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Debt Narrative (Details) | 6 Months Ended |  |  |  | 6 Months Ended |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) | Jun. 30, 2013 USD ($) | Jun. 30, 2014 Convertible Debt [Member] USD ($) | Dec. 31, 2013 Convertible Debt [Member] USD ($) | Jun. 30, 2014 Allegheny Technologies 5.875% Notes due 2023 USD ($) | Dec. 31, 2013 Allegheny Technologies 5.875% Notes due 2023 USD ($) | Jun. 30, 2014 Domestic Bank Group $400 million unsecured credit facility USD ($) | Dec. 31, 2013 Domestic Bank Group $400 million unsecured credit facility USD ($) | Jun. 30, 2014 Seperateletter of Credit Facility USD ($) | Jun. 30, 2014 STAL Revolving Credit Facility USD ($) | Jun. 30, 2014 STAL Revolving Credit Facility CNY | Jun. 30, 2014 STAL Precision Stainless Steel Company Limited | Jun. 30, 2014 STAL Revolving Credit Facility | Jun. 30, 2014 Allegheny Technologies 4.25% Convertible Notes due 2014 USD ($) | Dec. 31, 2013 Allegheny Technologies 4.25% Convertible Notes due 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,476 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.875% | 5.875% |  |  |  |  |  |  |  |  | 4.25%
Conversion of convertible notes | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |
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 |  |  |  |  |  |  | 4.0 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Two |  |  |  |  |  |  | 3.75 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Leverage Ratio, Period Three |  |  |  |  |  |  | 3.50 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Interest Coverage Ratio, Period One |  |  |  |  |  |  | 2.0 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  |  | 2.06 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Interest Coverage Ratio |  |  |  |  |  |  | 4.61 |  |  |  |  |  |  |  |
Amount of Cash on Hand Used to Reduce the Indebtness Figure used in the Leverage Ratio Calculation |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | 0 | 402,500,000 | 500,000,000 | 500,000,000 | 0 | 0 |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  | 5,000,000 |  |  | 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. 08, 2014 |  |
Debt Instrument, Convertible, Conversion Ratio |  |  | 23.9263 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  | $ 41.795 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities | $ 403,400,000 | $ 5,900,000 |  |  |  |  |  |  |  |  |  |  |  | $ 397,500,000 |

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