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Debt Narrative (Details) |  |  |  | 9 Months Ended |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 Allegheny Technologies 5.875% Notes due 2023 USD ($) | Jul. 12, 2013 Allegheny Technologies 5.875% Notes due 2023 USD ($) | Dec. 31, 2012 Allegheny Technologies 5.875% Notes due 2023 USD ($) | Sep. 30, 2013 Domestic Bank Group $400 million unsecured credit facility USD ($) | Dec. 31, 2012 Domestic Bank Group $400 million unsecured credit facility USD ($) | Sep. 30, 2013 Seperateletter of Credit Facility USD ($) | Sep. 30, 2013 STAL Revolving Credit Facility USD ($) | Sep. 30, 2013 STAL Revolving Credit Facility CNY | Sep. 30, 2013 STAL Precision Stainless Steel Company Limited | Sep. 30, 2013 STAL Revolving Credit Facility
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.875% |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 400,000,000 |  |  | 33,000,000 | 205,000,000 |  |
Line of Credit Facility, Borrowing Capacity Increase Limit |  |  |  | 100,000,000 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Leverage Ratio, Period One |  |  |  | 4.50 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Two |  |  |  | 4.00 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Three |  |  |  | 3.75 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Four |  |  |  | 3.50 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Interest Coverage Ratio, Period One |  |  |  | 2.00 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Interest Coverage Ratio, Period Two |  |  |  | 1.75 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Interest Coverage Ratio, Period Three |  |  |  | 2.00 |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  | 4.18 |  |  |  |  |  |
Debt Instrument, Covenant, Interest Coverage Ratio |  |  |  | 2.71 |  |  |  |  |  |
Amount of Cash on Hand Used to Reduce the Indebtness Figure used in the Leverage Ratio Calculation |  |  |  | 50,000,000 |  |  |  |  |  |
Long-term Debt, Gross | 500,000,000 |  | 0 | 0 | 0 |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  | 4,000,000 |  |  | 0 |  |  |
Sublimit for letters of credit |  |  |  | 200,000,000 |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  | $ 32,000,000 |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  | 60.00% |
Line of Credit Facility, Expiration Date |  |  |  |  |  |  |  |  |  | Aug. 01, 2014

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