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Per Share Information (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share Reconciliation [Abstract]                      
Income (loss) from continuing operations, net of tax $ (83.8) $ (28.4) $ 3.7 $ 9.7 $ 16.0 $ 31.3 $ 51.4 $ 51.8 $ (98.8) $ 150.5 $ 202.9
Effect of dilutive securities: 4.25% Convertible Notes due 2014                 0 8.5 9.9
Numerator for diluted net income (loss) per common share - Income (loss) from continuing operations attributable to ATI after assumed conversions                 $ (98.8) $ 159.0 $ 212.8
Denominator for basic net income per common share - weighted average shares (shares) 107,984,535 108,001,306 107,980,753 107,614,468 107,321,941 107,185,585 107,125,436 106,746,877 106,800,000 106,100,000 102,500,000
Effect of dilutive securities: Share-based compensation                 0 900,000 1,800,000
Effect of dilutive securities: 4.25% Convertible Notes due 2014                 0 9,600,000 9,600,000
Denominator for diluted net income per common share—adjusted weighted average shares and assumed conversions                 106,800,000 116,600,000 113,900,000
Basic income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (0.79) $ (0.27) $ 0.04 $ 0.09 $ 0.15 $ 0.30 $ 0.48 $ 0.49 $ (0.93) $ 1.42 $ 1.98
Diluted income (loss) from continuing operations attributable to ATI per common share (in dollars per share) $ (0.79) $ (0.27) $ 0.04 $ 0.09 $ 0.15 $ 0.29 $ 0.46 $ 0.46 $ (0.93) $ 1.36 $ 1.87
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Anti-dilutive securities excluded from computation of earnings per share amount                 10,000,000 0 0
Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member]
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Debt instrument interest rate stated percentage 4.25%       4.25%       4.25% 4.25%