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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.