Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 135.0	$ 51.1
Short-term investments	83.8	183.7
Receivables:
Trade receivables, net	185.3	165.0
Other	18.2	15.5
Contract with Customer, Asset, Net, Current	57.5	0.0
Inventories	176.8	207.9
Prepaid expenses and other current assets	25.7	33.4
Total current assets	682.3	656.6
Property, plant and equipment, net	578.7	571.4
Deferred tax assets, net	63.7	72.0
Intangible assets, net	24.6	25.0
Goodwill	18.8	18.8
Other assets	37.3	41.4
Total	1,405.4	1,385.2
Current liabilities:
Accounts payable	120.2	90.0
Accrued salaries, wages and related expenses	28.7	42.6
Other accrued liabilities	35.6	40.5
Total current liabilities	184.5	173.1
Net liabilities of Salaried VEBA	31.9	31.9
Deferred tax liabilities	4.3	4.3
Long-term liabilities	61.3	60.0
Long-term debt	369.8	369.6
Total liabilities	651.8	638.9
Commitments and contingencies
Stockholders' equity:
Preferred stock, 5,000,000 shares authorized at both March 31, 2018 and December 31, 2017; no shares were issued and outstanding at March 31, 2018 and December 31, 2017	0.0	0.0
Common stock, par value $0.01, 90,000,000 shares authorized at both March 31, 2018 and at December 31, 2017; 22,460,642 shares issued and 16,782,536 shares outstanding at March 31, 2018; 22,393,537 shares issued and 16,773,586 shares outstanding at December 31, 2017	0.2	0.2
Additional paid in capital	1,051.8	1,055.9
Retained earnings	111.7	85.5
Treasury stock, at cost, 5,678,106 shares at March 31, 2018 and 5,619,951 shares at December 31, 2017, respectively	(364.7)	(358.6)
Accumulated other comprehensive loss	(45.4)	(36.7)
Total stockholders' equity	753.6	746.3
Total	$ 1,405.4	$ 1,385.2