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Business Segments - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Restructuring Cost and Reserve [Line Items]            
Number of business segments | segment       2    
Government sponsored COVID relief income     $ 5,600,000   $ 34,300,000  
Gain (Loss) on sale of business $ (700,000)   (115,900,000) $ (700,000) (134,200,000)  
Litigation Reserve 0   0 0 8,600,000  
Restructuring charges (credits) 2,700,000   (1,300,000) 2,700,000 (2,400,000)  
Loss on asset sales and sales of businesses, net     (115,900,000)   (134,200,000)  
Restructuring and other credits (charges) (9,200,000)   1,300,000 (10,400,000) (6,200,000)  
Start Up Costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges (credits) 4,500,000 $ 1,200,000        
Asset Write-offs            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges (credits) 2,000,000          
Facility Closing            
Restructuring Cost and Reserve [Line Items]            
Depreciation 800,000     800,000    
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt            
Restructuring Cost and Reserve [Line Items]            
Debt, Gross 291,400,000     291,400,000   $ 291,400,000
Sheffield, UK Operations            
Restructuring Cost and Reserve [Line Items]            
Gain (Loss) on sale of business         (141,000,000)  
Pico Rivera, CA Operations            
Restructuring Cost and Reserve [Line Items]            
Gain (Loss) on sale of assets         6,800,000  
Northbrook, IL Operations            
Restructuring Cost and Reserve [Line Items]            
Loss on asset sales and sales of businesses, net $ (600,000)     $ (600,000)    
High Performance Materials & Components            
Restructuring Cost and Reserve [Line Items]            
Employee retention credits and Aviation Manufacturing Jobs Protection Program     $ 5,600,000   27,500,000  
Advanced Alloys & Solutions            
Restructuring Cost and Reserve [Line Items]            
Employee retention credits         $ 6,800,000