CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 187.2	$ 130.5
Restricted cash	0.3	0.4
Accounts receivable, net	60.1	74.2
Unbilled receivables, net	166.1	138.1
Inventoried costs	48.6	49.0
Prepaid expenses	14.2	11.1
Other current assets	11.9	9.5
Current assets of discontinued operations	8.2	58.6
Total current assets	496.6	471.4
Property, plant and equipment, net	65.2	58.0
Goodwill	425.7	425.7
Intangible assets, net	17.5	22.0
Other assets	6.9	8.1
Non-current assets of discontinued operations	0.0	38.8
Total assets	1,011.9	1,024.0
Current liabilities:
Accounts payable	41.8	34.7
Accrued expenses	38.7	40.9
Accrued compensation	32.2	30.2
Accrued interest	6.5	1.7
Billings in excess of costs and earnings on uncompleted contracts	40.5	42.8
Other current liabilities	5.4	9.4
Current liabilities of discontinued operations	7.0	29.2
Total current liabilities	172.1	188.9
Long-term debt principal, net of current portion	294.0	293.5
Other long-term liabilities	27.6	24.1
Non-current liabilities of discontinued operations	6.3	6.0
Total liabilities	500.0	512.5
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at September 30, 2018 and December 31, 2017	0.0	0.0
Common stock, $0.001 par value, 195,000,000 shares authorized; 103,752,514 and 103,297,525 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	0.0	0.0
Additional paid-in capital	1,242.4	1,233.7
Accumulated other comprehensive loss	(1.3)	(1.4)
Accumulated deficit	(729.2)	(720.8)
Total stockholders’ equity	511.9	511.5
Total liabilities and stockholders’ equity	$ 1,011.9	$ 1,024.0