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Per Share Information (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share Reconciliation [Abstract]        
Income (loss) from continuing operations attributable to ATI $ (3.8) $ 3.7 $ (21.9) $ 13.4
4.25% Convertible Notes due 2014 0 0 0 0
Income (loss) from continuing operations available to ATI after assumed conversions $ (3.8) $ 3.7 $ (21.9) $ 13.4
Denominator for basic net income per common share-weighted average shares 107,100,000 106,800,000 107,000,000 106,700,000
Share-based compensation 0 400,000 0 400,000
4.25% Convertible Notes due 2014 0 0 0 0
Denominator for diluted net income per common share – adjusted weighted average shares assuming conversions 107,100,000 107,200,000 107,000,000 107,100,000
Basic income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (0.03) $ 0.04 $ (0.20) $ 0.13
Diluted income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (0.03) $ 0.04 $ (0.20) $ 0.13
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 7,000,000 9,600,000 8,500,000 9,600,000