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Fair Value Of Financial Instruments (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2012
Carrying Value [Member]
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Dec. 31, 2011
Carrying Value [Member]
|
Sep. 30, 2012
Carrying Value [Member]
Customer Supplemental Payments [Member]
|
Dec. 31, 2011
Carrying Value [Member]
Customer Supplemental Payments [Member]
|
Sep. 30, 2012
Carrying Value [Member]
ArcelorMittal USA - Receivable [Member]
|
Dec. 31, 2011
Carrying Value [Member]
ArcelorMittal USA - Receivable [Member]
|
Sep. 30, 2012
Carrying Value [Member]
Other Credit Receivable [Member]
|
Dec. 31, 2011
Carrying Value [Member]
Other Credit Receivable [Member]
|
Sep. 30, 2012
Fair Value [Member]
|
Dec. 31, 2011
Fair Value [Member]
|
Sep. 30, 2012
Fair Value [Member]
Customer Supplemental Payments [Member]
|
Dec. 31, 2011
Fair Value [Member]
Customer Supplemental Payments [Member]
|
Sep. 30, 2012
Fair Value [Member]
ArcelorMittal USA - Receivable [Member]
|
Dec. 31, 2011
Fair Value [Member]
ArcelorMittal USA - Receivable [Member]
|
Sep. 30, 2012
Fair Value [Member]
Other Credit Receivable [Member]
|
Dec. 31, 2011
Fair Value [Member]
Other Credit Receivable [Member]
|
Sep. 30, 2012
Term Loan - $1.25 Billion [Member]
Carrying Value [Member]
|
Dec. 31, 2011
Term Loan - $1.25 Billion [Member]
Carrying Value [Member]
|
Sep. 30, 2012
Term Loan - $1.25 Billion [Member]
Fair Value [Member]
|
Dec. 31, 2011
Term Loan - $1.25 Billion [Member]
Fair Value [Member]
|
Sep. 30, 2012
Senior Notes - $700 Million [Member]
Carrying Value [Member]
|
Dec. 31, 2011
Senior Notes - $700 Million [Member]
Carrying Value [Member]
|
Sep. 30, 2012
Senior Notes - $700 Million [Member]
Fair Value [Member]
|
Dec. 31, 2011
Senior Notes - $700 Million [Member]
Fair Value [Member]
|
Sep. 30, 2012
Senior Notes - $1.3 Billion [Member]
Carrying Value [Member]
|
Dec. 31, 2011
Senior Notes - $1.3 Billion [Member]
Carrying Value [Member]
|
Sep. 30, 2012
Senior Notes - $1.3 Billion [Member]
Fair Value [Member]
|
Dec. 31, 2011
Senior Notes - $1.3 Billion [Member]
Fair Value [Member]
|
Sep. 30, 2012
Senior Notes - $400 Million [Member]
|
Dec. 31, 2011
Senior Notes - $400 Million [Member]
Carrying Value [Member]
|
Sep. 30, 2012
Senior Notes - $400 Million [Member]
Fair Value [Member]
|
Dec. 31, 2011
Senior Notes - $400 Million [Member]
Fair Value [Member]
|
Sep. 30, 2012
Senior Notes - $55 Million [Member]
Carrying Value [Member]
|
Dec. 31, 2011
Senior Notes - $55 Million [Member]
Carrying Value [Member]
|
Sep. 30, 2012
Senior Notes - $55 Million [Member]
Fair Value [Member]
|
Dec. 31, 2011
Senior Notes - $55 Million [Member]
Fair Value [Member]
|
Sep. 30, 2012
Revolving Loan [Member]
Carrying Value [Member]
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Dec. 31, 2011
Revolving Loan [Member]
Carrying Value [Member]
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Sep. 30, 2012
Revolving Loan [Member]
Fair Value [Member]
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Dec. 31, 2011
Revolving Loan [Member]
Fair Value [Member]
|
Sep. 30, 2012
Empire [Member]
|
Dec. 31, 2011
Empire [Member]
|
Dec. 31, 2002
Empire [Member]
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|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 9.00% | ||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | prime rate | ||||||||||||||||||||||||||||||||||||||||||||
| Receivables: | |||||||||||||||||||||||||||||||||||||||||||||
| Receivables, carrying value | $ 37.4 | $ 58.8 | $ 5.6 | $ 22.3 | $ 21.2 | $ 26.5 | $ 10.6 | $ 10.0 | $ 21.2 | $ 26.5 | $ 120.0 | ||||||||||||||||||||||||||||||||||
| Notes, Loans and Financing Receivable, Net, Current | 10.0 | 10.0 | |||||||||||||||||||||||||||||||||||||||||||
| Receivables, fair value | 39.3 | 61.5 | 5.2 | 20.8 | 23.5 | 30.7 | 10.6 | 10.0 | 23.5 | 30.7 | |||||||||||||||||||||||||||||||||||
| Long-term debt: | |||||||||||||||||||||||||||||||||||||||||||||
| Term loan | 822.4 | 897.2 | 822.4 | 897.2 | |||||||||||||||||||||||||||||||||||||||||
| Senior notes | 699.4 | 699.3 | 1,289.3 | 1,289.2 | 398.2 | 398.0 | 55.0 | 325.0 | |||||||||||||||||||||||||||||||||||||
| Revolving loan | 250.0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| Senior notes | 772.7 | 726.4 | 1,576.3 | 1,399.4 | 467.4 | 448.8 | 62.8 | 348.7 | |||||||||||||||||||||||||||||||||||||
| Revolving loan | 250.0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| Total long-term debt | $ 3,514.3 | $ 3,608.7 | $ 3,514.3 | $ 3,608.7 | $ 3,951.6 | $ 3,820.5 |