CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Income Statement [Abstract]
Service revenues	$ 88.2	$ 88.8	$ 170.8	$ 176.1
Product sales	80.0	71.7	150.4	141.3
Total revenues	168.2	160.5	321.2	317.4
Cost of service revenues	64.4	67.1	124.7	133.1
Cost of product sales	58.6	52.5	115.4	105.1
Total costs	123.0	119.6	240.1	238.2
Gross profit	45.2	40.9	81.1	79.2
Selling, general and administrative expenses	36.4	40.3	74.1	77.7
Research and development expenses	4.0	4.3	6.9	8.2
Unused office space, restructuring expenses, and other	4.8	0.0	10.3	0.9
Operating loss from continuing operations	0.0	(3.7)	(10.2)	(7.6)
Other income (expense):
Interest expense, net	(8.7)	(8.9)	(17.4)	(17.7)
Other income (expense), net	0.2	(1.0)	0.5	(0.9)
Total other expense, net	(8.5)	(9.9)	(16.9)	(18.6)
Loss from continuing operations before income taxes	(8.5)	(13.6)	(27.1)	(26.2)
Provision for income taxes from continuing operations	1.8	2.3	5.4	4.2
Loss from continuing operations	(10.3)	(15.9)	(32.5)	(30.4)
Discontinued operations
Loss from operations of discontinued component	(0.1)	(0.7)	(0.1)	(2.1)
Income tax benefit	0.0	1.6	0.0	1.2
Income (loss) from discontinued operations	(0.1)	0.9	(0.1)	(0.9)
Net loss	$ (10.4)	$ (15.0)	$ (32.6)	$ (31.3)
Basic and diluted loss per common share:
Loss from continuing operations (in dollars per share)	$ (0.17)	$ (0.27)	$ (0.54)	$ (0.52)
Income (loss) from discontinued operations (in dollars per share)	0.00	0.02	(0.01)	(0.02)
Net loss per common share (in dollars per share)	$ (0.17)	$ (0.25)	$ (0.55)	$ (0.54)
Weighted average common shares outstanding:
Basic and diluted weighted average common shares outstanding (in shares)	59.8	58.4	59.7	58.3
Comprehensive Loss
Net loss	$ (10.4)	$ (15.0)	$ (32.6)	$ (31.3)
Change in cumulative translation adjustment	(0.1)	0.3	(0.1)	0.1
Comprehensive loss	$ (10.5)	$ (14.7)	$ (32.7)	$ (31.2)