Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 87.4	$ 100.6
Product sales	95.1	99.5
Total revenues	182.5	200.1
Cost of service revenues	66.0	74.1
Cost of product sales	69.6	73.4
Total costs	135.6	147.5
Gross profit	46.9	52.6
Selling, general and administrative expenses	43.6	44.1
Research and development expenses	4.8	5.2
Operating income (loss) from continuing operations	(1.5)	3.3
Other income (expense):
Interest expense, net	(12.2)	(16.1)
Other income (expense), net	(0.4)	0.2
Total other expense, net	(12.6)	(15.9)
Loss from continuing operations before income taxes	(14.1)	(12.6)
Provision for income taxes from continuing operations	2.4	2.3
Loss from continuing operations	(16.5)	(14.9)
Loss from discontinued operations	0.2	(0.1)
Equity in net income (loss) of subsidiaries	0	0
Net loss	(16.3)	(15.0)
Comprehensive income (loss)	(16.5)	(15.1)
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	5.1	5.0
Research and development expenses	0	0
Operating income (loss) from continuing operations	(5.1)	(5.0)
Other income (expense):
Interest expense, net	(12.1)	(16.0)
Other income (expense), net	0	(0.1)
Total other expense, net	(12.1)	(16.1)
Loss from continuing operations before income taxes	(17.2)	(21.1)
Provision for income taxes from continuing operations	0.3	0.3
Loss from continuing operations	(17.5)	(21.4)
Loss from discontinued operations	0.1	0
Equity in net income (loss) of subsidiaries	1.1	6.4
Net loss	(16.3)	(15.0)
Comprehensive income (loss)	(16.5)	(15.1)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	85.4	98.3
Product sales	82.9	86.3
Total revenues	168.3	184.6
Cost of service revenues	64.5	72.4
Cost of product sales	62.0	64.9
Total costs	126.5	137.3
Gross profit	41.8	47.3
Selling, general and administrative expenses	35.4	35.8
Research and development expenses	4.6	4.7
Operating income (loss) from continuing operations	1.8	6.8
Other income (expense):
Interest expense, net	(0.1)	0
Other income (expense), net	(3.1)	0.1
Total other expense, net	(3.2)	0.1
Loss from continuing operations before income taxes	(1.4)	6.9
Provision for income taxes from continuing operations	2.0	1.9
Loss from continuing operations	(3.4)	5.0
Loss from discontinued operations	0.1	(0.1)
Equity in net income (loss) of subsidiaries	4.4	1.5
Net loss	1.1	6.4
Comprehensive income (loss)	1.1	6.4
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	2.0	2.3
Product sales	15.2	16.6
Total revenues	17.2	18.9
Cost of service revenues	1.5	1.7
Cost of product sales	10.6	11.9
Total costs	12.1	13.6
Gross profit	5.1	5.3
Selling, general and administrative expenses	3.1	3.3
Research and development expenses	0.2	0.5
Operating income (loss) from continuing operations	1.8	1.5
Other income (expense):
Interest expense, net	0	(0.1)
Other income (expense), net	2.7	0.2
Total other expense, net	2.7	0.1
Loss from continuing operations before income taxes	4.5	1.6
Provision for income taxes from continuing operations	0.1	0.1
Loss from continuing operations	4.4	1.5
Loss from discontinued operations	0	0
Equity in net income (loss) of subsidiaries	0	0
Net loss	4.4	1.5
Comprehensive income (loss)	4.2	1.4
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0	0
Product sales	(3.0)	(3.4)
Total revenues	(3.0)	(3.4)
Cost of service revenues	0	0
Cost of product sales	(3.0)	(3.4)
Total costs	(3.0)	(3.4)
Gross profit	0	0
Selling, general and administrative expenses	0	0
Research and development expenses	0	0
Operating income (loss) 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
Loss from discontinued operations	0	0
Equity in net income (loss) of subsidiaries	(5.5)	(7.9)
Net loss	(5.5)	(7.9)
Comprehensive income (loss)	$ (5.3)	$ (7.8)