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 $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value $ 45,100,000 $ 78,600,000
Derivative liability, fair value 88,600,000 13,200,000
Management Estimate of 62% Fe 62.00%  
Not Designated as Hedging Instrument [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value 45,100,000 62,400,000
Derivative liability, fair value 32,000,000 11,300,000
Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Managements Estimate Of 62% Fee [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Management Estimate of 62% Fe 62.00%  
Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Market Approach [Member] | Provisional Pricing Arrangements [Member] | Managements Estimate Of 62% Fee [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value measurement with unobservable inputs derivative asset range 116  
Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Market Approach [Member] | Provisional Pricing Arrangements [Member] | Managements Estimate Of 62% Fee [Member] | Derivative Financial Instruments Current Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value 900,000 3,500,000
Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Market Approach [Member] | Customer Supply Agreement [Member] | Hot-Rolled Steel Estimate [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, fair value      
Fair value measurement with unobservable inputs derivative asset range 615  
Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Market Approach [Member] | Customer Supply Agreement [Member] | Hot-Rolled Steel Estimate [Member] | Derivative Financial Instruments Current Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value 44,200,000 58,900,000
Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Market Approach [Member] | Customer Supply Agreement [Member] | Hot-Rolled Steel Estimate [Member] | Minimum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value measurement with unobservable inputs derivative asset range 580  
Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Market Approach [Member] | Customer Supply Agreement [Member] | Hot-Rolled Steel Estimate [Member] | Maximum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value measurement with unobservable inputs derivative asset range $ 630