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Per Share Information | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Per Share Information | Per Share Information The following table sets forth the computation of basic and diluted net loss per common share: (In millions, except per share amounts)
For the Years Ended December 31, |  | 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |  |
Numerator for basic net loss per common share - |  |  |  |  |  |
Net loss attributable to ATI |  | $ | (91.9 | ) |  | $ | (640.9 | ) |  | $ | (377.9 | )
Redeemable noncontrolling interest (Note 17) |  | — |  |  | — |  |  | (0.3 | )
Effect of dilutive securities: |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 |  | — |  |  | — |  |  | — |
Numerator for diluted net loss per common share - |  |  |  |  |  |
Net loss attributable to ATI after assumed conversions |  | $ | (91.9 | ) |  | $ | (640.9 | ) |  | $ | (378.2 | )
Denominator: |  |  |  |  |  |
Denominator for basic net loss per common share—weighted average shares |  | 110.1 |  |  | 107.3 |  |  | 107.3 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation |  | — |  |  | — |  |  | — |
4.75% Convertible Senior Notes due 2022 |  | — |  |  | — |  |  | — |
Denominator for diluted net loss per common share—adjusted weighted average shares and assumed conversions |  | 110.1 |  |  | 107.3 |  |  | 107.3 |
Basic net loss attributable to ATI per common share |  | $ | (0.83 | ) |  | $ | (5.97 | ) |  | $ | (3.53 | )
Diluted net loss attributable to ATI per common share |  | $ | (0.83 | ) |  | $ | (5.97 | ) |  | $ | (3.53 | )
Common stock that would be issuable upon the assumed conversion of the 2022 Convertible Notes and other option equivalents and contingently issuable shares are excluded from the computation of contingently issuable shares, and therefore, from the denominator for diluted earnings per share, if the effect of inclusion would have been anti-dilutive. Excluded shares were 20.8 million for 2017, 13.1 million for 2016 and 0.8 million for 2015.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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