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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net income (loss) attributable to ATI	$ 50.5	$ (121.2)	$ 181.3	$ (93.6)
4.75% Convertible Senor Notes due 2022	3.2	0.0	9.6	0.0
Net income (loss) attributable to ATI after assumed conversions	$ 53.7	$ (121.2)	$ 190.9	$ (93.6)
Denominator for basic net income (loss) per common share – weighted average shares	125.2	107.7	125.1	107.7
Share-based compensation	0.9	0.0	0.7	0.0
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022	19.9	0.0	19.9	0.0
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions	146.0	107.7	145.7	107.7
Basic net income (loss) attributable to ATI per common share (in dollars per share)	$ 0.40	$ (1.12)	$ 1.45	$ (0.87)
Diluted net income (loss) attributable to ATI per common share (in dollars per share)	$ 0.37	$ (1.12)	$ 1.31	$ (0.87)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share Amount	0.0	20.9	0.0	20.7
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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