CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jul. 01, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 182.8	$ 130.5
Restricted cash	0.3	0.4
Accounts receivable, net	66.2	74.2
Unbilled receivables, net	160.6	138.1
Inventoried costs	49.0	49.0
Prepaid expenses	8.4	11.1
Other current assets	10.1	9.5
Current assets of discontinued operations	7.4	58.6
Total current assets	484.8	471.4
Property, plant and equipment, net	62.1	58.0
Goodwill	425.7	425.7
Intangible assets, net	18.8	22.0
Other assets	7.2	8.1
Non-current assets of discontinued operations	0.0	38.8
Total assets	998.6	1,024.0
Current liabilities:
Accounts payable	39.8	34.7
Accrued expenses	38.4	40.9
Accrued compensation	34.1	30.2
Accrued interest	1.7	1.7
Billings in excess of costs and earnings on uncompleted contracts	32.9	42.8
Other current liabilities	13.0	9.4
Current liabilities of discontinued operations	8.1	29.2
Total current liabilities	168.0	188.9
Long-term debt principal, net of current portion	293.8	293.5
Other long-term liabilities	24.0	24.1
Non-current liabilities of discontinued operations	6.3	6.0
Total liabilities	492.1	512.5
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at July 1, 2018 and December 31, 2017	0.0	0.0
Common stock, $0.001 par value, 195,000,000 shares authorized; 103,524,353 and 103,297,525 shares issued and outstanding at July 1, 2018 and December 31, 2017, respectively	0.0	0.0
Additional paid-in capital	1,238.8	1,233.7
Accumulated other comprehensive loss	(1.4)	(1.4)
Accumulated deficit	(730.9)	(720.8)
Total stockholders’ equity	506.5	511.5
Total liabilities and stockholders’ equity	$ 998.6	$ 1,024.0