Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 108.8	$ 125.6	$ 335.0	$ 339.8
Product sales	117.6	150.7	379.9	365.8
Total revenues	226.4	276.3	714.9	705.6
Cost of service revenues	82.4	98.3	254.3	264.8
Cost of product sales	91.7	103.9	282.1	251.6
Total costs	174.1	202.2	536.4	516.4
Gross profit	52.3	74.1	178.5	189.2
Selling, general and administrative expenses	41.4	55.5	137.6	145.7
Research and development expenses	4.8	4.5	14.5	12.9
Operating income from continuing operations	6.1	14.1	26.4	30.6
Other income (expense):
Interest expense, net	16.2	17.6	48.7	49.9
Other income (expense), net	(0.8)	(0.4)	(0.2)	(1.3)
Total other expense, net	15.4	17.2	48.5	48.6
Loss from continuing operations before income taxes	(9.3)	(3.1)	(22.1)	(18.0)
Provision (benefit) for income taxes from continuing operations	0.2	1.3	2.9	3.8
Loss from continuing operations	(9.5)	(4.4)	(25.0)	(21.8)
Income (loss) from discontinued operations	(0.4)	0.2	(4.8)	(2.6)
Equity in net income (loss) of subsidiaries	0	0	0	0
Net loss	(9.9)	(4.2)	(29.8)	(24.4)
Comprehensive income (loss)	(10.0)	(4.4)	(29.8)	(24.8)
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	1.4	4.5	5.1	9.3
Research and development expenses	0	0	0	0
Operating income from continuing operations	(1.4)	(4.5)	(5.1)	(9.3)
Other income (expense):
Interest expense, net	16.2	17.6	48.4	49.7
Other income (expense), net	0	0	0	(0.3)
Total other expense, net	16.2	17.6	48.4	49.4
Loss from continuing operations before income taxes	(17.6)	(22.1)	(53.5)	(58.7)
Provision (benefit) for income taxes from continuing operations	0	0	0.5	0
Loss from continuing operations	(17.6)	(22.1)	(54.0)	(58.7)
Income (loss) from discontinued operations	0	0	0.1	0
Equity in net income (loss) of subsidiaries	7.7	17.9	24.1	34.3
Net loss	(9.9)	(4.2)	(29.8)	(24.4)
Comprehensive income (loss)	(10.0)	(4.4)	(29.8)	(24.8)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	107.6	124.9	332.4	337.9
Product sales	103.9	136.8	338.1	329.4
Total revenues	211.5	261.7	670.5	667.3
Cost of service revenues	81.7	97.8	252.5	263.5
Cost of product sales	82.2	96.1	255.7	231.0
Total costs	163.9	193.9	508.2	494.5
Gross profit	47.6	67.8	162.3	172.8
Selling, general and administrative expenses	36.2	47.2	122.4	126.1
Research and development expenses	4.7	4.3	13.7	12.2
Operating income from continuing operations	6.7	16.3	26.2	34.5
Other income (expense):
Interest expense, net	(0.1)	(0.1)	(0.1)	(0.2)
Other income (expense), net	(0.2)	0.1	(0.3)	0
Total other expense, net	(0.3)	0	(0.4)	(0.2)
Loss from continuing operations before income taxes	7.0	16.3	26.6	34.7
Provision (benefit) for income taxes from continuing operations	(0.1)	0.9	1.9	3.1
Loss from continuing operations	7.1	15.4	24.7	31.6
Income (loss) from discontinued operations	(0.4)	(0.5)	(4.9)	(3.3)
Equity in net income (loss) of subsidiaries	1.0	3.0	4.3	6.0
Net loss	7.7	17.9	24.1	34.3
Comprehensive income (loss)	7.7	17.9	24.1	34.3
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	1.2	0.7	2.6	1.9
Product sales	17.5	17.0	55.1	46.0
Total revenues	18.7	17.7	57.7	47.9
Cost of service revenues	0.7	0.5	1.8	1.3
Cost of product sales	13.3	10.9	39.7	30.2
Total costs	14.0	11.4	41.5	31.5
Gross profit	4.7	6.3	16.2	16.4
Selling, general and administrative expenses	3.8	3.8	10.1	10.3
Research and development expenses	0.1	0.2	0.8	0.7
Operating income from continuing operations	0.8	2.3	5.3	5.4
Other income (expense):
Interest expense, net	0.1	0.1	0.4	0.4
Other income (expense), net	(0.6)	(0.5)	0.1	(1.0)
Total other expense, net	(0.5)	(0.4)	0.5	(0.6)
Loss from continuing operations before income taxes	1.3	2.7	4.8	6.0
Provision (benefit) for income taxes from continuing operations	0.3	0.4	0.5	0.7
Loss from continuing operations	1.0	2.3	4.3	5.3
Income (loss) from discontinued operations	0	0.7	0	0.7
Equity in net income (loss) of subsidiaries	0	0	0	0
Net loss	1.0	3.0	4.3	6.0
Comprehensive income (loss)	0.9	2.8	4.3	5.6
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0	0	0
Product sales	(3.8)	(3.1)	(13.3)	(9.6)
Total revenues	(3.8)	(3.1)	(13.3)	(9.6)
Cost of service revenues	0	0	0	0
Cost of product sales	(3.8)	(3.1)	(13.3)	(9.6)
Total costs	(3.8)	(3.1)	(13.3)	(9.6)
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
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
Income (loss) from discontinued operations	0	0	0	0
Equity in net income (loss) of subsidiaries	(8.7)	(20.9)	(28.4)	(40.3)
Net loss	(8.7)	(20.9)	(28.4)	(40.3)
Comprehensive income (loss)	$ (8.6)	$ (20.7)	$ (28.4)	$ (39.9)