Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from operations of discontinued components	$ (5.7)	$ 1.3	$ (9.6)	$ 1.6
Income tax benefit (expense)	1.8	(0.6)	2.2	(0.8)
Income (loss) from discontinued operations	(3.9)	0.7	(7.4)	0.8
Herley | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	19.2	37.9	43.1	74.7
Cost of sales	14.5	28.0	33.4	55.8
Selling, general and administrative expenses	8.5	8.7	16.6	17.4
Other (income) expense, net	1.9	(0.1)	2.7	(0.1)
Income (loss) from discontinued operations before income taxes	(5.7)	1.3	(9.6)	1.6
Gain on disposal of discontinued operations before income taxes	0.0	0.0	0.0	0.0
Income (loss) from operations of discontinued components	(5.7)	1.3	(9.6)	1.6
Income tax benefit (expense)	1.8	(0.6)	2.2	(0.8)
Income (loss) from discontinued operations	$ (3.9)	$ 0.7	$ (7.4)	$ 0.8