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