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Debt - Schedule of Debt (Details) (USD $) |  |  |  |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Domestic Bank Group $400 million unsecured credit agreement [Member] | Dec. 31, 2012 Domestic Bank Group $400 million unsecured credit agreement [Member] | Jul. 12, 2013 Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] | Dec. 31, 2013 Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] | Dec. 31, 2012 Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] | Dec. 31, 2013 Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member] | Dec. 31, 2012 Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member] | Dec. 31, 2013 Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member] | Dec. 31, 2012 Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member] | Dec. 31, 2013 Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member] | Dec. 31, 2012 Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member] | Dec. 31, 2013 Allegheny Ludlum 6.95% Debentures due 2025 [Member] | Dec. 31, 2012 Allegheny Ludlum 6.95% Debentures due 2025 [Member] | Dec. 31, 2013 Ladish Series B 6.14% Notes due 2016 [Member] | Dec. 31, 2012 Ladish Series B 6.14% Notes due 2016 [Member] | Dec. 31, 2013 Ladish Series C 6.41% Notes due 2015 [Member] | Dec. 31, 2012 Ladish Series C 6.41% Notes due 2015 [Member] | Dec. 31, 2013 Foreign credit agreements [Member] | Dec. 31, 2012 Foreign credit agreements [Member] | Dec. 31, 2013 Industrial revenue bonds, due through 2020, and other [Member] | Dec. 31, 2012 Industrial revenue bonds, due through 2020, and other [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issuer |  |  |  |  |  | Allegheny Technologies |  | Allegheny Technologies | Allegheny Technologies | Allegheny Technologies | Allegheny Technologies | Allegheny Technologies | Allegheny Technologies | Allegheny Ludlum | Allegheny Ludlum | ATI Ladish, LLC | [1] | ATI Ladish, LLC | [1] | ATI Ladish, LLC | [2] | ATI Ladish, LLC | [2] |  |  |  |
Debt instrument maturity date |  |  |  |  | Aug. 15, 2023 | Aug. 15, 2023 |  |  |  | Jun. 01, 2014 | Jun. 01, 2014 |  |  |  |  | May 16, 2016 | [1] | May 16, 2016 | [1] | Sep. 02, 2015 | [2] | Sep. 02, 2015 | [2] |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 5.875% |  |  | 5.95% | 5.95% | 4.25% | 4.25% | 9.375% | 9.375% | 6.95% | 6.95% | 6.14% | [1] | 6.14% | [1] | 6.41% | [2] | 6.41% | [2] |  |  |  |
Debt instrument carrying amount |  |  |  |  | $ 500,000,000 | $ 500,000,000 | $ 0 | $ 500,000,000 | $ 500,000,000 | $ 402,500,000 | $ 402,500,000 | $ 350,000,000 | $ 350,000,000 | $ 150,000,000 | $ 150,000,000 | $ 18,200,000 | [1] | $ 24,800,000 | [1] | $ 21,100,000 | [2] | $ 32,500,000 | [2] | $ 0 | $ 14,200,000 | $ 5,500,000 | $ 6,100,000
Line of credit facility amount outstanding |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total short-term and long-term debt | 1,947,300,000 | 1,480,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt and current portion of long-term debt | 419,900,000 | 17,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 1,527,400,000 | 1,463,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition fair value adjustment of debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  | $ 1,900,000 |  | $ 1,100,000 |  | $ 2,500,000 |  |  |  |  |
[1] | Includes fair value adjustments of $1.0 million and $1.9 million at December 31, 2013 and December 31, 2012, respectively.
[2] | Includes fair value adjustments of $1.1 million and $2.5 million at December 31, 2013 and December 31, 2012, respectively.

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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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- Definition total of both long-term debt, short-term debt and current portion of long-term debt + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond 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 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Identification of the contractual issuer of the debt instrument (for example, a subsidiary of the reporting entity). + 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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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