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v3.20.2

Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Net income (loss) attributable to ATI | $ (50.1) | $ 111.0 | $ (451.6) | $ 201.1
Net income (loss) attributable to ATI after assumed conversions | $ (50.1) | $ 114.2 | $ (451.6) | $ 210.8
Denominator for basic net income (loss) per common share – weighted average shares | 126.6 | 125.9 | 126.5 | 125.7
Share-based compensation | 0.0 | 0.9 | 0.0 | 0.8
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions | 126.6 | 146.7 | 126.5 | 146.4
Basic net (loss) income attributable to ATI per common share (in dollars per share) | $ (0.40) | $ 0.88 | $ (3.57) | $ 1.60
Diluted net (loss) income attributable to ATI per common share (in dollars per share) | $ (0.40) | $ 0.78 | $ (3.57) | $ 1.44
Antidilutive Securities Excluded from Computation of Earnings Per Share Amount | 25.0 | 0.0 | 21.9 | 0.0
Allegheny Technologies 4.75% Convertible Senior Notes due 2022 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Convertible Senior Notes- Effect on numerator | $ 0.0 | $ 3.2 | $ 0.0 | $ 9.7
Convertible Senior Notes- Effect on denominator | 0.0 | 19.9 | 0.0 | 19.9
Interest rate | 4.75% |  | 4.75% |
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Convertible Senior Notes- Effect on numerator | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Convertible Senior Notes- Effect on denominator | 0.0 | 0.0 | 0.0 | 0.0

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