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Debt Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2024
Jun. 30, 2020
Dec. 31, 2019
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] $ 500,000,000.0       $ 500,000,000.0    
Domestic Bank Group $500 million asset-based credit facility              
Debt Instrument [Line Items]              
Short-term Debt 300,000,000.0       0    
Amount utilized to support the issuance of letters of credit 35,300,000            
Average borrowings during period $ 53,000,000 $ 0          
Interest rate during period 2.60%            
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 500,000,000            
Minimum fixed charge coverage ratio allowed in event of default 1.00            
Percentage of borrowing capacity unavailable due to fixed charge coverage ratio covenant 12.50%            
Borrowing capacity unavailable due to fixed charge coverage ratio covenant $ 62,500,000            
Minimum required liquidity number of days prior to maturity of Senior Notes 90 days            
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Minimum | LIBOR based borrowings              
Debt Instrument [Line Items]              
Variable interest rate (percentage) 1.25%            
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Minimum | Base rate borrowings              
Debt Instrument [Line Items]              
Variable interest rate (percentage) 0.25%            
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Maximum | LIBOR based borrowings              
Debt Instrument [Line Items]              
Variable interest rate (percentage) 1.75%            
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Maximum | Base rate borrowings              
Debt Instrument [Line Items]              
Variable interest rate (percentage) 0.75%            
Domestic Bank Group $500 million asset-based credit facility | Letter of credit sub-facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 200,000,000            
2024 Term Loan              
Debt Instrument [Line Items]              
Interest rate 4.21%            
Minimum prepayment increments allowed $ 25,000,000            
Outstanding borrowings 100,000,000       $ 100,000,000.0    
2024 Term Loan | Interest Rate Swap              
Debt Instrument [Line Items]              
Notional amount of derivative $ 50,000,000            
2024 Term Loan | LIBOR based borrowings              
Debt Instrument [Line Items]              
Variable interest rate (percentage) 2.00%            
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    
Forecast | Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility              
Debt Instrument [Line Items]              
Line of credit facility, increase to maximum borrowing capacity     $ 200,000,000        
Forecast | Delayed-Draw Term Loan              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 100,000,000      
[1] Bearing interest at 7.875% effective February 15, 2016.