Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of discontinued operations before income taxes		$ 80.3		$ 80.3
Income (loss) on discontinued operations before income taxes	$ (0.1)	77.0	$ (0.1)	75.0
Income tax benefit	0.0	(26.2)	(0.1)	(25.0)
Income (loss) from discontinued operations	(0.1)	50.8	(0.2)	50.0
Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0.0	11.9	0.0	59.7
Cost of sales	0.0	9.0	0.0	40.6
Selling, general and administrative expenses	0.1	3.7	0.1	15.2
Interest expense, net	0.0	2.3	0.0	9.1
Other net expense items that are not major	0.0	0.2	0.0	0.1
Loss from discontinued operations before income taxes	(0.1)	(3.3)	(0.1)	(5.3)
Gain on disposal of discontinued operations before income taxes	0.0	80.3	0.0	80.3
Income (loss) on discontinued operations before income taxes	(0.1)	77.0	(0.1)	75.0
Income tax benefit	0.0	(26.2)	(0.1)	(25.0)
Income (loss) from discontinued operations	$ (0.1)	$ 50.8	$ (0.2)	$ 50.0