Maximum [Member]
Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair Value at derivative assets $ 69,200,000 $ 157,900,000 $ 68,100,000 $ 45,600,000 Ìý $ 65,100,000 $ 4,100,000 Ìý Ìý Ìý Ìý
Fair Value at derivative liabilities (1,100,000) (19,500,000) Ìý Ìý 1,100,000 Ìý Ìý Ìý Ìý Ìý Ìý
Range (Weighted Average) at derivative assets Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 150 Ìý 700
Fair value measurement with unobservable inputs derivative asset range Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 130 $ 175 $ 700 $ 750
Description of Location of Price Risk Derivatives on Balance Sheet Ìý Ìý Ìý Ìý Other current liabilities Derivative Assets Derivative Assets Ìý Ìý Ìý Ìý