CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 01, 2018	Mar. 26, 2017
Income Statement [Abstract]
Service revenues	$ 46.0	$ 49.2
Product sales	97.0	82.8
Total revenues	143.0	132.0
Cost of service revenues	32.9	35.0
Cost of product sales	69.3	60.9
Total costs	102.2	95.9
Gross profit	40.8	36.1
Selling, general and administrative expenses	29.8	30.0
Research and development expenses	3.6	4.4
Unused office space, restructuring expenses, and other	0.4	0.3
Operating income from continuing operations	7.0	1.4
Other income (expense):
Interest expense, net	(5.1)	(8.2)
Loss on extinguishment of debt	0.0	(2.1)
Other income, net	0.3	0.2
Total other expense, net	(4.8)	(10.1)
Income (loss) from continuing operations before income taxes	2.2	(8.7)
Provision for income taxes from continuing operations	0.9	1.4
Income (loss) from continuing operations	1.3	(10.1)
Discontinued operations
Income (loss) from operations of discontinued component	(3.9)	0.3
Income tax benefit (expense)	0.4	(0.2)
Income (loss) from discontinued operations	(3.5)	0.1
Net loss	$ (2.2)	$ (10.0)
Basic income (loss) per common share:
Net income (loss) from continuing operations (in dollars per share)	$ 0.01	$ (0.13)
Net loss from discontinued operations (in dollars per share)	(0.03)	0.00
Net loss per common share (in dollars per share)	(0.02)	(0.13)
Diluted income (loss) per common share:
Net income (loss) from continuing operations (in dollars per share)	0.01	(0.13)
Net loss from discontinued operations (in dollars per share)	(0.03)	0.00
Net loss per common share (in dollars per share)	$ (0.02)	$ (0.13)
Weighted average common shares outstanding:
Basic (shares)	103.7	77.3
Diluted (shares)	105.7	77.3
Comprehensive Loss
Net loss	$ (2.2)	$ (10.0)
Change in cumulative translation adjustment	(0.1)	0.1
Comprehensive loss	$ (2.3)	$ (9.9)