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Debt Schedule of Debt (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Total Debt | $ 1,962,100,000 | $ 1,480,100,000
Short-term debt and current portion of long-term debt | 419,900,000 | 17,100,000
Long-term debt | 1,542,200,000 | 1,463,000,000
Allegheny Technologies 5.875% Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 500,000,000 | 0
Debt Instrument, Interest Rate, Stated Percentage | 5.875% |
Allegheny Technologies 5.95% Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 500,000,000 | 500,000,000
Allegheny Technologies 4.25% Convertible Notes due 2014 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 402,500,000 | 402,500,000
Allegheny Technologies 9.375% Notes due 2019 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 350,000,000 | 350,000,000
Allegheny Ludlum 6.95% debentures due 2025 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 150,000,000 | 150,000,000
Debt Instrument, Interest Rate, Stated Percentage | 6.95% |
ATI Ladish Series B 6.14% Notes due 2016 (a) |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 18,400,000 | 24,800,000
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt | 1,200,000 | 1,900,000
ATI Ladish Series C 6.41% Notes due 2015 (b) |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 21,400,000 | 32,500,000
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt | 1,400,000 | 2,500,000
Domestic Bank Group $400 million unsecured credit facility |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 400,000,000 |
Long-term Debt, Gross | 0 | 0
Foreign credit facilities |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 14,300,000 | 14,200,000
Industrial revenue bonds, due through 2020, and other |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 5,500,000 | 6,100,000
ATI Ladish Series B 6.14% Notes due 2016 (a) |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Issuer | ATI Ladish |
Debt Instrument, Maturity Date | May 16, 2016 | May 16, 2016
Debt Instrument, Interest Rate, Stated Percentage | 6.14% | 6.14%
ATI Ladish Series C 6.41% Notes due 2015 (b) |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Issuer | ATI Ladish |
Debt Instrument, Maturity Date | Sep. 02, 2015 | Sep. 02, 2015
Debt Instrument, Interest Rate, Stated Percentage | 6.41% | 6.41%
Allegheny Technologies 5.95% Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Issuer | Allegheny Technologies |
Debt Instrument, Maturity Date | Jan. 15, 2021 | Jan. 15, 2021
Debt Instrument, Interest Rate, Stated Percentage | 5.95% | 5.95%
Allegheny Technologies 4.25% Convertible Notes due 2014 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Issuer | Allegheny Technologies |
Debt Instrument, Maturity Date | Jun. 01, 2014 | Jun. 01, 2014
Debt Instrument, Interest Rate, Stated Percentage | 4.25% | 4.25%
Industrial revenue bonds, due through 2020, and other |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date Range, End | Jan. 01, 2020 | Jan. 01, 2020
Allegheny Ludlum 6.95% debentures due 2025 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Issuer | Allegheny Ludlum |
Debt Instrument, Maturity Date | Dec. 15, 2025 | Dec. 15, 2025
Debt Instrument, Interest Rate, Stated Percentage |  | 6.95%
Allegheny Technologies 9.375% Notes due 2019 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Issuer | Allegheny Technologies |
Debt Instrument, Maturity Date | Jun. 01, 2019 | Jun. 01, 2019
Debt Instrument, Interest Rate, Stated Percentage | 9.375% | 9.375%
Domestic Bank Group $400 million unsecured credit facility |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 400,000,000

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- Definition The amount of acquisition cost of a business combination allocated to notes payables and long-term debt above or below the face amount of the debt assumed from the acquired entity. + References No definition available. + Details
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