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Debt Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Feb. 15, 2016
Dec. 31, 2013
Debt Instrument [Line Items]                  
Payments of Debt Issuance Costs         $ 800,000 $ 10,400,000      
Defined benefit plan contributions made $ 135,000,000 $ 115,000,000   $ 115,000,000          
Allegheny Technologies 5.875% Notes due 2023 (a)                  
Debt Instrument [Line Items]                  
Interest rate     7.875%   7.875%   7.875% 7.875% 5.875%
Outstanding borrowings [1]     $ 500,000,000   $ 500,000,000   $ 500,000,000    
Domestic Bank Group $400 million asset-based credit facility                  
Debt Instrument [Line Items]                  
Short-term Debt     25,000,000   25,000,000   0    
Amount utilized to support the issuance of letters of credit     41,500,000   41,500,000        
Average borrowings during period         $ 46,000,000 $ 109,000,000      
Interest rate during period         3.276% 1.757%      
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility                  
Debt Instrument [Line Items]                  
Payments of Debt Issuance Costs         $ 1,000,000        
Maximum borrowing capacity     $ 400,000,000   $ 400,000,000        
Minimum fixed charge coverage ratio allowed in event of default     1   1        
Percentage of borrowing capacity unavailable due to fixed charge coverage ratio covenant     10.00%   10.00%        
Borrowing capacity unavailable due to fixed charge coverage ratio covenant     $ 40,000,000   $ 40,000,000        
Remaining borrowing capacity unavailable due to fixed charge coverage ratio covenant     $ 50,000,000   50,000,000        
Minimum required liquidity number of days prior to maturity of Senior Notes     91 days            
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | LIBOR based borrowings                  
Debt Instrument [Line Items]                  
Variable interest rate (percentage)     1.75%            
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Minimum | Base rate borrowings                  
Debt Instrument [Line Items]                  
Variable interest rate (percentage)     1.00%            
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | LIBOR based borrowings                  
Debt Instrument [Line Items]                  
Variable interest rate (percentage)     2.25%            
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility | Maximum | Base rate borrowings                  
Debt Instrument [Line Items]                  
Variable interest rate (percentage)     1.50%            
Domestic Bank Group $400 million asset-based credit facility | Letter of credit sub-facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 200,000,000   200,000,000        
2022 Term Loan [Member]                  
Debt Instrument [Line Items]                  
Payments of Debt Issuance Costs         800,000        
Minimum prepayment increments allowed     50,000,000            
Outstanding borrowings     $ 100,000,000   $ 100,000,000   $ 100,000,000    
2022 Term Loan [Member] | LIBOR based borrowings                  
Debt Instrument [Line Items]                  
Variable interest rate (percentage)     3.00%            
Allegheny Technologies 9.375% Notes due 2019                  
Debt Instrument [Line Items]                  
Interest rate     9.375%   9.375%   9.375%    
Outstanding borrowings     $ 350,000,000   $ 350,000,000   $ 350,000,000    
Allegheny Technologies 9.375% Notes due 2019 | Revolving credit facility                  
Debt Instrument [Line Items]                  
Minimum required liquidity prior to maturity of Senior Notes     $ 500,000,000   $ 500,000,000        
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member]                  
Debt Instrument [Line Items]                  
Interest rate     4.75%   4.75%   4.75%    
Outstanding borrowings     $ 287,500,000   $ 287,500,000   $ 287,500,000    
Allegheny Technologies 5.95% Notes due 2021                  
Debt Instrument [Line Items]                  
Interest rate     5.95%   5.95%   5.95%    
Outstanding borrowings     $ 500,000,000   $ 500,000,000   $ 500,000,000    
Allegheny Technologies 5.95% Notes due 2021 | Revolving credit facility                  
Debt Instrument [Line Items]                  
Minimum required liquidity prior to maturity of Senior Notes     $ 700,000,000   $ 700,000,000        
[1] Bearing interest at 7.875% effective February 15, 2016.