Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Condensed Financial Statements, Captions [Line Items]
Service revenues									$ 354.2	$ 390.8	$ 443.6
Product sales									302.9	372.2	400.5
Total revenues	$ 177.5	$ 161.7	$ 160.8	$ 157.1	$ 192.1	$ 190.8	$ 205.5	$ 174.6	657.1	763.0	844.1
Cost of service revenues									266.5	304.6	335.2
Cost of product sales									228.8	279.0	304.4
Total costs									495.3	583.6	639.6
Gross profit	42.2	40.4	40.9	38.3	45.1	42.4	48.1	43.8	161.8	179.4	204.5
Selling, general and administrative expenses									150.1	155.5	166.6
Research and development expenses									16.2	18.6	19.7
Operating income (loss) from continuing operations	1.5	1.6	(3.7)	(3.9)	5.6	(3.0)	2.3	0.4	(4.5)	5.3	18.2
Other income (expense):
Interest income (expense), net									(36.0)	(39.2)	(46.2)
Loss on extinguishment of debt							(39.1)		(3.4)	(39.1)	0.0
Other income (expense), net									(0.7)	1.2	(0.4)
Total other expense, net									(40.1)	(77.1)	(46.6)
Loss from continuing operations before income taxes									(44.6)	(71.8)	(28.4)
Provision (benefit) for income taxes from continuing operations	(0.3)	(15.3)	2.3	1.9	0.8	(0.2)	1.2	2.1	(11.4)	3.9	1.1
Income (loss) from continuing operations									(33.2)	(75.7)	(29.5)
Income (loss) from discontinued operations									53.0	(2.3)	(7.7)
Equity in net income (loss) of subsidiaries									0.0	0.0	0.0
Net income (loss)	$ (4.0)	$ 55.1	$ (15.1)	$ (16.2)	$ (2.2)	$ (10.9)	$ (49.9)	$ (15.0)	19.8	(78.0)	(37.2)
Comprehensive income (loss)									20.1	(78.9)	(37.2)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Service revenues									0.0	0.0	0.0
Product sales									0.0	0.0	0.0
Total revenues									0.0	0.0	0.0
Cost of service revenues									0.0	0.0	0.0
Cost of product sales									0.0	0.0	0.0
Total costs									0.0	0.0	0.0
Gross profit									0.0	0.0	0.0
Selling, general and administrative expenses									10.1	8.4	5.5
Research and development expenses									0.0	0.0	0.0
Operating income (loss) from continuing operations									(10.1)	(8.4)	(5.5)
Other income (expense):
Interest income (expense), net									(35.8)	(39.3)	(48.1)
Loss on extinguishment of debt									(3.4)	(39.1)
Other income (expense), net									0.0	0.0	0.0
Total other expense, net									(39.2)	(78.4)	(48.1)
Loss from continuing operations before income taxes									(49.3)	(86.8)	(53.6)
Provision (benefit) for income taxes from continuing operations									(17.8)	0.6	0.7
Income (loss) from continuing operations									(31.5)	(87.4)	(54.3)
Income (loss) from discontinued operations									71.8	(14.7)	(17.4)
Equity in net income (loss) of subsidiaries									(20.5)	24.1	34.5
Net income (loss)									19.8	(78.0)	(37.2)
Comprehensive income (loss)									20.1	(78.9)	(37.2)
Subsidiary Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues									339.0	380.8	438.2
Product sales									262.3	326.1	358.6
Total revenues									601.3	706.9	796.8
Cost of service revenues									255.5	297.0	331.3
Cost of product sales									203.1	247.9	278.8
Total costs									458.6	544.9	610.1
Gross profit									142.7	162.0	186.7
Selling, general and administrative expenses									130.8	136.7	150.7
Research and development expenses									15.7	17.4	18.8
Operating income (loss) from continuing operations									(3.8)	7.9	17.2
Other income (expense):
Interest income (expense), net									(0.1)	0.3	2.2
Loss on extinguishment of debt									0.0	0.0
Other income (expense), net									(3.3)	(2.0)	(0.3)
Total other expense, net									(3.4)	(1.7)	1.9
Loss from continuing operations before income taxes									(7.2)	6.2	19.1
Provision (benefit) for income taxes from continuing operations									4.4	2.8	0.4
Income (loss) from continuing operations									(11.6)	3.4	18.7
Income (loss) from discontinued operations									(21.1)	9.3	7.9
Equity in net income (loss) of subsidiaries									12.2	11.4	7.9
Net income (loss)									(20.5)	24.1	34.5
Comprehensive income (loss)									(20.5)	23.6	34.5
Non-Guarantors on a Combined Basis
Condensed Financial Statements, Captions [Line Items]
Service revenues									15.2	10.0	5.4
Product sales									56.3	54.6	58.8
Total revenues									71.5	64.6	64.2
Cost of service revenues									11.0	7.6	3.9
Cost of product sales									41.4	39.6	42.5
Total costs									52.4	47.2	46.4
Gross profit									19.1	17.4	17.8
Selling, general and administrative expenses									9.2	10.4	10.4
Research and development expenses									0.5	1.2	0.9
Operating income (loss) from continuing operations									9.4	5.8	6.5
Other income (expense):
Interest income (expense), net									(0.1)	(0.2)	(0.3)
Loss on extinguishment of debt									0.0	0.0
Other income (expense), net									2.6	3.2	(0.1)
Total other expense, net									2.5	3.0	(0.4)
Loss from continuing operations before income taxes									11.9	8.8	6.1
Provision (benefit) for income taxes from continuing operations									2.0	0.5	0.0
Income (loss) from continuing operations									9.9	8.3	6.1
Income (loss) from discontinued operations									2.3	3.1	1.8
Equity in net income (loss) of subsidiaries									0.0	0.0	0.0
Net income (loss)									12.2	11.4	7.9
Comprehensive income (loss)									12.3	11.0	7.9
Eliminations
Condensed Financial Statements, Captions [Line Items]
Service revenues									0.0	0.0	0.0
Product sales									(15.7)	(8.5)	(16.9)
Total revenues									(15.7)	(8.5)	(16.9)
Cost of service revenues									0.0	0.0	0.0
Cost of product sales									(15.7)	(8.5)	(16.9)
Total costs									(15.7)	(8.5)	(16.9)
Gross profit									0.0	0.0	0.0
Selling, general and administrative expenses									0.0	0.0	0.0
Research and development expenses									0.0	0.0	0.0
Operating income (loss) from continuing operations									0.0	0.0	0.0
Other income (expense):
Interest income (expense), net									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
Total other expense, net									0.0	0.0	0.0
Loss from continuing operations before income taxes									0.0	0.0	0.0
Provision (benefit) for income taxes from continuing operations									0.0	0.0	0.0
Income (loss) from continuing operations									0.0	0.0	0.0
Income (loss) from discontinued operations									0.0	0.0	0.0
Equity in net income (loss) of subsidiaries									8.3	(35.5)	(42.4)
Net income (loss)									8.3	(35.5)	(42.4)
Comprehensive income (loss)									$ 8.2	$ (34.6)	$ (42.4)