CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 1,006.8	$ 645.9
Accounts receivable, net	502.0	345.8
Short-term contract assets	55.7	38.9
Inventories, net	1,055.8	997.1
Prepaid expenses and other current assets	68.8	38.3
Total current assets	2,689.1	2,066.0
Property, plant and equipment, net	1,487.6	1,469.2
Goodwill	229.0	240.7
Other assets	220.8	259.0
Total assets	4,626.5	4,034.9
Current Liabilities:
Accounts payable	290.7	290.6
Short-term contract liabilities	86.7	111.8
Short-term debt and current portion of long-term debt	606.9	17.8
Other current liabilities	223.0	233.1
Total current liabilities	1,207.3	653.3
Long-term debt	1,683.6	1,550.0
Accrued postretirement benefits	269.4	326.7
Pension liabilities	565.9	673.6
Other long-term liabilities	220.1	189.9
Total liabilities	3,946.3	3,393.5
ATI Stockholders' Equity:
Preferred stock, par value $0.10: authorized-50,000,000 shares; issued-none	0.0	0.0
Common stock, par value $0.10: authorized-500,000,000 shares; issued-127,477,621 shares at September 30, 2021 and 126,820,440 shares at December 31, 2020; outstanding-127,248,348 shares at September 30, 2021 and 126,817,768 shares at December 31, 2020	12.7	12.7
Additional paid-in capital	1,592.1	1,625.5
Retained earnings	102.5	106.5
Treasury stock: 229,273 shares at September 30, 2021 and 2,672 shares at December 31, 2020	(4.8)	0.0
Accumulated other comprehensive loss, net of tax	(1,161.1)	(1,223.6)
Total ATI stockholders’ equity	541.4	521.1
Noncontrolling interests
Noncontrolling interests	138.8	120.3
Total Equity	680.2	641.4
Total Liabilities and Equity	$ 4,626.5	$ 4,034.9