CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 128.0	$ 780.3
Receivables:
Trade receivables, net	305.8	112.8
Other	31.5	11.6
Contract assets	44.4	36.1
Inventories	385.3	152.0
Prepaid expenses and other current assets	35.8	28.6
Total current assets	930.8	1,121.4
Property, plant and equipment, net	1,006.6	627.2
Operating lease assets	38.9	26.5
Intangible assets, net	82.5	26.7
Goodwill	46.2	18.8
Other assets	47.8	44.1
Total	2,152.8	1,864.7
Current liabilities:
Accounts payable	259.6	86.1
Accrued salaries, wages and related expenses	31.9	30.8
Other accrued liabilities	58.9	41.4
Total current liabilities	350.4	158.3
Long-term portion of operating lease liabilities	34.1	25.6
Pension and other postretirement benefits	85.0	1.3
Net liabilities of Salaried VEBA	17.4	17.8
Deferred tax liabilities	15.9	13.9
Long-term liabilities	76.3	77.3
Long-term debt	838.7	838.1
Total liabilities	1,417.8	1,132.3
Commitments and contingencies
Stockholders’ equity:
Preferred stock, 5,000,000 shares authorized at both March 31, 2021 and December 31, 2020; no shares were issued and outstanding at March 31, 2021 and December 31, 2020
Common stock, par value $0.01, 90,000,000 shares authorized at both March 31, 2021 and December 31, 2020; 22,683,224 shares issued and 15,847,938 shares outstanding at March 31, 2021; 22,647,455 shares issued and 15,812,169 shares outstanding at December 31, 2020	0.2	0.2
Additional paid in capital	1,069.3	1,068.6
Retained earnings	151.0	158.2
Treasury stock, at cost, 6,835,286 shares at both March 31, 2021 and December 31, 2020	(475.9)	(475.9)
Accumulated other comprehensive loss	(9.6)	(18.7)
Total stockholders’ equity	735.0	732.4
Total	$ 2,152.8	$ 1,864.7