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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Earnings Per Share Reconciliation [Abstract]
Net income attributable to ATI	$ 15.0	$ 58.0
4.75% Convertible Senor Notes due 2022	0.0	3.2
Net income attributable to ATI after assumed conversions	$ 15.0	$ 61.2
Denominator for basic net income per common share – weighted average shares	125.4	125.0
Share-based compensation	0.7	0.6
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022	0.0	19.9
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions	126.1	145.5
Basic net income attributable to ATI per common share (in dollars per share)	$ 0.12	$ 0.46
Diluted net income attributable to ATI per common share (in dollars per share)	$ 0.12	$ 0.42
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share Amount	19.9	0.0
Allegheny Technologies, Convertible Senior Notes, 4.75%, Due 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate	4.75%		4.75%

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