Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 112.1	$ 75.3	$ 214.2	$ 155.1
Product sales	107.7	95.8	215.1	138.8
Total revenues	219.8	171.1	429.3	293.9
Cost of service revenue	86.7	58.0	166.5	118.3
Cost of product sales	75.4	67.7	147.7	102.8
Total costs	162.1	125.7	314.2	221.1
Gross profit	57.7	45.4	115.1	72.8
Selling, general and administrative expenses	45.5	35.5	90.2	60.9
Research and development expenses	4.8	1.2	8.4	1.8
Operating income from continuing operations	7.4	8.7	16.5	10.1
Other income (expense):
Interest expense, net	(16.2)	(13.1)	(32.3)	(19.8)
Other income, net	0.5	0	0.9	0.3
Total other income and expense, net	(15.7)	(13.1)	(31.4)	(19.5)
Income (loss) from continuing operations before income taxes	(8.3)	(4.4)	(14.9)	(9.4)
Provision for income taxes from continuing operations	(6.6)	(0.9)	(2.5)	0.3
Income (loss) from continuing operations	(14.9)	(5.3)	(17.4)	(9.1)
Income (loss) from discontinued operations	(2.3)	0.1	(2.8)	0.4
Equity in net income (loss) of subsidiaries	0	0	0	0
Net income (loss)	(17.2)	(5.2)	(20.2)	(8.7)
Comprehensive income (loss)	(17.4)	(5.2)	(20.4)	(8.7)
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 revenue	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	2.6	3.0	4.8	9.7
Research and development expenses	0	0	0	0
Operating income from continuing operations	(2.6)	(3.0)	(4.8)	(9.7)
Other income (expense):
Interest expense, net	(16.1)	(13.0)	(32.1)	(19.6)
Other income, net	0	0	0.3	0.3
Total other income and expense, net	(16.1)	(13.0)	(31.8)	(19.3)
Income (loss) from continuing operations before income taxes	(18.7)	(16.0)	(36.6)	(29.0)
Provision for income taxes from continuing operations	0	0	0	0
Income (loss) from continuing operations	(18.7)	(16.0)	(36.6)	(29.0)
Income (loss) from discontinued operations	0	0	0	0
Equity in net income (loss) of subsidiaries	1.5	10.8	16.4	20.3
Net income (loss)	(17.2)	(5.2)	(20.2)	(8.7)
Comprehensive income (loss)	(17.6)	(5.2)	(20.6)	(8.7)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	111.5	75.3	213.0	155.1
Product sales	96.6	84.0	192.6	127.0
Total revenues	208.1	159.3	405.6	282.1
Cost of service revenue	86.2	58.0	165.7	118.3
Cost of product sales	69.2	61.6	134.9	96.7
Total costs	155.4	119.6	300.6	215.0
Gross profit	52.7	39.7	105.0	67.1
Selling, general and administrative expenses	40.0	28.2	78.9	46.9
Research and development expenses	4.6	1.0	7.9	1.6
Operating income from continuing operations	8.1	10.5	18.2	18.6
Other income (expense):
Interest expense, net	0.1	0	0.1	(0.1)
Other income, net	0.2	0.1	0.1	0.1
Total other income and expense, net	0.3	0.1	0.2	0
Income (loss) from continuing operations before income taxes	8.4	10.6	18.4	18.6
Provision for income taxes from continuing operations	(5.7)	(0.8)	(2.3)	0.5
Income (loss) from continuing operations	2.7	9.8	16.1	19.1
Income (loss) from discontinued operations	(2.2)	0	(2.8)	0
Equity in net income (loss) of subsidiaries	1.0	1.0	3.0	1.1
Net income (loss)	1.5	10.8	16.3	20.2
Comprehensive income (loss)	1.7	10.6	16.3	20.2
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	0.6	0	1.2	0
Product sales	14.7	15.5	29.0	15.5
Total revenues	15.3	15.5	30.2	15.5
Cost of service revenue	0.5	0	0.8	0
Cost of product sales	9.8	9.8	19.3	9.8
Total costs	10.3	9.8	20.1	9.8
Gross profit	5.0	5.7	10.1	5.7
Selling, general and administrative expenses	2.9	4.3	6.5	4.3
Research and development expenses	0.2	0.2	0.5	0.2
Operating income from continuing operations	1.9	1.2	3.1	1.2
Other income (expense):
Interest expense, net	(0.2)	(0.1)	(0.3)	(0.1)
Other income, net	0.3	(0.1)	0.5	(0.1)
Total other income and expense, net	0.1	(0.2)	0.2	(0.2)
Income (loss) from continuing operations before income taxes	2.0	1.0	3.3	1.0
Provision for income taxes from continuing operations	(0.9)	(0.1)	(0.2)	(0.2)
Income (loss) from continuing operations	1.1	0.9	3.1	0.8
Income (loss) from discontinued operations	(0.1)	0.1	0	0.4
Equity in net income (loss) of subsidiaries	0	0	0	0
Net income (loss)	1.0	1.0	3.1	1.2
Comprehensive income (loss)	1.1	0.9	3.2	1.2
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0	0	0
Product sales	(3.6)	(3.7)	(6.5)	(3.7)
Total revenues	(3.6)	(3.7)	(6.5)	(3.7)
Cost of service revenue	0	0	0	0
Cost of product sales	(3.6)	(3.7)	(6.5)	(3.7)
Total costs	(3.6)	(3.7)	(6.5)	(3.7)
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	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	(2.5)	(11.8)	(19.4)	(21.4)
Net income (loss)	(2.5)	(11.8)	(19.4)	(21.4)
Comprehensive income (loss)	$ (2.6)	$ (11.5)	$ (19.3)	$ (21.4)