CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 138.0	$ 304.6
Accounts receivable, net	681.5	613.3
Total inventories, net	1,537.5	1,536.6
Deferred income taxes	0	0
Prepaid expenses and other current assets	89.4	56.1
Total Current Assets	2,446.4	2,510.6
Property, plant and equipment, net	2,597.2	2,559.9
Cost in excess of net assets acquired	736.3	740.1
Deferred income taxes	31.3	71.5
Other assets	363.1	365.7
Total Assets	6,174.3	6,247.8
Current Liabilities:
Accounts payable	479.4	499.9
Accrued liabilities	280.0	330.5
Deferred income taxes	36.6	24.0
Debt Current	17.1	17.1
Total Current Liabilities	813.1	871.5
Long-term debt	1,462.0	1,463.0
Accrued postretirement benefits	487.8	495.2
Pension liabilities	713.7	721.1
Deferred income taxes	0	0
Other long-term liabilities	101.0	109.9
Total Liabilities	3,577.6	3,660.7
ATI Stockholders' Equity:
Preferred stock, par value $0.10: authorized-50,000,000 shares; issued-none	0	0
Common stock	11.0	11.0
Additional paid-in capital	1,168.5	1,181.7
Retained earnings	2,404.9	2,427.6
Treasury stock	(81.1)	(111.3)
Accumulated other comprehensive loss, net of tax	(1,016.2)	(1,029.4)
Total ATI stockholders' equity	2,487.1	2,479.6
Noncontrolling interests
Noncontrolling interests	109.6	107.5
Total Stockholders' Equity	2,596.7	2,587.1
Total Liabilities and Equity	$ 6,174.3	$ 6,247.8