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Debt - Revolving Credit Facility Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2024
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% 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 0     0    
Amount utilized to support the issuance of letters of credit 35,200,000          
Average borrowings during period $ 58,000,000 $ 0        
Interest rate during period 2.20%          
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 500,000,000          
Debt Instrument, Covenant, Fixed Coverage Ratio Restriction, Maximum Borrowing Capacity $ 87,500,000          
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 200,000,000     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%          
Delayed-Draw Term Loan            
Debt Instrument [Line Items]            
Outstanding borrowings $ 100,000,000          
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022            
Debt Instrument [Line Items]            
Outstanding borrowings $ 84,200,000     $ 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      
[1] Bearing interest at 7.875% effective February 15, 2016.