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Per Share Information
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Per Share Information Per Share Information
The following table sets forth the computation of basic and diluted loss per common share: 
(In millions, except per share amounts)Three months ended June 30,Six months ended June 30,
2021202020212020
Numerator:
Numerator for basic loss per common share –
Net loss attributable to ATI$(49.2)$(422.6)$(57.1)$(401.5)
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022— — — — 
3.5% Convertible Senior Notes due 2025— — — — 
Numerator for diluted loss per common share –
Net loss attributable to ATI after assumed conversions$(49.2)$(422.6)$(57.1)$(401.5)
Denominator:
Denominator for basic net loss per common share – weighted average shares127.1 126.6 127.0 126.4 
Effect of dilutive securities:
Share-based compensation— — — — 
4.75% Convertible Senior Notes due 2022— — — — 
3.5% Convertible Senior Notes due 2025— — — — 
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions127.1 126.6 127.0 126.4 
Basic net loss attributable to ATI per common share$(0.39)$(3.34)$(0.45)$(3.18)
Diluted net loss attributable to ATI per common share$(0.39)$(3.34)$(0.45)$(3.18)
Common stock that would be issuable upon the assumed conversion of the 2022 Convertible Notes and the 2025 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 is anti-dilutive. There were 25.7 million anti-dilutive shares for the three and six months ended June 30, 2021, and 20.5 million and 20.4 million anti-dilutive shares for the three and six months ended June 30, 2020, respectively.