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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net income attributable to ATI	$ 72.8	$ 10.1	$ 130.8	$ 27.6
4.75% Convertible Senor Notes due 2022	3.2	1.8	6.4	4.8
Net income attributable to ATI after assumed conversions	$ 76.0	$ 11.9	$ 137.2	$ 32.4
Denominator for basic net income per common share – weighted average shares	125.2	107.7	125.1	107.6
Share-based compensation	0.7	0.7	0.6	0.8
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022	19.9	19.9	19.9	19.9
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions	145.8	128.3	145.6	128.3
Basic net income attributable to ATI per common share (in dollars per share)	$ 0.58	$ 0.09	$ 1.05	$ 0.26
Diluted net income attributable to ATI per common share (in dollars per share)	$ 0.52	$ 0.09	$ 0.94	$ 0.25
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	0.0	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%		4.75%

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