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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]      
Sales $ 2,799.8 $ 2,982.1 $ 4,122.5
Gross profit 333.2 292.8 638.0
Net income (loss) $ (16.2) $ (1,559.6) $ 265.0
Basic income (loss) attributable to ATI per common share (in dollars per share) $ (0.30) $ (12.43) $ 2.01
Basic net income (loss) attributable to ATI per common share (in dollars per share) (0.30) (12.43) 2.01
Diluted income (loss) attributable to ATI per common share (in dollars per share) (0.30) (12.43) 1.81
Diluted net income (loss) attributable to ATI per common share (in dollars per share) $ (0.30) $ (12.43) $ 1.81
Average shares outstanding (shares) 127.1 126.5 125.8