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Debt Schedule of Debt (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Feb. 15, 2015 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |
Total Debt |  | $ 1,521,000,000 | $ 1,526,900,000 |  |
Short-term debt and current portion of long-term debt |  | 18,300,000 | 17,800,000 |  |
Long-term debt |  | 1,502,700,000 | 1,509,100,000 |  |
Allegheny Technologies 5.875% Notes due 2023 (a) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | [1] | $ 500,000,000 | $ 500,000,000 |  |
Debt Instrument, Issuer |  | Allegheny Technologies |  |  |
Debt Instrument, Maturity Date |  | Aug. 15, 2023 | Aug. 15, 2023 |  |
Interest rate |  | 6.375% | 6.125% | 6.375% | 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 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 |  |
Interest rate |  | 6.95% |  |  |
ATI Ladish Series B 6.14% Notes due 2016 (b) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | [2] | $ 5,900,000 | 11,900,000 |  |
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt |  | 200,000 | 400,000 |  |
ATI Ladish Series C 6.41% Notes due 2015 (c) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | [3] | 10,100,000 | 10,300,000 |  |
Business Acquisition Purchase Price Allocation Notes Payable and L T Debt |  | 100,000 | 300,000 |  |
Domestic Bank Group $400 million credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 400,000,000 |  |  |
Long-term Debt, Gross |  | 0 | 0 |  |
Foreign credit facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | 0 | 0 |  |
Industrial revenue bonds, due through 2020, and other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | $ 5,000,000 | $ 4,700,000 |  |
ATI Ladish Series B 6.14% Notes due 2016 (b) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Issuer |  | ATI Ladish |  |  |
Debt Instrument, Maturity Date |  | May 16, 2016 | May 16, 2016 |  |
Interest rate |  | 6.14% | 6.14% |  |
ATI Ladish Series C 6.41% Notes due 2015 (c) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Issuer |  | ATI Ladish |  |  |
Debt Instrument, Maturity Date |  | Sep. 02, 2015 | Sep. 02, 2015 |  |
Interest rate |  | 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 |  |
Interest rate |  | 5.95% | 5.95% |  |
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 |  |
Interest rate |  |  | 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 |  |
Interest rate |  | 9.375% | 9.375% |  |
Domestic Bank Group $400 million credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 400,000,000 |  |
[1] | Bearing interest at 6.375% effective February 15, 2015.
[2] | Includes fair value adjustments of $0.2 million at June 30, 2015 and $0.4 million at December 31, 2014.
[3] | Includes fair value adjustments of $0.1 million at June 30, 2015 and $0.3 million at December 31, 2014.

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