Fair Value Of Financial Instruments (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) (USD $) In Millions |
Sep. 30, 2011 |
Dec. 31, 2010 |
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| Total long-term debt | $ 3,883.5 | $ 1,713.1 | ||||
Term Loan $1.25 Billion [Member] | Carrying Value [Member] |
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| Senior notes | 922.1 | |||||
Term Loan $1.25 Billion [Member] | Fair Value [Member] |
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| Senior notes | 922.1 | |||||
Senior Notes $1.3 Billion [Member] | Carrying Value [Member] |
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| Senior notes | 1,289.1 | 990.3 | ||||
Senior Notes $1.3 Billion [Member] | Fair Value [Member] |
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| Senior notes | 1,382.8 | 972.5 | ||||
Senior Notes $325 Million [Member] | Carrying Value [Member] |
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| Senior notes | 325.0 | 325.0 | ||||
Senior Notes $325 Million [Member] | Fair Value [Member] |
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| Senior notes | 351.7 | 355.6 | ||||
Senior Notes $400 Million [Member] | Carrying Value [Member] |
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| Senior notes | 398.0 | 397.8 | ||||
Senior Notes $400 Million [Member] | Fair Value [Member] |
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| Senior notes | 439.7 | 422.8 | ||||
Senior Notes $700 Million due 2021 [Member] | Carrying Value [Member] |
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| Senior notes | 699.3 | |||||
Senior Notes $700 Million due 2021 [Member] | Fair Value [Member] |
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| Senior notes | 705.7 | |||||
Carrying Value [Member] |
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| Receivables | 59.2 | [1] | 63.2 | [1] | ||
| Customer borrowings | 5.1 | 4.0 | ||||
| Revolving loan | 250.0 | |||||
| Total long-term debt | 3,888.6 | 1,717.1 | ||||
Carrying Value [Member] | Customer Supplemental Payments [Member] |
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| Receivables | 22.3 | 22.3 | ||||
Carrying Value [Member] | ArcelorMittal USA-Ispat Receivable [Member] |
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| Receivables | 28.1 | 32.8 | ||||
Carrying Value [Member] | Other Credit Receivable [Member] |
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| Receivables | 8.8 | 8.1 | ||||
Fair Value [Member] |
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| Receivables | 62.0 | [1] | 66.5 | [1] | ||
| Customer borrowings | 5.1 | 4.0 | ||||
| Revolving loan | 250.0 | |||||
| Total long-term debt | 4,057.1 | 1,754.9 | ||||
Fair Value [Member] | Customer Supplemental Payments [Member] |
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| Receivables | 20.5 | 19.5 | ||||
Fair Value [Member] | ArcelorMittal USA-Ispat Receivable [Member] |
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| Receivables | 32.7 | 38.9 | ||||
Fair Value [Member] | Other Credit Receivable [Member] |
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| Receivables | $ 8.8 | $ 8.1 | ||||
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- Definition Line Of Credit Facility Revolving Loan
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- Definition Line Of Credit Facility Revolving Loan Fair Value
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity due to the entity from outside sources, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.
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- Definition Fair value as of the balance sheet date of debt not otherwise defined (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.
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- Definition Fair value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.
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- Definition Term Credit Facility Non Current
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- Definition Term Credit Facility Non Current Fair Value
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- Definition The aggregate of amounts due from customers or clients more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date more than one year from the balance sheet date, reduced to their estimated net realizable fair value by an allowance established by the Company of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of debt not otherwise defined (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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