Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 125.6	$ 93.2	$ 339.8	$ 248.3
Product sales	150.7	113.4	365.8	252.2
Total revenues	276.3	206.6	705.6	500.5
Cost of service revenues	98.3	68.6	264.8	186.9
Cost of product sales	103.9	79.0	251.6	181.8
Total costs	202.2	147.6	516.4	368.7
Gross profit	74.1	59.0	189.2	131.8
Selling, general and administrative expenses	55.5	46.1	145.7	107.0
Research and development expenses	4.5	3.2	12.9	5.0
Operating income from continuing operations	14.1	9.7	30.6	19.8
Other income (expense):
Interest expense, net	17.6	15.0	49.9	34.8
Other income, net	(0.4)	0.3	(1.3)	0
Total other income and expense, net	17.2	15.3	48.6	34.8
Income (loss) from continuing operations before income taxes	(3.1)	(5.6)	(18.0)	(15.0)
Provision for income taxes from continuing operations	1.3	1.6	3.8	1.3
Income (loss) from continuing operations	(4.4)	(7.2)	(21.8)	(16.3)
Income (loss) from discontinued operations	0.2	0.3	(2.6)	0.7
Equity in net income (loss) of subsidiaries	0	0	0	0
Net income (loss)	(4.2)	(6.9)	(24.4)	(15.6)
Comprehensive income (loss)	(4.0)	(6.8)	(24.0)	(15.5)
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	4.5	4.7	9.3	14.4
Research and development expenses	0	0	0	0
Operating income from continuing operations	(4.5)	(4.7)	(9.3)	(14.4)
Other income (expense):
Interest expense, net	17.6	15.0	49.7	34.6
Other income, net	0	0	(0.3)	(0.3)
Total other income and expense, net	17.6	15.0	49.4	34.3
Income (loss) from continuing operations before income taxes	(22.1)	(19.7)	(58.7)	(48.7)
Provision for income taxes from continuing operations	0	0	0	0
Income (loss) from continuing operations	(22.1)	(19.7)	(58.7)	(48.7)
Income (loss) from discontinued operations	0	0	0	0
Equity in net income (loss) of subsidiaries	17.9	12.8	34.3	33.1
Net income (loss)	(4.2)	(6.9)	(24.4)	(15.6)
Comprehensive income (loss)	(4.2)	(6.9)	(24.4)	(15.6)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	124.9	92.4	337.9	247.5
Product sales	136.8	101.4	329.4	228.4
Total revenues	261.7	193.8	667.3	475.9
Cost of service revenues	97.8	68.0	263.5	186.3
Cost of product sales	96.1	72.4	231.0	169.1
Total costs	193.9	140.4	494.5	355.4
Gross profit	67.8	53.4	172.8	120.5
Selling, general and administrative expenses	47.2	36.7	126.1	83.2
Research and development expenses	4.3	3.0	12.2	4.6
Operating income from continuing operations	16.3	13.7	34.5	32.7
Other income (expense):
Interest expense, net	(0.1)	(0.3)	(0.2)	(0.2)
Other income, net	0.1	(0.1)	0	(0.2)
Total other income and expense, net	0	(0.4)	(0.2)	(0.4)
Income (loss) from continuing operations before income taxes	16.3	14.1	34.7	33.1
Provision for income taxes from continuing operations	0.9	1.3	3.1	0.9
Income (loss) from continuing operations	15.4	12.8	31.6	32.2
Income (loss) from discontinued operations	(0.5)	0.3	(3.3)	0.4
Equity in net income (loss) of subsidiaries	3.0	(0.3)	6.0	0.5
Net income (loss)	17.9	12.8	34.3	33.1
Comprehensive income (loss)	17.9	12.8	34.3	33.1
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	0.7	0.8	1.9	0.8
Product sales	17.0	15.7	46.0	31.2
Total revenues	17.7	16.5	47.9	32.0
Cost of service revenues	0.5	0.6	1.3	0.6
Cost of product sales	10.9	10.3	30.2	20.1
Total costs	11.4	10.9	31.5	20.7
Gross profit	6.3	5.6	16.4	11.3
Selling, general and administrative expenses	3.8	4.7	10.3	9.4
Research and development expenses	0.2	0.2	0.7	0.4
Operating income from continuing operations	2.3	0.7	5.4	1.5
Other income (expense):
Interest expense, net	0.1	0.3	0.4	0.4
Other income, net	(0.5)	0.4	(1.0)	0.5
Total other income and expense, net	(0.4)	0.7	(0.6)	0.9
Income (loss) from continuing operations before income taxes	2.7	0	6.0	0.6
Provision for income taxes from continuing operations	0.4	0.3	0.7	0.4
Income (loss) from continuing operations	2.3	(0.3)	5.3	0.2
Income (loss) from discontinued operations	0.7	0	0.7	0.3
Equity in net income (loss) of subsidiaries	0	0	0	0
Net income (loss)	3.0	(0.3)	6.0	0.5
Comprehensive income (loss)	3.2	(0.2)	6.4	0.6
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0	0	0
Product sales	(3.1)	(3.7)	(9.6)	(7.4)
Total revenues	(3.1)	(3.7)	(9.6)	(7.4)
Cost of service revenues	0	0	0	0
Cost of product sales	(3.1)	(3.7)	(9.6)	(7.4)
Total costs	(3.1)	(3.7)	(9.6)	(7.4)
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, net	0	0	0	0
Total other income and expense, net	0	0	0	0
Income (loss) from continuing operations before income taxes	0	0	0	0
Provision for income taxes from continuing operations	0	0		0
Income (loss) from continuing operations	0	0	0	0
Income (loss) from discontinued operations	0	0	0	0
Equity in net income (loss) of subsidiaries	(20.9)	(12.5)	(40.3)	(33.6)
Net income (loss)	(20.9)	(12.5)	(40.3)	(33.6)
Comprehensive income (loss)	$ (20.9)	$ (12.5)	$ (40.3)	$ (33.6)