Segment Information (Segment Results) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Sales	$ 5,297.4	$ 4,444.5	$ 9,640.5	$ 8,664.7
Operating profit	844.6	811.7	1,542.1	1,531.4
Identifiable assets	71,268.4		71,268.4		$ 62,081.6
Other
Segment Reporting Information [Line Items]
Operating profit	(83.0)	(75.4)	(202.2)	(142.4)
Identifiable assets	5,872.5		5,872.5		20,376.3
Life Sciences | Operating segments
Segment Reporting Information [Line Items]
Sales	2,642.4	1,712.6	4,292.8	3,339.5
Operating profit	412.4	344.0	738.0	653.0
Identifiable assets	46,017.5		46,017.5		22,381.3
Diagnostics | Operating segments
Segment Reporting Information [Line Items]
Sales	1,660.2	1,618.3	3,287.2	3,155.1
Operating profit	293.2	282.9	544.4	516.0
Identifiable assets	14,587.0		14,587.0		14,442.2
Environmental & Applied Solutions | Operating segments
Segment Reporting Information [Line Items]
Sales	994.8	1,113.6	2,060.5	2,170.1
Operating profit	222.0	$ 260.2	461.9	$ 504.8
Identifiable assets	$ 4,791.4		$ 4,791.4		$ 4,881.8