Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Condensed Financial Statements, Captions [Line Items]
Service revenues	$ 87.2	$ 87.4	$ 258.0	$ 263.5
Product sales	78.2	74.3	228.6	216.1
Total revenues	165.4	161.7	486.6	479.6
Cost of service revenues	64.7	65.4	189.4	198.5
Cost of product sales	74.8	55.9	190.2	161.5
Total costs	139.5	121.3	379.6	360.0
Gross profit	25.9	40.4	107.0	119.6
Selling, general and administrative expenses	35.7	35.3	120.1	113.9
Research and development expenses	3.2	3.5	10.1	11.7
Operating income (loss) from continuing operations	(13.0)	1.6	(23.2)	(6.0)
Other income (expense):
Interest income (expense), net	(8.7)	(9.5)	(26.1)	(27.3)
Loss on extinguishment of debt	0.0	(3.4)	0.0	(3.4)
Other income (expense), net	0.1	0.3	0.6	(0.6)
Total other expense, net	(8.6)	(12.6)	(25.5)	(31.3)
Loss from continuing operations before income taxes	(21.6)	(11.0)	(48.7)	(37.3)
Provision for income taxes from continuing operations	1.9	(15.3)	7.3	(11.1)
Income (loss) from continuing operations	(23.5)	4.3	(56.0)	(26.2)
Income (loss) from discontinued operations	(0.1)	50.8	(0.2)	50.0
Equity in net income (loss) of subsidiaries	0.0	0.0	0.0	0.0
Net income (loss)	(23.6)	55.1	(56.2)	23.8
Comprehensive income (loss)	(23.7)	55.2	(56.4)	24.0
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues	0.0	0.0	0.0	0.0
Product sales	(2.0)	(1.2)	(5.6)	(7.4)
Total revenues	(2.0)	(1.2)	(5.6)	(7.4)
Cost of service revenues	0.0	0.0	0.0	0.0
Cost of product sales	(2.0)	(1.2)	(5.6)	(7.4)
Total costs	(2.0)	(1.2)	(5.6)	(7.4)
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
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	12.6	21.3	20.4	13.5
Net income (loss)	12.6	21.3	20.4	13.5
Comprehensive income (loss)	12.7	21.2	20.6	13.3
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	0.2	3.7	4.0	9.5
Research and development expenses	0.0	0.0	0.0	0.0
Operating income (loss) from continuing operations	(0.2)	(3.7)	(4.0)	(9.5)
Other income (expense):
Interest income (expense), net	(8.7)	(9.5)	(26.0)	(27.1)
Loss on extinguishment of debt		(3.4)		(3.4)
Other income (expense), net	0.0	1.4	0.0	0.0
Total other expense, net	(8.7)	(11.5)	(26.0)	(30.5)
Loss from continuing operations before income taxes	(8.9)	(15.2)	(30.0)	(40.0)
Provision for income taxes from continuing operations	0.1	(14.9)	0.2	(14.5)
Income (loss) from continuing operations	(9.0)	(0.3)	(30.2)	(25.5)
Income (loss) from discontinued operations	0.0	78.1	(0.1)	71.3
Equity in net income (loss) of subsidiaries	(14.6)	(22.7)	(25.9)	(22.0)
Net income (loss)	(23.6)	55.1	(56.2)	23.8
Comprehensive income (loss)	(23.7)	55.2	(56.4)	24.0
Subsidiary Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	84.3	84.4	244.0	254.6
Product sales	67.8	61.5	195.8	186.5
Total revenues	152.1	145.9	439.8	441.1
Cost of service revenues	62.9	63.4	179.6	192.0
Cost of product sales	67.7	46.4	165.9	140.7
Total costs	130.6	109.8	345.5	332.7
Gross profit	21.5	36.1	94.3	108.4
Selling, general and administrative expenses	33.3	29.5	109.1	98.0
Research and development expenses	3.1	3.4	9.9	11.3
Operating income (loss) from continuing operations	(14.9)	3.2	(24.7)	(0.9)
Other income (expense):
Interest income (expense), net	0.0	0.0	(0.1)	(0.2)
Loss on extinguishment of debt		0.0		0.0
Other income (expense), net	0.1	(1.1)	(0.1)	(3.3)
Total other expense, net	0.1	(1.1)	(0.2)	(3.5)
Loss from continuing operations before income taxes	(14.8)	2.1	(24.9)	(4.4)
Provision for income taxes from continuing operations	1.7	(1.1)	6.4	2.5
Income (loss) from continuing operations	(16.5)	3.2	(31.3)	(6.9)
Income (loss) from discontinued operations	(0.1)	(27.3)	(0.1)	(23.6)
Equity in net income (loss) of subsidiaries	2.0	1.4	5.5	8.5
Net income (loss)	(14.6)	(22.7)	(25.9)	(22.0)
Comprehensive income (loss)	(14.6)	(22.7)	(25.9)	(22.0)
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues	2.9	3.0	14.0	8.9
Product sales	12.4	14.0	38.4	37.0
Total revenues	15.3	17.0	52.4	45.9
Cost of service revenues	1.8	2.0	9.8	6.5
Cost of product sales	9.1	10.7	29.9	28.2
Total costs	10.9	12.7	39.7	34.7
Gross profit	4.4	4.3	12.7	11.2
Selling, general and administrative expenses	2.2	2.1	7.0	6.4
Research and development expenses	0.1	0.1	0.2	0.4
Operating income (loss) from continuing operations	2.1	2.1	5.5	4.4
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	0.7	2.7
Total other expense, net	0.0	0.0	0.7	2.7
Loss from continuing operations before income taxes	2.1	2.1	6.2	7.1
Provision for income taxes from continuing operations	0.1	0.7	0.7	0.9
Income (loss) from continuing operations	2.0	1.4	5.5	6.2
Income (loss) from discontinued operations	0.0	0.0	0.0	2.3
Equity in net income (loss) of subsidiaries	0.0	0.0	0.0	0.0
Net income (loss)	2.0	1.4	5.5	8.5
Comprehensive income (loss)	$ 1.9	$ 1.5	$ 5.3	$ 8.7