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v3.6.0.2

Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations, net of tax |  |  |  |  |  |  |  |  | $ (640.9) | $ (377.9) | $ (2.0)
Redeemable noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | (0.3) | (0.3)
Redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Effect of dilutive securities: Convertible Senior Notes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Numerator for diluted net loss per common share - Loss from continuing operations attributable to ATI after assumed conversions |  |  |  |  |  |  |  |  | $ (640.9) | $ (378.2) | $ (2.3)
Denominator for basic net loss per common share - weighted average shares (shares) | 108.9 | 108.9 | 108.9 | 109.0 | 109.2 | 109.2 | 109.2 | 108.9 | 107.3 | 107.3 | 107.1
Effect of dilutive securities: Share-based compensation |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Effect of dilutive securities: Convertible Senior Notes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Denominator for diluted net loss per common share—adjusted weighted average shares and assumed conversions |  |  |  |  |  |  |  |  | 107.3 | 107.3 | 107.1
Basic income (loss) from continuing operations attributable to ATI per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ (5.97) | $ (3.53) | $ (0.02)
Diluted income (loss) from continuing operations attributable to ATI per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ (5.97) | $ (3.53) | $ (0.02)
Anti-dilutive securities excluded from computation of earnings per share amount |  |  |  |  |  |  |  |  | 13.1 | 0.8 | 4.7
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.75% |  |  |  |  |  |  |  | 4.75% |  |
Convertible Debt [Member] | Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.75% |  |  |  |  |  |  |  | 4.75% |  |
Convertible Debt [Member] | Allegheny Technologies $402.5 million 4.25% Convertible Senior Notes due 2014 [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  | 4.25%

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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