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Per Share Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	9.6	0	9.6	0
Earnings Per Share Reconciliation Abstract
Net income (loss) attributable to ATI	$ 4.4	$ 56.4	$ 14.4	$ 112.6
4.25% Convertible Notes due 2014	0	2.1	0	4.4
Net Income Loss Available To Common Stockholders Diluted, Total	$ 4.4	$ 58.5	$ 14.4	$ 117.0
Denominator for basic net income per common share - weighted average shares	106.8	106.1	106.7	106.0
Share-based compensation	0.4	0.9	0.4	0.9
4.25% Convertible Notes due 2014	0	9.6	0	9.6
Weighted Average Number Of Diluted Shares Outstanding, Total	107.2	116.6	107.1	116.5
Basic net income (loss) attributable to ATI per common share	$ 0.04	$ 0.53	$ 0.13	$ 1.06
Diluted net income (loss) attributable to ATI per common share	$ 0.04	$ 0.50	$ 0.13	$ 1.00

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