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Per Share Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Feb. 02, 2022
Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Net income (loss) attributable to ATI $ 61.1 $ 48.7 $ 54.0 $ (8.4)    
Net income (loss) attributable to ATI after assumed conversions $ 63.9 $ 52.7 $ 54.0 $ (8.4)    
Denominator for basic net income (loss) per common share – weighted average shares 129.8 127.2 126.9 127.0    
Share-based compensation 2.2 0.8 2.0 0.0    
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions 150.8 152.6 128.9 127.0    
Basic net income (loss) attributable to ATI per common share (in dollars per share) $ 0.47 $ 0.38 $ 0.43 $ (0.07)    
Diluted net income (loss) attributable to ATI per common share (in dollars per share) $ 0.42 $ 0.35 $ 0.42 $ (0.07)    
Antidilutive Securities Excluded from Computation of Earnings Per Share Amount 0.0 0.0 22.5 25.6    
Purchase of treasury stock $ (15.0)   $ (104.9) $ 0.0    
Stock repurchase plan, authorized amount         $ 150.0  
Treasury Stock, Shares, Acquired 0.5   4.0      
ATI Inc. 4.75% Convertible Senior Notes due 2022            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Convertible Senior Notes- Effect on numerator $ 0.0 $ 1.1 $ 0.0 $ 0.0    
Convertible Senior Notes- Effect on denominator 0.0 5.8 0.0 0.0    
Interest rate           4.75%
ATI Inc. 3.5% Convertible Senior Notes due 2025            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Convertible Senior Notes- Effect on numerator $ 2.8 $ 2.9 $ 0.0 $ 0.0    
Convertible Senior Notes- Effect on denominator 18.8 18.8 0.0 0.0    
ATI Inc. 3.5% Convertible Senior Notes due 2025 | Convertible Debt            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Interest rate 3.50%   3.50%     3.50%