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Per Share Information | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Per Share Information | Per Share Information The following table sets forth the computation of basic and diluted loss from continuing operations per common share: (In millions, except per share amounts)
For the Years Ended December 31, |  | 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |
Numerator for basic loss from continuing operations per common share - |  |  |  |  |  |
Loss from continuing operations attributable to ATI |  | $ | (640.9 | ) |  | $ | (377.9 | ) |  | $ | (2.0 | )
Redeemable noncontrolling interest (Note 18) |  | — |  |  | (0.3 | ) |  | (0.3 | )
Effect of dilutive securities: |  |  |  |  |  |
Convertible Senior Notes (a) |  | — |  |  | — |  |  | — |
Numerator for diluted net loss per common share - |  |  |  |  |  |
Loss from continuing operations attributable to ATI after assumed conversions |  | $ | (640.9 | ) |  | $ | (378.2 | ) |  | $ | (2.3 | )
Denominator: |  |  |  |  |  |
Denominator for basic net loss per common share—weighted average shares |  | 107.3 |  |  | 107.3 |  |  | 107.1 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation |  | — |  |  | — |  |  | — |
Convertible Senior Notes (a) |  | — |  |  | — |  |  | — |
Denominator for diluted net loss per common share—adjusted weighted average shares and assumed conversions |  | 107.3 |  |  | 107.3 |  |  | 107.1 |
Basic loss from continuing operations attributable to ATI per common share |  | $ | (5.97 | ) |  | $ | (3.53 | ) |  | $ | (0.02 | )
Diluted loss from continuing operations attributable to ATI per common share |  | $ | (5.97 | ) |  | $ | (3.53 | ) |  | $ | (0.02 | )
(a) | For 2016, Convertible Senior Notes represent the Company’s 4.75% Convertible Notes due 2022 and for 2014, the Company’s 4.25% Convertible Notes due 2014, which were paid off at maturity on June 1, 2014.
Common stock that would be issuable upon the assumed conversion of the 2022 Convertible Notes and the 2014 Convertible Notes (prior to maturity on June 1, 2014) 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 13.1 million for 2016, 0.8 million for 2015 and 4.7 million for 2014.

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