Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 88.8	$ 101.8	$ 176.1	$ 202.4
Product sales	71.7	102.4	141.3	175.6
Total revenues	160.5	204.2	317.4	378.0
Cost of service revenues	67.1	77.9	133.1	152.0
Cost of product sales	52.5	78.2	105.1	134.1
Total costs	119.6	156.1	238.2	286.1
Gross profit	40.9	48.1	79.2	91.9
Selling, general and administrative expenses	40.3	41.2	78.6	80.5
Research and development expenses	4.3	4.6	8.2	8.7
Operating income (loss) from continuing operations	(3.7)	2.3	(7.6)	2.7
Other income (expense):
Interest income (expense), net	(8.9)	(9.9)	(17.7)	(21.7)
Loss on extinguishment of debt	0.0	(39.1)	0.0	(39.1)
Other income (expense), net	(1.0)	(0.2)	(0.9)	(0.1)
Total other expense, net	(9.9)	(49.2)	(18.6)	(60.9)
Loss from continuing operations before income taxes	(13.6)	(46.9)	(26.2)	(58.2)
Provision for income taxes from continuing operations	2.3	1.2	4.2	3.3
Loss from continuing operations	(15.9)	(48.1)	(30.4)	(61.5)
Income (loss) from discontinued operations	0.9	(1.8)	(0.9)	(3.4)
Equity in net income (loss) of subsidiaries	0.0	0.0	0.0	0.0
Net loss	(15.0)	(49.9)	(31.3)	(64.9)
Comprehensive income (loss)	(14.7)	(49.9)	(31.2)	(65.0)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Service revenues	0.0	0.0	0.0	0.0
Product sales	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Cost of service revenues	0.0	0.0	0.0	0.0
Cost of product sales	0.0	0.0	0.0	0.0
Total costs	0.0	0.0	0.0	0.0
Gross profit	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	0.7	4.0	5.8	9.0
Research and development expenses	0.0	0.0	0.0	0.0
Operating income (loss) from continuing operations	(0.7)	(4.0)	(5.8)	(9.0)
Other income (expense):
Interest income (expense), net	(8.8)	(10.0)	(17.5)	(21.6)
Loss on extinguishment of debt		(39.1)		(39.1)
Other income (expense), net	(1.4)	0.1	(1.4)	0.0
Total other expense, net	(10.2)	(49.0)	(18.9)	(60.7)
Loss from continuing operations before income taxes	(10.9)	(53.0)	(24.7)	(69.7)
Provision for income taxes from continuing operations	0.2	0.2	0.4	0.5
Loss from continuing operations	(11.1)	(53.2)	(25.1)	(70.2)
Income (loss) from discontinued operations	(0.1)	0.0	0.0	0.0
Equity in net income (loss) of subsidiaries	(3.8)	3.3	(6.2)	5.3
Net loss	(15.0)	(49.9)	(31.3)	(64.9)
Comprehensive income (loss)	(14.7)	(49.9)	(31.2)	(65.0)
Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	84.7	99.9	170.2	198.2
Product sales	62.8	92.0	124.5	155.9
Total revenues	147.5	191.9	294.7	354.1
Cost of service revenues	63.9	76.3	128.6	148.7
Cost of product sales	46.7	70.9	93.8	120.1
Total costs	110.6	147.2	222.4	268.8
Gross profit	36.9	44.7	72.3	85.3
Selling, general and administrative expenses	37.5	34.8	68.5	66.6
Research and development expenses	4.1	4.4	7.9	8.1
Operating income (loss) from continuing operations	(4.7)	5.5	(4.1)	10.6
Other income (expense):
Interest income (expense), net	(0.1)	0.2	(0.2)	0.1
Loss on extinguishment of debt		0.0		0.0
Other income (expense), net	0.8	(0.2)	(2.2)	(0.1)
Total other expense, net	0.7	0.0	(2.4)	0.0
Loss from continuing operations before income taxes	(4.0)	5.5	(6.5)	10.6
Provision for income taxes from continuing operations	1.8	0.9	3.6	2.7
Loss from continuing operations	(5.8)	4.6	(10.1)	7.9
Income (loss) from discontinued operations	(0.5)	(2.3)	(3.2)	(5.2)
Equity in net income (loss) of subsidiaries	2.5	1.0	7.1	2.6
Net loss	(3.8)	3.3	(6.2)	5.3
Comprehensive income (loss)	(5.6)	3.3	(6.2)	5.3
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	4.1	1.9	5.9	4.2
Product sales	12.2	12.8	23.0	24.6
Total revenues	16.3	14.7	28.9	28.8
Cost of service revenues	3.2	1.6	4.5	3.3
Cost of product sales	9.1	9.7	17.5	18.9
Total costs	12.3	11.3	22.0	22.2
Gross profit	4.0	3.4	6.9	6.6
Selling, general and administrative expenses	2.1	2.4	4.3	4.9
Research and development expenses	0.2	0.2	0.3	0.6
Operating income (loss) from continuing operations	1.7	0.8	2.3	1.1
Other income (expense):
Interest income (expense), net	0.0	(0.1)	0.0	(0.2)
Loss on extinguishment of debt		0.0		0.0
Other income (expense), net	(0.4)	(0.1)	2.7	0.0
Total other expense, net	(0.4)	(0.2)	2.7	(0.2)
Loss from continuing operations before income taxes	1.3	0.6	5.0	0.9
Provision for income taxes from continuing operations	0.3	0.1	0.2	0.1
Loss from continuing operations	1.0	0.5	4.8	0.8
Income (loss) from discontinued operations	1.5	0.5	2.3	1.8
Equity in net income (loss) of subsidiaries	0.0	0.0	0.0	0.0
Net loss	2.5	1.0	7.1	2.6
Comprehensive income (loss)	2.8	1.0	7.2	2.5
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0.0	0.0	0.0	0.0
Product sales	(3.3)	(2.4)	(6.2)	(4.9)
Total revenues	(3.3)	(2.4)	(6.2)	(4.9)
Cost of service revenues	0.0	0.0	0.0	0.0
Cost of product sales	(3.3)	(2.4)	(6.2)	(4.9)
Total costs	(3.3)	(2.4)	(6.2)	(4.9)
Gross profit	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	0.0	0.0	0.0	0.0
Research and development expenses	0.0	0.0	0.0	0.0
Operating income (loss) from continuing operations	0.0	0.0	0.0	0.0
Other income (expense):
Interest income (expense), net	0.0	0.0	0.0	0.0
Loss on extinguishment of debt		0.0		0.0
Other income (expense), net	0.0	0.0	0.0	0.0
Total other expense, net	0.0	0.0	0.0	0.0
Loss from continuing operations before income taxes	0.0	0.0	0.0	0.0
Provision for income taxes from continuing operations	0.0	0.0	0.0	0.0
Loss from continuing operations	0.0	0.0	0.0	0.0
Income (loss) from discontinued operations	0.0	0.0	0.0	0.0
Equity in net income (loss) of subsidiaries	1.3	(4.3)	(0.9)	(7.9)
Net loss	1.3	(4.3)	(0.9)	(7.9)
Comprehensive income (loss)	$ 2.8	$ (4.3)	$ (1.0)	$ (7.8)