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Debt Narrative (Details)
1 Months Ended 6 Months Ended
Jul. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Feb. 15, 2016
Dec. 31, 2013
Debt Instrument [Line Items]              
Defined benefit plan contributions made   $ 135,000,000          
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     41,200,000        
Average borrowings during period     $ 65,000,000 $ 36,000,000      
Interest rate during period     3.60% 3.376%      
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]              
Minimum prepayment increments allowed     50,000,000        
Outstanding borrowings     $ 100,000,000   $ 100,000,000    
2022 Term Loan | LIBOR based borrowings              
Debt Instrument [Line Items]              
Variable interest rate (percentage)     3.00%        
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    
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        
Subsequent Event | 2022 Term Loan              
Debt Instrument [Line Items]              
Interest rate 5.44%            
Subsequent Event | 2022 Term Loan | Interest Rate Swap              
Debt Instrument [Line Items]              
Notional amount of derivative $ 50,000,000            
Subsequent Event | 2022 Term Loan | LIBOR based borrowings              
Debt Instrument [Line Items]              
Variable interest rate (percentage) 2.50%            
[1] Bearing interest at 7.875% effective February 15, 2016.