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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Net income (loss) attributable to ATI | $ 10.1 | $ (18.8) | $ 27.6 | $ (120.0)
4.75% Convertible Senor Notes due 2022 | 1.8 | 0.0 | 4.8 | 0.0
Net income (loss) attributable to ATI after assumed conversions | $ 11.9 | $ (18.8) | $ 32.4 | $ (120.0)
Denominator for basic net income (loss) per common share – weighted average shares | 107.7 | 107.3 | 107.6 | 107.3
Share-based compensation | 0.7 | 0.0 | 0.8 | 0.0
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022 | 19.9 | 0.0 | 19.9 | 0.0
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions | 128.3 | 107.3 | 128.3 | 107.3
Basic net income (loss) attributable to ATI per common share (in dollars per share) | $ 0.09 | $ (0.18) | $ 0.26 | $ (1.12)
Diluted net income (loss) attributable to ATI per common share (in dollars per share) | $ 0.09 | $ (0.18) | $ 0.25 | $ (1.12)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount | 0.0 | 9.3 | 0.0 | 5.0

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