Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 94.3	$ 51.1
Short-term investments	88.4	183.7
Receivables:
Trade receivables, net	194.5	165.0
Other	24.4	15.5
Contract assets	51.0	0.0
Inventories	196.2	207.9
Prepaid expenses and other current assets	24.2	33.4
Total current assets	673.0	656.6
Property, plant and equipment, net	595.4	571.4
Deferred tax assets, net	42.2	72.0
Intangible assets, net	33.0	25.0
Goodwill	43.4	18.8
Other assets	39.0	41.4
Total	1,426.0	1,385.2
Current liabilities:
Accounts payable	120.4	90.0
Accrued salaries, wages and related expenses	35.1	42.6
Other accrued liabilities	37.0	40.5
Total current liabilities	192.5	173.1
Net liabilities of Salaried VEBA	31.8	31.9
Deferred tax liabilities	4.3	4.3
Long-term liabilities	64.7	60.0
Long-term debt	370.2	369.6
Total liabilities	663.5	638.9
Commitments and contingencies
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized at both September 30, 2018 and December 31, 2017; no shares were issued and outstanding at September 30, 2018 and December 31, 2017	0.0	0.0
Common stock, par value $0.01, 90,000,000 shares authorized at both September 30, 2018 and at December 31, 2017; 22,471,628 shares issued and 16,547,237 shares outstanding at September 30, 2018; 22,393,537 shares issued and 16,773,586 shares outstanding at December 31, 2017	0.2	0.2
Additional paid in capital	1,057.4	1,055.9
Retained earnings	135.6	85.5
Treasury stock, at cost, 5,924,391 shares at September 30, 2018 and 5,619,951 shares at December 31, 2017, respectively	(390.9)	(358.6)
Accumulated other comprehensive loss	(39.8)	(36.7)
Total stockholders' equity	762.5	746.3
Total	$ 1,426.0	$ 1,385.2