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Debt Narrative (Details) | 3 Months Ended |  |  |  | 3 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 Convertible Debt [Member] USD ($) | Dec. 31, 2013 Convertible Debt [Member] USD ($) | Mar. 31, 2014 Allegheny Technologies 5.875% Notes due 2023 USD ($) | Dec. 31, 2013 Allegheny Technologies 5.875% Notes due 2023 USD ($) | Mar. 31, 2014 Domestic Bank Group $400 million unsecured credit facility USD ($) | Dec. 31, 2013 Domestic Bank Group $400 million unsecured credit facility USD ($) | Mar. 31, 2014 Seperateletter of Credit Facility USD ($) | Mar. 31, 2014 STAL Revolving Credit Facility USD ($) | Mar. 31, 2014 STAL Revolving Credit Facility CNY | Mar. 31, 2014 STAL Precision Stainless Steel Company Limited | Mar. 31, 2014 STAL Revolving Credit Facility
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.875% | 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 |  |  |  |  | 4.0 |  |  |  |  |  |
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 |  |  |  |  | 1.91 |  |  |  |  |  |
Debt Instrument, Covenant, Interest Coverage Ratio |  |  |  |  | 5.57 |  |  |  |  |  |
Amount of Cash on Hand Used to Reduce the Indebtness Figure used in the Leverage Ratio Calculation |  |  |  |  | 50,000,000 |  |  |  |  |  |
Long-term Debt, Gross | 402,500,000 | 402,500,000 | 500,000,000 | 500,000,000 | 0 | 0 |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  | 7,000,000 |  |  | 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
Debt Instrument, Convertible, Conversion Ratio | 23.9263 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments | 9,630,336 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ 41.795 |  |  |  |  |  |  |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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