CONSOLIDATED STATEMENTS OF OPERATIONS (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
CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	$ 1,135.5	$ 1,357.4	$ 2,314.9	$ 2,709.9
Costs and expenses:
Cost of sales	1,031.7	1,158.5	2,096.8	2,304.0
Selling and administrative expenses	82.1	90.7	167.8	194.1
Income (loss) before interest, other income and income taxes	21.7	108.2	50.3	211.8
Interest expense, net	(13.9)	(18.6)	(28.3)	(38.5)
Other income, net	(0.1)	0.1	1.0	0.5
Income before income tax provision (benefit)	7.7	89.7	23.0	173.8
Income tax provision (benefit)	1.1	31.0	4.8	56.8
Net income (loss)	6.6	58.7	18.2	117.0
Less: Net income (loss) attributable to noncontrolling interests	2.2	2.3	3.8	4.4
Net income (loss) attributable to ATI	$ 4.4	$ 56.4	$ 14.4	$ 112.6
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
Dividends declared per common share	$ 0.18	$ 0.18	$ 0.36	$ 0.36