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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share Reconciliation [Abstract]        
Loss from continuing operations attributable to ATI $ (144.6) $ 0.0 $ (151.0) $ (21.9)
Redeemable noncontrolling interest (0.2) 0.0 (0.3) 0.0
Loss from continuing operations available to ATI after assumed conversions $ (144.8) $ 0.0 $ (151.3) $ (21.9)
Denominator for basic net loss per common share-weighted average shares 107.3 107.2 107.3 107.1
Share-based compensation 0.0 0.8 0.0 0.0
4.25% Convertible Notes due 2014 0.0 0.0 0.0 0.0
Denominator for diluted net loss per common share – adjusted weighted average shares assuming conversions 107.3 108.0 107.3 107.1
Basic income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (1.35) $ 0.00 $ (1.41) $ (0.20)
Diluted income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (1.35) $ 0.00 $ (1.41) $ (0.20)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 0.8 0.0 0.9 6.0