Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Schedule Of Quantitative Inputs And Assumptions For Level Betfred3 Assets And Liabilities) (Details)

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12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value $ 78,600,000 $ 165,900,000
Derivative liability, fair value 13,200,000 23,000,000
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 62,400,000 160,700,000
Derivative liability, fair value 11,300,000 19,500,000
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, fair value      
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 120  
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 3,500,000 1,200,000
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] | Other Current Liabilities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, fair value 11,300,000 19,500,000
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] | Minimum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value measurement with unobservable inputs derivative asset range 115  
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] | Maximum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value measurement with unobservable inputs derivative asset range 130  
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 635  
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 58,900,000 72,900,000
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 605  
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 $ 660