Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ (0.1)	$ 0.4
Loss from discontinued operations	(0.6)	(3.5)
Herley | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0.1	23.9
Cost of sales	0.5	18.9
Selling, general and administrative expenses	0.1	8.1
Other expense	0.0	0.8
Loss from discontinued operations before income taxes	(0.5)	(3.9)
Income tax expense	(0.1)	0.4
Loss from discontinued operations	$ (0.6)	$ (3.5)