Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2016	Mar. 29, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 0.0	$ (0.4)
Loss from discontinued operations	0.0	(1.7)
Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0.0	25.5
Cost of sales	0.0	16.9
Selling, general and administrative expenses	0.0	6.1
Interest expense, net	0.0	3.4
Other net expense items that are not major	0.0	0.4
Loss from discontinued operations before income taxes	0.0	(1.3)
Income tax expense	0.0	(0.4)
Loss from discontinued operations	$ 0.0	$ (1.7)