Acquisitions (Fair Values Of The Assets Acquired And Liabilities) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,077.5
Net cash consideration	2,067.8	$ 93.9
IDT
Business Acquisition [Line Items]
Trade accounts receivable	36.1
Inventories	15.6
Property, plant and equipment	108.8
Goodwill	1,077.5
Other intangible assets, primarily customer relationships, trade names and technology	957.0
Trade accounts payable	(5.5)
Other assets and liabilities, net	(97.8)
Net assets acquired	2,091.7
Less: noncash consideration	(23.9)
Net cash consideration	$ 2,067.8