Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 115.5	$ 102.1
Product sales	137.3	107.4
Total revenues	252.8	209.5
Cost of service revenues	88.2	79.8
Cost of product sales	98.9	71.9
Total costs	187.1	151.7
Gross profit	65.7	57.8
Selling, general and administrative expenses	49.3	45.1
Research and development expenses	4.9	3.6
Operating income from continuing operations	11.5	9.1
Other income (expense):
Interest expense, net	(16.2)	(16.1)
Other income (expense), net	(0.7)	0.4
Total other expense, net	(16.9)	(15.7)
Loss from continuing operations before income taxes	(5.4)	(6.6)
Provision (benefit) for income taxes from continuing operations	2.8	(4.1)
Loss from continuing operations	(8.2)	(2.5)
Loss from discontinued operations	(2.1)	(0.5)
Equity in net income (loss) of subsidiaries	0	0
Net loss	(10.3)	(3.0)
Comprehensive income (loss)	(10.2)	(3.0)
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	2.6	2.2
Research and development expenses	0	0
Operating income from continuing operations	(2.6)	(2.2)
Other income (expense):
Interest expense, net	(16.1)	(16.0)
Other income (expense), net	0	0.3
Total other expense, net	(16.1)	(15.7)
Loss from continuing operations before income taxes	(18.7)	(17.9)
Provision (benefit) for income taxes from continuing operations	0.3	0
Loss from continuing operations	(19.0)	(17.9)
Loss from discontinued operations	0	0
Equity in net income (loss) of subsidiaries	8.7	14.9
Net loss	(10.3)	(3.0)
Comprehensive income (loss)	(10.2)	(3.0)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	115.5	101.5
Product sales	123.3	96.0
Total revenues	238.8	197.5
Cost of service revenues	88.2	79.5
Cost of product sales	90.7	65.3
Total costs	178.9	144.8
Gross profit	59.9	52.7
Selling, general and administrative expenses	43.8	39.3
Research and development expenses	4.5	3.3
Operating income from continuing operations	11.6	10.1
Other income (expense):
Interest expense, net	0	0
Other income (expense), net	0	(0.1)
Total other expense, net	0	(0.1)
Loss from continuing operations before income taxes	11.6	10.0
Provision (benefit) for income taxes from continuing operations	2.4	(3.4)
Loss from continuing operations	9.2	13.4
Loss from discontinued operations	(1.8)	(0.6)
Equity in net income (loss) of subsidiaries	1.3	2.1
Net loss	8.7	14.9
Comprehensive income (loss)	8.7	14.9
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0.6
Product sales	18.8	14.3
Total revenues	18.8	14.9
Cost of service revenues	0	0.3
Cost of product sales	13.0	9.5
Total costs	13.0	9.8
Gross profit	5.8	5.1
Selling, general and administrative expenses	2.9	3.6
Research and development expenses	0.4	0.3
Operating income from continuing operations	2.5	1.2
Other income (expense):
Interest expense, net	(0.1)	(0.1)
Other income (expense), net	(0.7)	0.2
Total other expense, net	(0.8)	0.1
Loss from continuing operations before income taxes	1.7	1.3
Provision (benefit) for income taxes from continuing operations	0.1	(0.7)
Loss from continuing operations	1.6	2.0
Loss from discontinued operations	(0.3)	0.1
Equity in net income (loss) of subsidiaries	0	0
Net loss	1.3	2.1
Comprehensive income (loss)	1.2	2.1
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0
Product sales	(4.8)	(2.9)
Total revenues	(4.8)	(2.9)
Cost of service revenues	0	0
Cost of product sales	(4.8)	(2.9)
Total costs	(4.8)	(2.9)
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 (benefit) for income taxes from continuing operations	0	0
Loss from continuing operations	0	0
Loss from discontinued operations	0	0
Equity in net income (loss) of subsidiaries	(10.0)	(17.0)
Net loss	(10.0)	(17.0)
Comprehensive income (loss)	$ (9.9)	$ (17.0)