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Debt - Schedule of Debt (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 12, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 15, 2015 | [2] | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs | [1] |  | $ (9,500,000) |  | $ (10,900,000) |  |  |
Total short-term and long-term debt |  |  | 1,495,700,000 |  | 1,516,000,000 |  |  |
Short-term debt and current portion of long-term debt |  |  | 3,900,000 |  | 17,800,000 |  |  |
Total long-term debt |  |  | $ 1,491,800,000 |  | 1,498,200,000 |  |  |
Domestic Bank Group $400 million unsecured credit agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  | $ 0 |  |  |
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument issuer | [2] |  | Allegheny Technologies |  | Allegheny Technologies |  |  |
Debt instrument maturity date |  | Aug. 15, 2023 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 6.125% |  | 7.625% | 5.875%
Debt instrument carrying amount |  | $ 500,000,000 | $ 500,000,000 | [2] | $ 500,000,000 | [2] |  |
Allegheny Technologies $500 million 5.95% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument issuer |  |  | Allegheny Technologies |  | Allegheny Technologies |  |  |
Debt instrument interest rate stated percentage |  |  | 5.95% |  | 5.95% |  |  |
Debt instrument carrying amount |  |  | $ 500,000,000 |  | $ 500,000,000 |  |  |
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  | 4.25%
Debt instrument carrying amount |  |  |  |  |  |  |  | $ 402,500,000
Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument issuer |  |  | Allegheny Technologies |  | Allegheny Technologies |  |  |
Debt instrument interest rate stated percentage |  |  | 9.375% |  | 9.375% |  |  |
Debt instrument carrying amount |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |
Allegheny Ludlum 6.95% Debentures due 2025 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument issuer |  |  | Allegheny Ludlum |  | Allegheny Ludlum |  |  |
Debt instrument interest rate stated percentage |  |  | 6.95% |  | 6.95% |  |  |
Debt instrument carrying amount |  |  | $ 150,000,000 |  | $ 150,000,000 |  |  |
Ladish Series B 6.14% Notes due 2016 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument issuer | [3] |  | ATI Ladish, LLC |  | ATI Ladish, LLC |  |  |
Debt instrument interest rate stated percentage | [3] |  | 6.14% |  | 6.14% |  |  |
Debt instrument carrying amount | [3] |  | $ 0 |  | $ 11,900,000 |  |  |
Business acquisition fair value adjustment of debt assumed |  |  |  |  | $ 400,000 |  |  |
Ladish Series C 6.41% Notes due 2015 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument issuer | [4] |  | ATI Ladish, LLC |  | ATI Ladish, LLC |  |  |
Debt instrument interest rate stated percentage | [4] |  | 6.41% |  | 6.41% |  |  |
Debt instrument carrying amount | [4] |  | $ 0 |  | $ 10,300,000 |  |  |
Business acquisition fair value adjustment of debt assumed |  |  |  |  | 300,000 |  |  |
Foreign credit agreements [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  | 1,400,000 |  | 0 |  |  |
Industrial revenue bonds, due through 2020, and other [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  | $ 3,800,000 |  | 4,700,000 |  |  |
Accounting Standard Update 2015-03 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  | $ (10,900,000) |  |  |
[1] | In April 2015, the FASB issued new guidance on the presentation of debt issuance costs. This guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The Company early adopted this new guidance on a retrospective basis in the fourth quarter of fiscal year 2015.
[2] | Bearing interest at 7.625% effective August 15, 2015.
[3] | Includes fair value adjustment of $0.4 million at December 31, 2014.
[4] | Includes fair value adjustment of $0.3 million at December 31, 2014.

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