XML 71 R62.htm IDEA: XBRL DOCUMENT v3.23.3
Business Segments - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Restructuring Cost and Reserve [Line Items]          
Number of business segments | segment     2    
Government sponsored COVID relief income       $ 34,300,000  
Gain (Loss) on sale of business $ (100,000) $ 0 $ (800,000) (134,200,000)  
Litigation Reserve 0 19,900,000 0 28,500,000  
Restructuring charges (credits) (500,000) (2,600,000) 2,200,000 (5,000,000)  
Loss on asset sales and sales of businesses, net   0   (134,200,000)  
Restructuring and other charges (4,200,000) $ (17,300,000) (14,600,000) (23,500,000)  
Transaction costs from sales of businesses, net of proceeds     (300,000) (2,800,000)  
Start Up Costs          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges (credits) 2,800,000   8,500,000    
Unplanned Outage Costs          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges (credits) 1,900,000   1,900,000    
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    
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 $ 0   $ (600,000)    
High Performance Materials & Components          
Restructuring Cost and Reserve [Line Items]          
Employee retention credits and Aviation Manufacturing Jobs Protection Program       27,500,000  
Advanced Alloys & Solutions          
Restructuring Cost and Reserve [Line Items]          
Employee retention credits       $ 6,800,000