Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 97.1	$ 108.8	$ 299.5	$ 335.0
Product sales	120.0	117.6	347.0	379.9
Total revenues	217.1	226.4	646.5	714.9
Cost of service revenues	77.7	82.4	229.7	254.3
Cost of product sales	86.4	91.7	254.8	282.1
Total costs	164.1	174.1	484.5	536.4
Gross profit	53.0	52.3	162.0	178.5
Selling, general and administrative expenses	45.9	41.4	135.8	137.6
Research and development expenses	5.9	4.8	17.0	14.5
Operating income from continuing operations	1.2	6.1	9.2	26.4
Other income (expense):
Interest expense, net	(12.1)	(16.2)	(42.2)	(48.7)
Loss on extinguishment of debt	0	0	(39.1)	0
Other income (expense), net	(0.4)	0.8	0	0.2
Total other expense, net	(12.5)	(15.4)	(81.3)	(48.5)
Loss from continuing operations before income taxes	(11.3)	(9.3)	(72.1)	(22.1)
Provision (benefit) for income taxes from continuing operations	(0.2)	0.2	3.7	2.9
Loss from continuing operations	(11.1)	(9.5)	(75.8)	(25.0)
Loss from discontinued operations	0.2	(0.4)	0	(4.8)
Equity in net income (loss) of subsidiaries	0	0	0	0
Net loss	(10.9)	(9.9)	(75.8)	(29.8)
Comprehensive income (loss)	(11.0)	(10.0)	(76.0)	(29.8)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0	0	0
Product sales	0	0	0	0
Total revenues	0	0	0	0
Cost of service revenues	0	0	0	0
Cost of product sales	0	0	0	0
Total costs	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	2.9	1.4	11.9	5.1
Research and development expenses	0	0	0	0
Operating income from continuing operations	(2.9)	(1.4)	(11.9)	(5.1)
Other income (expense):
Interest expense, net	(12.2)	(16.2)	(42.1)	(48.4)
Loss on extinguishment of debt	0		(39.1)
Other income (expense), net	0	0	0	0
Total other expense, net	(12.2)	(16.2)	(81.2)	(48.4)
Loss from continuing operations before income taxes	(15.1)	(17.6)	(93.1)	(53.5)
Provision (benefit) for income taxes from continuing operations	0.4	0	0.9	0.5
Loss from continuing operations	(15.5)	(17.6)	(94.0)	(54.0)
Loss from discontinued operations	0.2	0	0.2	0.1
Equity in net income (loss) of subsidiaries	4.4	7.7	18.0	24.1
Net loss	(10.9)	(9.9)	(75.8)	(29.8)
Comprehensive income (loss)	(11.0)	(10.0)	(76.0)	(29.8)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	94.1	107.6	292.3	332.4
Product sales	103.4	103.9	304.4	338.1
Total revenues	197.5	211.5	596.7	670.5
Cost of service revenues	75.4	81.7	224.1	252.5
Cost of product sales	76.9	82.2	228.4	255.7
Total costs	152.3	163.9	452.5	508.2
Gross profit	45.2	47.6	144.2	162.3
Selling, general and administrative expenses	39.5	36.2	113.8	122.4
Research and development expenses	5.5	4.7	15.8	13.7
Operating income from continuing operations	0.2	6.7	14.6	26.2
Other income (expense):
Interest expense, net	0	0.1	0.1	0.1
Loss on extinguishment of debt	0		0
Other income (expense), net	0.1	0.2	0.1	0.3
Total other expense, net	0.1	0.3	0.2	0.4
Loss from continuing operations before income taxes	0.3	7.0	14.8	26.6
Provision (benefit) for income taxes from continuing operations	(1.2)	(0.1)	1.8	1.9
Loss from continuing operations	1.5	7.1	13.0	24.7
Loss from discontinued operations	0	(0.4)	(0.2)	(4.9)
Equity in net income (loss) of subsidiaries	2.9	1.0	5.2	4.3
Net loss	4.4	7.7	18.0	24.1
Comprehensive income (loss)	4.4	7.7	18.0	24.1
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	3.0	1.2	7.2	2.6
Product sales	18.6	17.5	50.3	55.1
Total revenues	21.6	18.7	57.5	57.7
Cost of service revenues	2.3	0.7	5.6	1.8
Cost of product sales	11.5	13.3	34.1	39.7
Total costs	13.8	14.0	39.7	41.5
Gross profit	7.8	4.7	17.8	16.2
Selling, general and administrative expenses	3.5	3.8	10.1	10.1
Research and development expenses	0.4	0.1	1.2	0.8
Operating income from continuing operations	3.9	0.8	6.5	5.3
Other income (expense):
Interest expense, net	0.1	(0.1)	(0.2)	(0.4)
Loss on extinguishment of debt	0		0
Other income (expense), net	(0.5)	0.6	(0.1)	(0.1)
Total other expense, net	(0.4)	0.5	(0.3)	(0.5)
Loss from continuing operations before income taxes	3.5	1.3	6.2	4.8
Provision (benefit) for income taxes from continuing operations	0.6	0.3	1.0	0.5
Loss from continuing operations	2.9	1.0	5.2	4.3
Loss from discontinued operations	0	0	0	0
Equity in net income (loss) of subsidiaries	0	0	0	0
Net loss	2.9	1.0	5.2	4.3
Comprehensive income (loss)	2.8	0.9	5.0	4.3
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0	0	0
Product sales	(2.0)	(3.8)	(7.7)	(13.3)
Total revenues	(2.0)	(3.8)	(7.7)	(13.3)
Cost of service revenues	0	0	0	0
Cost of product sales	(2.0)	(3.8)	(7.7)	(13.3)
Total costs	(2.0)	(3.8)	(7.7)	(13.3)
Gross profit	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Research and development expenses	0	0	0	0
Operating income from continuing operations	0	0	0	0
Other income (expense):
Interest expense, net	0	0	0	0
Loss on extinguishment of debt	0		0
Other income (expense), net	0	0	0	0
Total other expense, net	0	0	0	0
Loss from continuing operations before income taxes	0	0	0	0
Provision (benefit) for income taxes from continuing operations	0	0	0	0
Loss from continuing operations	0	0	0	0
Loss from discontinued operations	0	0	0	0
Equity in net income (loss) of subsidiaries	(7.3)	(8.7)	(23.2)	(28.4)
Net loss	(7.3)	(8.7)	(23.2)	(28.4)
Comprehensive income (loss)	$ (7.2)	$ (8.6)	$ (23.0)	$ (28.4)