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Per Share Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share Reconciliation [Abstract]    
Net income attributable to ATI $ 58.0 $ 17.5
4.75% Convertible Senor Notes due 2022 3.2 3.0
Net income attributable to ATI after assumed conversions $ 61.2 $ 20.5
Denominator for basic net income per common share – weighted average shares 125.0 107.5
Share-based compensation 0.6 0.8
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022 19.9 19.9
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions 145.5 128.2
Basic net income attributable to ATI per common share (in dollars per share) $ 0.46 $ 0.16
Diluted net income attributable to ATI per common share (in dollars per share) $ 0.42 $ 0.16
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 0.0 0.0