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)

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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]                      
Fair Value at derivative assets $ 69,200,000 $ 157,900,000 $ 68,100,000 $ 45,600,000   $ 65,100,000 $ 4,100,000        
Fair Value at derivative liabilities (1,100,000) (19,500,000)     1,100,000            
Range (Weighted Average) at derivative assets                 150   700
Fair value measurement with unobservable inputs derivative asset range               $ 130 $ 175 $ 700 $ 750
Description of Location of Price Risk Derivatives on Balance Sheet         Other current liabilities Derivative Assets Derivative Assets