|
Fair Value Of Financial Instruments (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Detail) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Long-term debt: | ||
| Long-term debt noncurrent fair value | $ 3,614.1 | $ 3,608.7 |
|
Fair Value [Member]
|
||
| Receivables: | ||
| Receivables | 46.8 | 61.5 |
| Long-term debt: | ||
| Revolving loan | 325.0 | |
| Long-term debt noncurrent fair value | 3,976.1 | 3,820.5 |
|
Fair Value [Member] | Customer Supplemental Payments [Member]
|
||
| Receivables: | ||
| Receivables | 10.5 | 20.8 |
|
Fair Value [Member] | ArcelorMittal USA - Receivable [Member]
|
||
| Receivables: | ||
| Receivables | 26.2 | 30.7 |
|
Fair Value [Member] | Other Credit Receivable [Member]
|
||
| Receivables: | ||
| Receivables | 10.1 | 10.0 |
|
Carrying Value [Member]
|
||
| Receivables: | ||
| Receivables | 44.2 | 58.8 |
| Long-term debt: | ||
| Revolving loan | 325.0 | |
| Long-term debt noncurrent fair value | 3,614.1 | 3,608.7 |
|
Carrying Value [Member] | Customer Supplemental Payments [Member]
|
||
| Receivables: | ||
| Receivables | 11.1 | 22.3 |
|
Carrying Value [Member] | ArcelorMittal USA - Receivable [Member]
|
||
| Receivables: | ||
| Receivables | 23.0 | 26.5 |
|
Carrying Value [Member] | Other Credit Receivable [Member]
|
||
| Receivables: | ||
| Receivables | 10.1 | 10.0 |
|
Term Loan - $1.25 Billion [Member] | Fair Value [Member]
|
||
| Long-term debt: | ||
| Term loan | 847.3 | 897.2 |
|
Term Loan - $1.25 Billion [Member] | Carrying Value [Member]
|
||
| Long-term debt: | ||
| Term loan | 847.3 | 897.2 |
|
Senior Notes - $700 Million [Member] | Fair Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | 753.8 | 726.4 |
|
Senior Notes - $700 Million [Member] | Carrying Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | 699.4 | 699.3 |
|
Senior Notes - $1.3 Billion [Member] | Fair Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | 1,526.4 | 1,399.4 |
|
Senior Notes - $1.3 Billion [Member] | Carrying Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | 1,289.3 | 1,289.2 |
|
Senior Notes - $400 Million [Member] | Fair Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | 461.5 | 448.8 |
|
Senior Notes - $400 Million [Member] | Carrying Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | 398.1 | 398.0 |
|
Senior Notes - $55 Million [Member] | Fair Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | 62.1 | 348.7 |
|
Senior Notes - $55 Million [Member] | Carrying Value [Member]
|
||
| Long-term debt: | ||
| Senior notes | $ 55.0 | $ 325.0 |