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Per Share Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations, net of tax | $ (226.9) | $ (144.6) | $ (16.4) | $ 10.0 | $ 19.9 | $ 0.0 | $ (3.8) | $ (18.1) | $ (377.9) | $ (2.0) | $ (98.8)
Redeemable noncontrolling interest |  |  |  |  |  |  |  |  | (0.3) | (0.3) | 0.0
Redeemable noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Effect of dilutive securities: 4.25% Convertible Notes due 2014 |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Numerator for diluted net income (loss) per common share - Income (loss) from continuing operations attributable to ATI after assumed conversions |  |  |  |  |  |  |  |  | $ (378.2) | $ (2.3) | $ (98.8)
Denominator for basic net income per common share - weighted average shares (shares) | 109,171,124 | 109,204,307 | 109,190,876 | 108,854,720 | 108,704,983 | 108,712,682 | 108,628,024 | 108,173,581 | 107,300,000 | 107,100,000 | 106,800,000
Effect of dilutive securities: Share-based compensation |  |  |  |  |  |  |  |  | 0 | 0 | 0
Effect of dilutive securities: 4.25% Convertible Notes due 2014 |  |  |  |  |  |  |  |  | 0 | 0 | 0
Denominator for diluted net loss per common share—adjusted weighted average shares and assumed conversions |  |  |  |  |  |  |  |  | 107,300,000 | 107,100,000 | 106,800,000
Basic income (loss) from continuing operations attributable to ATI per common share (in dollars per share) | $ (2.12) | $ (1.35) | $ (0.15) | $ 0.09 | $ 0.18 | $ 0.00 | $ (0.03) | $ (0.17) | $ (3.53) | $ (0.02) | $ (0.93)
Diluted income (loss) from continuing operations attributable to ATI per common share (in dollars per share) | $ (2.12) | $ (1.35) | $ (0.15) | $ 0.09 | $ 0.18 | $ 0.00 | $ (0.03) | $ (0.17) | $ (3.53) | $ (0.02) | $ (0.93)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount |  |  |  |  |  |  |  |  | 800,000 | 4,700,000 | 10,000,000
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%

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