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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share Reconciliation [Abstract]
Net loss attributable to ATI	$ (121.2)	$ (530.8)	$ (93.6)	$ (650.8)
4.75% Convertible Senor Notes due 2022	0.0	0.0	0.0	0.0
Net loss attributable to ATI after assumed conversions	$ (121.2)	$ (530.8)	$ (93.6)	$ (650.8)
Denominator for basic net loss per common share – weighted average shares	107.7	107.3	107.7	107.3
Share-based compensation	0.0	0.0	0.0	0.0
Effective of dilutive securities: 4.75% Convertible Senior Notes due 2022	0.0	0.0	0.0	0.0
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions	107.7	107.3	107.7	107.3
Basic net income (loss) attributable to ATI per common share (in dollars per share)	$ (1.12)	$ (4.95)	$ (0.87)	$ (6.07)
Diluted net income (loss) attributable to ATI per common share (in dollars per share)	$ (1.12)	$ (4.95)	$ (0.87)	$ (6.07)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	20.9	21.0	20.7	10.3

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