XML 136 R119.htm IDEA: XBRL DOCUMENT v3.20.4
Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 658.3 $ 598.0 $ 770.3 $ 955.5 $ 1,018.6 $ 1,018.7 $ 1,080.4 $ 1,004.8 $ 2,982.1 $ 4,122.5 $ 4,046.6
Gross profit 45.2 38.1 74.7 134.8 169.3 159.7 177.7 131.1 292.8 637.8 630.3
Net income (loss) (1,116.3) (47.0) (419.9) 23.6 60.0 115.3 78.5 16.3 (1,559.6) 270.1 236.7
Net income (loss) attributable to ATI $ (1,121.0) $ (50.1) $ (422.6) $ 21.1 $ 56.5 $ 111.0 $ 75.1 $ 15.0 $ (1,572.6) $ 257.6 $ 222.4
Basic income (loss) attributable to ATI per common share (in dollars per share)                 $ (12.43) $ 2.05 $ 1.78
Basic net income (loss) attributable to ATI per common share (in dollars per share) $ (8.85) $ (0.40) $ (3.34) $ 0.17 $ 0.45 $ 0.88 $ 0.60 $ 0.12 (12.43) 2.05 1.78
Diluted income (loss) attributable to ATI per common share (in dollars per share)                 (12.43) 1.85 1.61
Diluted net income (loss) attributable to ATI per common share (in dollars per share) $ (8.85) $ (0.40) $ (3.34) $ 0.16 $ 0.41 $ 0.78 $ 0.54 $ 0.12 $ (12.43) $ 1.85 $ 1.61
Average shares outstanding (shares) 126.8 126.8 126.7 126.3 126.1 126.1 126.1 125.8 126.5 125.8 125.2