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Debt Narrative (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Feb. 15, 2016
Dec. 31, 2013
Allegheny Technologies 5.875% Notes due 2023 (a)          
Debt Instrument [Line Items]          
Interest rate 7.875%   7.875% 7.875% 5.875%
Outstanding borrowings [1] $ 500,000,000   $ 500,000,000    
Asset-based lending credit facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity 500,000,000        
Domestic Bank Group $400 million asset-based credit facility          
Debt Instrument [Line Items]          
Short-term Debt 0   0    
Amount utilized to support the issuance of letters of credit 35,300,000        
Average borrowings during period 0 $ 53,000,000      
Interest rate during period   3.50%      
Domestic Bank Group $400 million asset-based credit facility | Revolving credit facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 400,000,000        
Minimum fixed charge coverage ratio allowed in event of default 1        
Percentage of borrowing capacity unavailable due to fixed charge coverage ratio covenant 10.00%        
Borrowing capacity unavailable due to fixed charge coverage ratio covenant $ 40,000,000        
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        
2022 Term Loan          
Debt Instrument [Line Items]          
Interest rate 5.44%        
Minimum prepayment increments allowed $ 50,000,000        
Outstanding borrowings 100,000,000   $ 100,000,000    
2022 Term Loan | Interest Rate Swap          
Debt Instrument [Line Items]          
Notional amount of derivative $ 50,000,000        
2022 Term Loan | LIBOR based borrowings          
Debt Instrument [Line Items]          
Variable interest rate (percentage) 2.50%        
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022          
Debt Instrument [Line Items]          
Interest rate 4.75%   4.75%    
Outstanding borrowings $ 287,500,000   $ 287,500,000    
Allegheny Technologies 5.95% Notes due 2021          
Debt Instrument [Line Items]          
Interest rate 5.95%   5.95%    
Outstanding borrowings $ 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        
[1] Bearing interest at 7.875% effective February 15, 2016.