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Per Share Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share Reconciliation [Abstract]        
Net income (loss) attributable to ATI $ 10.1 $ (18.8) $ 27.6 $ (120.0)
4.75% Convertible Senor Notes due 2022 1.8 0.0 4.8 0.0
Net income (loss) attributable to ATI after assumed conversions $ 11.9 $ (18.8) $ 32.4 $ (120.0)
Denominator for basic net income (loss) per common share – weighted average shares 107.7 107.3 107.6 107.3
Share-based compensation 0.7 0.0 0.8 0.0
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022 19.9 0.0 19.9 0.0
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions 128.3 107.3 128.3 107.3
Basic net income (loss) attributable to ATI per common share (in dollars per share) $ 0.09 $ (0.18) $ 0.26 $ (1.12)
Diluted net income (loss) attributable to ATI per common share (in dollars per share) $ 0.09 $ (0.18) $ 0.25 $ (1.12)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 0.0 9.3 0.0 5.0