CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Income Statement [Abstract]
Service revenues	$ 91.6	$ 88.2	$ 176.6	$ 170.8
Product sales	94.1	80.0	176.9	150.4
Total revenues	185.7	168.2	353.5	321.2
Cost of service revenues	67.0	64.4	128.8	124.7
Cost of product sales	71.3	58.6	132.2	115.4
Total costs	138.3	123.0	261.0	240.1
Gross profit	47.4	45.2	92.5	81.1
Selling, general and administrative expenses	40.6	36.4	79.3	74.1
Research and development expenses	4.1	4.0	8.5	6.9
Unused office space, restructuring expenses, and other	0.1	4.8	0.4	10.3
Operating income (loss) from continuing operations	2.6	0.0	4.3	(10.2)
Other income (expense):
Interest expense, net	(7.2)	(8.7)	(15.4)	(17.4)
Loss on extinguishment of debt	0.0	0.0	(2.1)	0.0
Other income, net	0.2	0.2	0.4	0.5
Total other expense, net	(7.0)	(8.5)	(17.1)	(16.9)
Loss from continuing operations before income taxes	(4.4)	(8.5)	(12.8)	(27.1)
Provision for income taxes from continuing operations	1.8	1.8	3.3	5.4
Loss from continuing operations	(6.2)	(10.3)	(16.1)	(32.5)
Discontinued operations
Loss from operations of discontinued component	0.0	(0.1)	(0.1)	(0.1)
Income tax benefit	0.0	0.0	0.0	0.0
Loss from discontinued operations	0.0	(0.1)	(0.1)	(0.1)
Net loss	$ (6.2)	$ (10.4)	$ (16.2)	$ (32.6)
Basic and diluted loss per common share:
Loss from continuing operations (in dollars per share)	$ (0.07)	$ (0.17)	$ (0.20)	$ (0.54)
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.01)
Net loss per common share (in dollars per share)	$ (0.07)	$ (0.17)	$ (0.20)	$ (0.55)
Weighted average common shares outstanding:
Basic and diluted weighted average common shares outstanding (in shares)	86.6	59.8	82.0	59.7
Comprehensive Loss
Net loss	$ (6.2)	$ (10.4)	$ (16.2)	$ (32.6)
Change in cumulative translation adjustment	0.0	(0.1)	0.1	(0.1)
Comprehensive loss	$ (6.2)	$ (10.5)	$ (16.1)	$ (32.7)