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Business Segments - Additional Information (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
segment
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Restructuring Cost and Reserve [Line Items]      
Number of business segments | segment 2    
Government sponsored COVID relief income $ 29,000,000    
Gain (Loss) on sale of business (18,300,000) $ 0  
Litigation Reserve 8,600,000 0  
Restructuring charges (credits) (1,100,000) $ 0  
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt      
Restructuring Cost and Reserve [Line Items]      
Debt, Gross 291,400,000   $ 291,400,000
Sheffield, UK Operations      
Restructuring Cost and Reserve [Line Items]      
Gain (Loss) on sale of business (25,100,000)    
Pico Rivera, CA Operations      
Restructuring Cost and Reserve [Line Items]      
Gain (Loss) on sale of assets 6,800,000    
High Performance Materials & Components      
Restructuring Cost and Reserve [Line Items]      
Employee retention credits and Aviation Manufacturing Jobs Protection Program 22,000,000    
Advanced Alloys & Solutions [Member]      
Restructuring Cost and Reserve [Line Items]      
Employee retention credits $ 7,000,000