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Fair Value Of Financial Instruments - Narrative (Details) | 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 $402.5 million 4.25% Convertible Senior Notes due 2014 [Member] Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) | 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 Technologies $350 million 9.375% Senior Notes due 2019 [Member] Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) | 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 $500 million 5.95% Senior Notes due 2021 [Member] Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) | 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] Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) | 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 Allegheny Ludlum 6.95% Debentures due 2025 [Member] Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.25% | 4.25% | 4.25% | 9.375% | 9.375% | 9.375% | 5.95% | 5.95% | 5.95% | 5.875% | 5.875% | 6.95% | 6.95% | 6.95%

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- Definition Interest rate stated in the contractual 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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