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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share Reconciliation [Abstract] |  |
Net income attributable to ATI | $ 58.0 | $ 17.5
4.75% Convertible Senor Notes due 2022 | 3.2 | 3.0
Net income attributable to ATI after assumed conversions | $ 61.2 | $ 20.5
Denominator for basic net income per common share – weighted average shares | 125.0 | 107.5
Share-based compensation | 0.6 | 0.8
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022 | 19.9 | 19.9
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 145.5 | 128.2
Basic net income attributable to ATI per common share (in dollars per share) | $ 0.46 | $ 0.16
Diluted net income attributable to ATI per common share (in dollars per share) | $ 0.42 | $ 0.16
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

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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 -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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