Condensed Consolidating Financial Statements - Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 87.4	$ 97.1	$ 263.5	$ 299.5
Product sales	74.3	93.7	216.1	271.4
Total revenues	161.7	190.8	479.6	570.9
Cost of service revenues	65.4	77.7	198.5	229.7
Cost of product sales	55.9	70.7	161.5	206.9
Total costs	121.3	148.4	360.0	436.6
Gross profit	40.4	42.4	119.6	134.3
Selling, general and administrative expenses	35.3	40.5	113.9	121.0
Research and development expenses	3.5	4.9	11.7	13.6
Operating income (loss) from continuing operations	1.6	(3.0)	(6.0)	(0.3)
Other income (expense):
Interest income (expense), net	(9.5)	(8.7)	(27.3)	(30.5)
Loss on extinguishment of debt	(3.4)	0.0	(3.4)	(39.1)
Other income (expense), net	0.3	0.2	(0.6)	0.1
Total other expense, net	(12.6)	(8.5)	(31.3)	(69.5)
Loss from continuing operations before income taxes	(11.0)	(11.5)	(37.3)	(69.8)
Provision (benefit) for income taxes from continuing operations	(15.3)	(0.2)	(11.1)	3.1
Income (loss) from continuing operations	4.3	(11.3)	(26.2)	(72.9)
Income (loss) from discontinued operations	50.8	0.4	50.0	(2.9)
Equity in net income (loss) of subsidiaries	0.0	0.0	0.0	0.0
Net income (loss)	55.1	(10.9)	23.8	(75.8)
Comprehensive income (loss)	55.2	(11.0)	24.0	(76.0)
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	3.7	2.9	9.5	11.9
Research and development expenses	0.0	0.0	0.0	0.0
Operating income (loss) from continuing operations	(3.7)	(2.9)	(9.5)	(11.9)
Other income (expense):
Interest income (expense), net	(9.5)	(8.8)	(27.1)	(30.5)
Loss on extinguishment of debt	(3.4)		(3.4)	(39.1)
Other income (expense), net	1.4	0.0	0.0	0.0
Total other expense, net	(11.5)	(8.8)	(30.5)	(69.6)
Loss from continuing operations before income taxes	(15.2)	(11.7)	(40.0)	(81.5)
Provision (benefit) for income taxes from continuing operations	(14.9)	0.1	(14.5)	0.6
Income (loss) from continuing operations	(0.3)	(11.8)	(25.5)	(82.1)
Income (loss) from discontinued operations	78.1	(3.2)	71.3	(11.4)
Equity in net income (loss) of subsidiaries	(22.7)	4.1	(22.0)	17.7
Net income (loss)	55.1	(10.9)	23.8	(75.8)
Comprehensive income (loss)	55.2	(11.0)	24.0	(76.0)
Subsidiary Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	84.4	94.1	254.6	292.3
Product sales	61.5	81.1	186.5	239.1
Total revenues	145.9	175.2	441.1	531.4
Cost of service revenues	63.4	75.4	192.0	224.1
Cost of product sales	46.4	62.3	140.7	184.5
Total costs	109.8	137.7	332.7	408.6
Gross profit	36.1	37.5	108.4	122.8
Selling, general and administrative expenses	29.5	35.1	98.0	101.7
Research and development expenses	3.4	4.5	11.3	12.6
Operating income (loss) from continuing operations	3.2	(2.1)	(0.9)	8.5
Other income (expense):
Interest income (expense), net	0.0	0.1	(0.2)	0.2
Loss on extinguishment of debt	0.0		0.0	0.0
Other income (expense), net	(1.1)	0.1	(3.3)	0.0
Total other expense, net	(1.1)	0.2	(3.5)	0.2
Loss from continuing operations before income taxes	2.1	(1.9)	(4.4)	8.7
Provision (benefit) for income taxes from continuing operations	(1.1)	(1.0)	2.5	1.7
Income (loss) from continuing operations	3.2	(0.9)	(6.9)	7.0
Income (loss) from discontinued operations	(27.3)	2.3	(23.6)	5.4
Equity in net income (loss) of subsidiaries	1.4	2.7	8.5	5.3
Net income (loss)	(22.7)	4.1	(22.0)	17.7
Comprehensive income (loss)	(22.7)	4.1	(22.0)	17.7
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	3.0	3.0	8.9	7.2
Product sales	14.0	14.3	37.0	38.9
Total revenues	17.0	17.3	45.9	46.1
Cost of service revenues	2.0	2.3	6.5	5.6
Cost of product sales	10.7	10.1	28.2	29.0
Total costs	12.7	12.4	34.7	34.6
Gross profit	4.3	4.9	11.2	11.5
Selling, general and administrative expenses	2.1	2.5	6.4	7.4
Research and development expenses	0.1	0.4	0.4	1.0
Operating income (loss) from continuing operations	2.1	2.0	4.4	3.1
Other income (expense):
Interest income (expense), net	0.0	0.0	0.0	(0.2)
Loss on extinguishment of debt	0.0		0.0	0.0
Other income (expense), net	0.0	0.1	2.7	0.1
Total other expense, net	0.0	0.1	2.7	(0.1)
Loss from continuing operations before income taxes	2.1	2.1	7.1	3.0
Provision (benefit) for income taxes from continuing operations	0.7	0.7	0.9	0.8
Income (loss) from continuing operations	1.4	1.4	6.2	2.2
Income (loss) from discontinued operations	0.0	1.3	2.3	3.1
Equity in net income (loss) of subsidiaries	0.0	0.0	0.0	0.0
Net income (loss)	1.4	2.7	8.5	5.3
Comprehensive income (loss)	1.5	2.6	8.7	5.1
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0.0	0.0	0.0	0.0
Product sales	(1.2)	(1.7)	(7.4)	(6.6)
Total revenues	(1.2)	(1.7)	(7.4)	(6.6)
Cost of service revenues	0.0	0.0	0.0	0.0
Cost of product sales	(1.2)	(1.7)	(7.4)	(6.6)
Total costs	(1.2)	(1.7)	(7.4)	(6.6)
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	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 (benefit) for income taxes from continuing operations	0.0	0.0	0.0	0.0
Income (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	21.3	(6.8)	13.5	(23.0)
Net income (loss)	21.3	(6.8)	13.5	(23.0)
Comprehensive income (loss)	$ 21.2	$ (6.7)	$ 13.3	$ (22.8)