Segment Information (Sales By Major Product Group) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales	$ 5,085.7	$ 4,528.2	$ 4,510.1	$ 4,205.7	$ 4,584.3	$ 4,132.1	$ 4,241.9	$ 3,924.1	$ 18,329.7	$ 16,882.4	$ 14,433.7
Analytical and physical instrumentation
Sales									2,232.9	2,088.9	2,014.4
Research and medical products
Sales									11,512.4	10,366.7	8,110.9
Dental products
Sales									2,810.9	2,785.4	2,736.8
Product Identification
Sales									$ 1,773.5	$ 1,641.4	$ 1,571.6