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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |
Net income attributable to ATI | $ 111.0 | $ 50.5 | $ 201.1 | $ 181.3 |
4.75% Convertible Senor Notes due 2022 | 3.2 | 3.2 | 9.7 | 9.6 |
Net income attributable to ATI after assumed conversions | $ 114.2 | $ 53.7 | $ 210.8 | $ 190.9 |
Denominator for basic net income per common share – weighted average shares | 125.9 | 125.2 | 125.7 | 125.1 |
Share-based compensation | 0.9 | 0.9 | 0.8 | 0.7 |
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022 | 19.9 | 19.9 | 19.9 | 19.9 |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 146.7 | 146.0 | 146.4 | 145.7 |
Basic net income attributable to ATI per common share (in dollars per share) | $ 0.88 | $ 0.40 | $ 1.60 | $ 1.45 |
Diluted net income attributable to ATI per common share (in dollars per share) | $ 0.78 | $ 0.37 | $ 1.44 | $ 1.31 |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share Amount | 0.0 | 0.0 | 0.0 | 0.0 |
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022 |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Interest rate | 4.75% |  | 4.75% |  | 4.75%

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