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Quarterly report pursuant to Section 13 or 15(d)

Fair Value Of Financial Instruments (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details)

v2.3.0.15
Fair Value Of Financial Instruments (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
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 Ìý
Term Loan $1.25 Billion [Member] | Fair Value [Member]
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Senior notes 922.1 Ìý
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 Ìý
Senior Notes $700 Million due 2021 [Member] | Fair Value [Member]
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Senior notes 705.7 Ìý
Carrying Value [Member]
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Receivables 59.2 [1] 63.2 [1]
Customer borrowings 5.1 4.0
Revolving loan 250.0 Ìý
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 Ìý
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
[1] Includes current portion.