CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 283.1	$ 780.3
Receivables:
Trade receivables, net	389.2	112.8
Other	38.9	11.6
Contract assets	46.6	36.1
Inventories	383.2	152.0
Prepaid expenses and other current assets	59.6	28.6
Total current assets	1,200.6	1,121.4
Property, plant and equipment, net	951.9	627.2
Operating lease assets	39.5	26.5
Deferred tax assets, net	1.2
Intangible assets, net	79.6	26.7
Goodwill	39.3	18.8
Other assets	102.4	44.1
Total	2,414.5	1,864.7
Current liabilities:
Accounts payable	344.1	86.1
Accrued salaries, wages and related expenses	39.9	30.8
Other accrued liabilities	55.5	41.4
Total current liabilities	439.5	158.3
Long-term portion of operating lease liabilities	34.4	25.6
Pension and other postretirement benefits	87.0	1.3
Net liabilities of Salaried VEBA	17.0	17.8
Deferred tax liabilities	4.6	13.9
Long-term liabilities	75.8	77.3
Long-term debt	1,035.5	838.1
Total liabilities	1,693.8	1,132.3
Commitments and contingencies
Stockholders’ equity:
Preferred stock, 5,000,000 shares authorized at both June 30, 2021 and December 31, 2020; no shares were issued and outstanding at June 30, 2021 and December 31, 2020
Common stock, par value $0.01, 90,000,000 shares authorized at both June 30, 2021 and December 31, 2020; 22,695,106 shares issued and 15,859,820 shares outstanding at June 30, 2021; 22,647,455 shares issued and 15,812,169 shares outstanding at December 31, 2020	0.2	0.2
Additional paid in capital	1,073.2	1,068.6
Retained earnings	116.9	158.2
Treasury stock, at cost, 6,835,286 shares at both June 30, 2021 and December 31, 2020	(475.9)	(475.9)
Accumulated other comprehensive income (loss)	6.3	(18.7)
Total stockholders’ equity	720.7	732.4
Total	$ 2,414.5	$ 1,864.7