Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 100.6	$ 115.5
Product sales	99.5	137.3
Total revenues	200.1	252.8
Cost of service revenues	74.1	88.2
Cost of product sales	73.4	98.9
Total costs	147.5	187.1
Gross profit	52.6	65.7
Selling, general and administrative expenses	44.1	49.3
Research and development expenses	5.2	4.9
Operating income from continuing operations	3.3	11.5
Other income (expense):
Interest expense, net	(16.1)	(16.2)
Other income (expense), net	0.2	(0.7)
Total other expense, net	(15.9)	(16.9)
Loss from continuing operations before income taxes	(12.6)	(5.4)
Provision for income taxes from continuing operations	2.3	2.8
Loss from continuing operations	(14.9)	(8.2)
Income (loss) from discontinued operations	(0.1)	(2.1)
Equity in net income (loss) of subsidiaries	0	0
Net loss	(15.0)	(10.3)
Comprehensive income (loss)	(15.1)	(10.2)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0
Product sales	0	0
Total revenues	0	0
Cost of service revenues	0	0
Cost of product sales	0	0
Total costs	0	0
Gross profit	0	0
Selling, general and administrative expenses	5.0	2.6
Research and development expenses	0	0
Operating income from continuing operations	(5.0)	(2.6)
Other income (expense):
Interest expense, net	(16.0)	(16.1)
Other income (expense), net	(0.1)	0
Total other expense, net	(16.1)	(16.1)
Loss from continuing operations before income taxes	(21.1)	(18.7)
Provision for income taxes from continuing operations	0.3	0.3
Loss from continuing operations	(21.4)	(19.0)
Income (loss) from discontinued operations	0	0
Equity in net income (loss) of subsidiaries	6.4	8.7
Net loss	(15.0)	(10.3)
Comprehensive income (loss)	(15.1)	(10.2)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	98.3	115.5
Product sales	86.3	123.3
Total revenues	184.6	238.8
Cost of service revenues	72.4	88.2
Cost of product sales	64.9	90.7
Total costs	137.3	178.9
Gross profit	47.3	59.9
Selling, general and administrative expenses	35.8	43.8
Research and development expenses	4.7	4.5
Operating income from continuing operations	6.8	11.6
Other income (expense):
Interest expense, net	0	0
Other income (expense), net	0.1	0
Total other expense, net	0.1	0
Loss from continuing operations before income taxes	6.9	11.6
Provision for income taxes from continuing operations	1.9	2.4
Loss from continuing operations	5.0	9.2
Income (loss) from discontinued operations	(0.1)	(1.8)
Equity in net income (loss) of subsidiaries	1.5	1.3
Net loss	6.4	8.7
Comprehensive income (loss)	6.4	8.7
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	2.3	0
Product sales	16.6	18.8
Total revenues	18.9	18.8
Cost of service revenues	1.7	0
Cost of product sales	11.9	13.0
Total costs	13.6	13.0
Gross profit	5.3	5.8
Selling, general and administrative expenses	3.3	2.9
Research and development expenses	0.5	0.4
Operating income from continuing operations	1.5	2.5
Other income (expense):
Interest expense, net	(0.1)	(0.1)
Other income (expense), net	0.2	(0.7)
Total other expense, net	0.1	(0.8)
Loss from continuing operations before income taxes	1.6	1.7
Provision for income taxes from continuing operations	0.1	0.1
Loss from continuing operations	1.5	1.6
Income (loss) from discontinued operations	0	(0.3)
Equity in net income (loss) of subsidiaries	0	0
Net loss	1.5	1.3
Comprehensive income (loss)	1.4	1.2
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0
Product sales	(3.4)	(4.8)
Total revenues	(3.4)	(4.8)
Cost of service revenues	0	0
Cost of product sales	(3.4)	(4.8)
Total costs	(3.4)	(4.8)
Gross profit	0	0
Selling, general and administrative expenses	0	0
Research and development expenses	0	0
Operating income from continuing operations	0	0
Other income (expense):
Interest expense, net	0	0
Other income (expense), net	0	0
Total other expense, net	0	0
Loss from continuing operations before income taxes	0	0
Provision for income taxes from continuing operations	0	0
Loss from continuing operations	0	0
Income (loss) from discontinued operations	0	0
Equity in net income (loss) of subsidiaries	(7.9)	(10.0)
Net loss	(7.9)	(10.0)
Comprehensive income (loss)	$ (7.8)	$ (9.9)