Discontinued Operations - Financial Results (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Aug. 21, 2015	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
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
Total gain (loss) on discontinued operations before income taxes		77.0	$ 0.4	75.0	$ (2.3)
Income tax expense		(26.2)	0.0	(25.0)	(0.6)
Income (loss) from discontinued operations		50.8	0.4	50.0	(2.9)
Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		11.9	27.3	59.7	78.7
Cost of sales		9.0	16.7	40.6	51.0
Selling, general and administrative expenses		3.7	6.2	15.2	18.1
Interest expense, net		2.3	3.4	9.1	11.7
Other net expense items that are not major		0.2	0.6	0.1	0.2
Income (loss) from discontinued operations before income taxes		(3.3)	0.4	(5.3)	(2.3)
Gain on disposal of discontinued operations before income taxes		80.3	0.0	80.3	0.0
Total gain (loss) on discontinued operations before income taxes		77.0	0.4	75.0	(2.3)
Income tax expense	$ (8.9)	(26.2)	0.0	(25.0)	(0.6)
Income (loss) from discontinued operations		$ 50.8	$ 0.4	$ 50.0	$ (2.9)