Discontinued Operations - Financial Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations before income taxes	$ (0.7)	$ (1.4)	$ (2.1)	$ (2.8)
Income tax benefit (expense)	1.6	(0.4)	1.2	(0.6)
Income (loss) from discontinued operations	0.9	(1.8)	(0.9)	(3.4)
Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	22.3	25.1	47.8	51.4
Cost of sales	14.6	16.8	31.5	34.3
Selling, general and administrative expenses	5.5	5.9	11.6	11.8
Interest expense, net	3.4	4.1	6.9	8.4
Other net expense items that are not major	(0.5)	(0.3)	(0.1)	(0.3)
Loss from discontinued operations before income taxes	(0.7)	(1.4)	(2.1)	(2.8)
Income tax benefit (expense)	1.6	(0.4)	1.2	(0.6)
Income (loss) from discontinued operations	$ 0.9	$ (1.8)	$ (0.9)	$ (3.4)