Discontinued Operations, Danaher Separation And Other Disposition Discontinued Operations, Danaher Separation And Other Disposition (Components Of Income Related To Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Jul. 14, 2015	Oct. 02, 2015	Sep. 26, 2014	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from discontinued operations, net of income taxes	$ 813.3	$ (0.7)		$ 805.3	$ 43.1
Communications business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	0.0	163.2	$ 346.0	345.7	566.8	$ 760.0
Operating expenses	0.0	(163.6)		(329.7)	(502.6)
Allocated interest expense	0.0	(0.9)		(1.8)	(2.8)
Income before taxes	0.0	(1.3)		14.2	61.4
Income tax (benefit) expense	0.0	0.6		(22.2)	(18.3)
(Loss) income from discontinued operations	0.0	(0.7)		(8.0)	43.1
Gain on disposition, including $6.2 of related income tax benefit	813.3	0.0		813.3	0.0
Earnings from discontinued operations, net of income taxes	$ 813.3	$ (0.7)		805.3	$ 43.1
Income tax benefit, related to gain on disposition				$ (6.2)