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Per Share Information (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share Reconciliation [Abstract]    
Income (loss) from continuing operations attributable to ATI $ (18.1) $ 9.7
4.25% Convertible Notes due 2014 0 0
Income (loss) from continuing operations available to ATI after assumed conversions $ (18.1) $ 9.7
Denominator for basic net income per common share-weighted average shares 107,000,000 106,600,000
Share-based compensation 0 500,000
4.25% Convertible Notes due 2014 0 0
Denominator for diluted net income per common share – adjusted weighted average shares assuming conversions 107,000,000 107,100,000
Basic income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (0.17) $ 0.09
Diluted income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (0.17) $ 0.09
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 10,000,000 9,600,000