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FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Long-term debt: | ||||||
| Long-term debt, face amount | $ 4,650,000,000 | $ 5,497,100,000 | ||||
| Total long-term debt, carrying value | 3,433,000,000 | 3,960,700,000 | ||||
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Term Loan - $1.25 Billion [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Term Loan Original Amount | 0 | 1,250,000,000 | ||||
| Long-term debt: | ||||||
| Long-term debt, face amount | 847,100,000 | |||||
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Senior Notes - $700 Million [Member]
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| Long-term debt: | ||||||
| Long-term debt, face amount | 700,000,000 | 700,000,000 | ||||
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Senior Notes - $1.3 Billion [Member]
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| Long-term debt: | ||||||
| Long-term debt, face amount | 1,300,000,000.0 | 1,300,000,000.0 | ||||
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Senior Notes - $400 Million [Member]
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| Long-term debt: | ||||||
| Long-term debt, face amount | 400,000,000 | 400,000,000 | ||||
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Senior Notes - $500 Million [Member]
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| Long-term debt: | ||||||
| Long-term debt, face amount | 500,000,000.0 | 500,000,000.0 | ||||
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Revolving Loan [Member]
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| Long-term debt: | ||||||
| Long-term debt, face amount | 1,750,000,000.00 | 1,750,000,000.00 | ||||
| Revolving loan, carrying value | 550,000,000 | [1] | 325,000,000 | [1] | ||
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Significant Other Observable Inputs (Level 2) [Member] | Carrying Value [Member]
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| Receivables: | ||||||
| Receivables, carrying value | 44,600,000 | 52,500,000 | ||||
| Long-term debt: | ||||||
| Total long-term debt, carrying value | 3,433,000,000 | 3,960,700,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Carrying Value [Member] | Customer Supplemental Payments [Member]
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| Receivables: | ||||||
| Receivables, carrying value | 16,700,000 | 22,300,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Carrying Value [Member] | ArcelorMittal USA - Receivable [Member]
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| Receivables: | ||||||
| Receivables, carrying value | 17,400,000 | 19,300,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Carrying Value [Member] | Other Credit Receivable [Member]
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| Receivables: | ||||||
| Receivables, carrying value | 10,500,000 | 10,900,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
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| Receivables: | ||||||
| Receivables, fair value | 45,700,000 | 53,500,000 | ||||
| Long-term debt: | ||||||
| Total long-term debt, fair value | 3,801,100,000 | 4,354,800,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] | Customer Supplemental Payments [Member]
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| Receivables: | ||||||
| Receivables, fair value | 16,100,000 | 21,300,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] | ArcelorMittal USA - Receivable [Member]
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| Receivables: | ||||||
| Receivables, fair value | 19,100,000 | 21,300,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] | Other Credit Receivable [Member]
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| Receivables: | ||||||
| Receivables, fair value | 10,500,000 | 10,900,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Term Loan - $1.25 Billion [Member] | Carrying Value [Member]
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| Long-term debt: | ||||||
| Term loan, carrying value | 0 | 753,000,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Term Loan - $1.25 Billion [Member] | Fair Value [Member]
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| Long-term debt: | ||||||
| Term loan, fair value | 0 | 753,000,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $700 Million [Member] | Carrying Value [Member]
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| Long-term debt: | ||||||
| Senior notes, carrying value | 699,400,000 | 699,400,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $700 Million [Member] | Fair Value [Member]
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| Long-term debt: | ||||||
| Senior notes, fair value | 751,400,000 | 759,400,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $1.3 Billion [Member] | Carrying Value [Member]
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| Long-term debt: | ||||||
| Senior notes, carrying value | 1,289,400,000 | 1,289,400,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $1.3 Billion [Member] | Fair Value [Member]
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| Long-term debt: | ||||||
| Senior notes, fair value | 1,513,200,000 | 1,524,700,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $400 Million [Member] | Carrying Value [Member]
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| Long-term debt: | ||||||
| Senior notes, carrying value | 398,300,000 | 398,200,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $400 Million [Member] | Fair Value [Member]
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| Long-term debt: | ||||||
| Senior notes, fair value | 458,800,000 | 464,300,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $500 Million [Member] | Carrying Value [Member]
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| Long-term debt: | ||||||
| Senior notes, carrying value | 495,900,000 | 495,700,000.0 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Senior Notes - $500 Million [Member] | Fair Value [Member]
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| Long-term debt: | ||||||
| Senior notes, fair value | 527,700,000 | 528,400,000.0 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Revolving Loan [Member] | Carrying Value [Member]
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| Long-term debt: | ||||||
| Revolving loan, carrying value | 550,000,000 | 325,000,000 | ||||
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Significant Other Observable Inputs (Level 2) [Member] | Revolving Loan [Member] | Fair Value [Member]
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| Long-term debt: | ||||||
| Revolving loan, fair value | $ 550,000,000 | $ 325,000,000 | ||||
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