CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Operating activities:
Net income (loss)	$ (8.2)	$ (20.5)
Loss (income) from discontinued operations	7.1	(2.4)
Loss from continuing operations	(1.1)	(22.9)
Adjustments to reconcile loss from continuing operations to net cash provided by (used in) operating activities from continuing operations:
Depreciation and amortization	13.6	16.8
Stock-based compensation	5.1	6.8
Deferred income taxes	0.5	1.8
Amortization of deferred financing costs	0.7	1.0
Amortization of discount on Senior Secured Notes	0.0	0.6
Loss on extinguishment of debt	0.0	2.1
Provision for doubtful accounts	0.4	0.1
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	13.8	10.4
Unbilled receivables	(29.2)	(24.8)
Inventoried costs	0.9	(4.7)
Prepaid expenses and other assets	(4.2)	(5.3)
Accounts payable	8.2	(4.0)
Accrued expenses	(1.0)	(7.8)
Accrued compensation	2.0	(4.2)
Advance payments received on contracts	(0.6)	(0.6)
Accrued interest	4.8	6.5
Billings in excess of costs and earnings on uncompleted contracts	(1.3)	10.7
Income tax receivable and payable	(0.8)	1.3
Other liabilities	3.6	(0.7)
Net cash provided by (used in) operating activities from continuing operations	15.4	(16.9)
Investing activities:
Cash paid for acquisitions, net of cash acquired	(2.9)	0.2
Capital expenditures	(17.9)	(18.7)
Proceeds from sale of assets	67.0	0.7
Net cash provided by (used in) investing activities from continuing operations	46.2	(17.8)
Financing activities:
Extinguishment of long-term debt	0.0	(64.0)
Debt issuance costs	(0.1)	0.0
Proceeds from the issuance of common stock	(1.1)	268.0
Repayment of debt	(0.8)	(0.8)
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	3.7	1.5
Net cash provided by financing activities from continuing operations	1.7	204.7
Net cash flows of continuing operations	63.3	170.0
Net operating cash flows of discontinued operations	(6.4)	(0.5)
Net investing cash flows of discontinued operations	0.0	(0.6)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(0.3)	0.5
Net increase in cash, cash equivalents and restricted cash	56.6	169.4
Cash, cash equivalents and restricted cash at beginning of period	130.9	70.7
Cash, cash equivalents and restricted cash at end of period	$ 187.5	$ 240.1