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Fair Value Of Financial Instruments (Schedule Of Quantitative Inputs And Assumptions For Level 3 Assets And Liabilities) (Detail) (USD $)
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9 Months Ended | |||||
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Sep. 30, 2012
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Jun. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Dec. 31, 2010
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | $ 79,400,000 | $ 165,900,000 | ||||
| Derivative liability, fair value | 13,000,000 | 23,000,000 | ||||
| Fair Value of derivative assets | 55,900,000 | 83,900,000 | 157,900,000 | 67,800,000 | 64,000,000 | 45,600,000 |
| Fair Value of derivative liabilities | 11,700,000 | 15,800,000 | 19,500,000 | 0 | 0 | 0 |
| Management Estimate of 62% Fe | 62.00% | |||||
| Debt Instrument, Basis Spread on Variable Rate | 3.50% | |||||
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Accounts Receivable [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | 83,800,000 | |||||
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Managements Estimate Of 62% Fee [Member] | Market Approach [Member] | Provisional Pricing Arrangements [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Fair value measurement with unobservable inputs derivative asset range | 125 | |||||
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Managements Estimate Of 62% Fee [Member] | Market Approach [Member] | Provisional Pricing Arrangements [Member] | Minimum [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Fair value measurement with unobservable inputs derivative asset range | 105 | |||||
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Managements Estimate Of 62% Fee [Member] | Market Approach [Member] | Provisional Pricing Arrangements [Member] | Maximum [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Fair value measurement with unobservable inputs derivative asset range | 115 | |||||
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Hot-Rolled Steel Estimate [Member] | Market Approach [Member] | Customer Supply Agreement [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Fair value measurement with unobservable inputs derivative asset range | 665 | |||||
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Hot-Rolled Steel Estimate [Member] | Market Approach [Member] | Customer Supply Agreement [Member] | Minimum [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Fair value measurement with unobservable inputs derivative asset range | 635 | |||||
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Hot-Rolled Steel Estimate [Member] | Market Approach [Member] | Customer Supply Agreement [Member] | Maximum [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Fair value measurement with unobservable inputs derivative asset range | 695 | |||||
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Not Designated as Hedging Instrument [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | 57,000,000 | 160,700,000 | ||||
| Derivative liability, fair value | 11,700,000 | 19,500,000 | ||||
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Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | ||||||
| Derivative liability, fair value | ||||||
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Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Derivative Financial Instruments Current Assets [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | 1,200,000 | |||||
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Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Accounts Receivable [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | 83,800,000 | |||||
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Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative liability, fair value | 11,700,000 | 19,500,000 | ||||
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Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Managements Estimate Of 62% Fee [Member] | Market Approach [Member] | Provisional Pricing Arrangements [Member] | Derivative Financial Instruments Current Assets [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | 1,400,000 | |||||
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Not Designated as Hedging Instrument [Member] | Customer Contracts [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative liability, fair value | ||||||
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Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Derivative Financial Instruments Current Assets [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | 72,900,000 | |||||
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Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Hot-Rolled Steel Estimate [Member] | Market Approach [Member] | Customer Contracts [Member] | Derivative Financial Instruments Current Assets [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Derivative asset, fair value | 54,500,000 | |||||
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Empire [Member]
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| Fair Value, Assets And Liabilities Measured On Unobservable Inputs [Line Items] | ||||||
| Accounts, Notes, Loans and Financing Receivable, Net, Noncurrent | $ 10,000,000 | $ 10,000,000 |