CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
Operating activities:
Net income	$ 0.9	$ 1.4
Loss from discontinued operations	(1.1)	(0.8)
Income from continuing operations	2.0	2.2
Adjustments to reconcile income from continuing operations to net cash provided by operating activities from continuing operations:
Depreciation and amortization	19.4	18.5
Deferred income taxes	(0.7)	(0.3)
Amortization of lease right-of-use assets	6.7	7.3
Stock-based compensation	19.2	14.5
Amortization of deferred financing costs	0.7	0.7
Provision for (recovery of) doubtful accounts	(0.2)	0.2
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	10.1	6.4
Unbilled receivables	(12.2)	(12.3)
Inventoried costs	(6.8)	(4.8)
Prepaid expenses and other assets	(5.1)	(15.8)
Operating lease liabilities	(6.7)	(8.0)
Accounts payable	(10.5)	(1.7)
Accrued expenses	(6.0)	(4.9)
Accrued compensation	3.3	6.5
Accrued interest	4.8	4.8
Billings in excess of costs and earnings on uncompleted contracts	23.8	(2.7)
Income tax receivable and payable	(2.5)	(1.4)
Other liabilities	(4.7)	9.9
Net cash provided by operating activities from continuing operations	34.6	19.1
Investing activities:
Cash paid for acquisitions, net of cash acquired	(6.2)	(43.9)
Proceeds from insurance	4.5	0.0
Proceeds from sale of assets	0.0	0.1
Capital expenditures	(33.4)	(23.0)
Net cash used in investing activities from continuing operations	(35.1)	(66.8)
Financing activities:
Proceeds from the issuance of long-term debt	0.0	4.8
Proceeds from the issuance of common stock, net of issuance costs	0.0	240.4
Repayment of debt	(5.1)	(0.7)
Payments under finance leases	(0.7)	(0.5)
Payments of employee taxes withheld from share-based awards	(9.1)	(1.3)
Proceeds from shares issued under equity plans	5.9	5.3
Net cash provided by (used in) financing activities from continuing operations	(9.0)	248.0
Net cash flows of continuing operations	(9.5)	200.3
Net operating cash flows of discontinued operations	(1.1)	2.1
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1.0)	0.4
Net increase (decrease) in cash, cash equivalents and restricted cash	(11.6)	202.8
Cash, cash equivalents and restricted cash at beginning of period	381.5	172.6
Cash, cash equivalents and restricted cash at end of period	$ 369.9	$ 375.4