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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share Reconciliation [Abstract]
Net income (loss) attributable to ATI	$ 17.5	$ (101.2)
4.75% Convertible Senor Notes due 2022	3.0	0.0
Net income (loss) attributable to ATI after assumed conversions	$ 20.5	$ (101.2)
Denominator for basic net income (loss) per common share – weighted average shares	107.5	107.3
Share-based compensation	0.8	0.0
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022	19.9	0.0
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions	128.2	107.3
Basic net income (loss) attributable to ATI per common share (in dollars per share)	$ 0.16	$ (0.94)
Diluted net income (loss) attributable to ATI per common share (in dollars per share)	$ 0.16	$ (0.94)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	0.0	0.8

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