Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 0.1	$ 1.8	$ 0.0	$ 2.2
Income (loss) from discontinued operations	3.0	(3.9)	2.4	(7.4)
Herley | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0.0	19.2	0.1	43.1
Cost of sales	0.2	14.5	0.7	33.4
Selling, general and administrative expenses	0.5	8.5	0.6	16.6
Other (income) expense	(3.6)	1.9	(3.6)	2.7
Income (loss) from discontinued operations before income taxes	2.9	(5.7)	2.4	(9.6)
Income tax expense	0.1	1.8	0.0	2.2
Income (loss) from discontinued operations	$ 3.0	$ (3.9)	$ 2.4	$ (7.4)