Financial Information for Subsidiary and Guarantor Parent (I.S.) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS
Sales									$ 5,031.5	$ 5,183.0	$ 4,047.8
Cost of sales									4,338.3	4,369.8	3,557.5
Selling and administrative expenses									377.8	382.1	304.9
Income (loss) before interest, other income and income taxes									315.4	431.1	185.4
Interest expense, net									71.6	92.3	62.7
Other income including equity in income of unconsolidated subsidiaries									0.2	0.6	3.0
Income (loss) before income taxes									244.0	339.4	125.7
Income tax expense									76.2	116.3	47.0
Net income (loss)									167.8	223.1	78.7
Less: Net income (loss) attributable to noncontrolling interests									9.4	8.8	8.0
Net income (loss) attributable to ATI	10.5	35.3	56.4	56.2	31.7	62.3	64.0	56.3	158.4	214.3	70.7
Guarantor Parent
CONSOLIDATED STATEMENTS OF OPERATIONS
Sales									0	0	0
Cost of sales									57.0	27.4	44.0
Selling and administrative expenses									149.0	168.6	126.2
Income (loss) before interest, other income and income taxes									(206.0)	(196.0)	(170.2)
Interest expense, net									60.7	81.6	52.2
Other income including equity in income of unconsolidated subsidiaries									510.7	617.0	348.1
Income (loss) before income taxes									244.0	339.4	125.7
Income tax expense									76.2	116.3	47.0
Net income (loss)									167.8	223.1	78.7
Less: Net income (loss) attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to ATI									167.8	223.1	78.7
Subsidiary
CONSOLIDATED STATEMENTS OF OPERATIONS
Sales									2,031.8	2,363.4	2,056.5
Cost of sales									1,888.2	2,129.2	1,968.4
Selling and administrative expenses									42.6	50.9	28.8
Income (loss) before interest, other income and income taxes									101.0	183.3	59.3
Interest expense, net									10.5	10.4	10.2
Other income including equity in income of unconsolidated subsidiaries									(21.5)	4.1	8.5
Income (loss) before income taxes									69.0	177.0	57.6
Income tax expense									27.5	68.8	20.0
Net income (loss)									41.5	108.2	37.6
Less: Net income (loss) attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to ATI									41.5	108.2	37.6
Non Guarantor Subsidiaries
CONSOLIDATED STATEMENTS OF OPERATIONS
Sales									2,999.7	2,819.6	1,991.3
Cost of sales									2,393.1	2,213.2	1,545.1
Selling and administrative expenses									186.2	162.6	149.9
Income (loss) before interest, other income and income taxes									420.4	443.8	296.3
Interest expense, net									0.4	0.3	0.3
Other income including equity in income of unconsolidated subsidiaries									32.0	2.6	3.8
Income (loss) before income taxes									452.0	446.1	299.8
Income tax expense									177.3	155.1	124.0
Net income (loss)									274.7	291.0	175.8
Less: Net income (loss) attributable to noncontrolling interests									9.4	8.8	8.0
Net income (loss) attributable to ATI									265.3	282.2	167.8
Eliminations
CONSOLIDATED STATEMENTS OF OPERATIONS
Sales									0	0	0
Cost of sales									0	0	0
Selling and administrative expenses									0	0	0
Income (loss) before interest, other income and income taxes									0	0	0
Interest expense, net									0	0	0
Other income including equity in income of unconsolidated subsidiaries									(521.0)	(623.1)	(357.4)
Income (loss) before income taxes									(521.0)	(623.1)	(357.4)
Income tax expense									(204.8)	(223.9)	(144.0)
Net income (loss)									(316.2)	(399.2)	(213.4)
Less: Net income (loss) attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to ATI									$ (316.2)	$ (399.2)	$ (213.4)