Segment Information (Segment Results) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Sales	$ 5,883.2	$ 4,378.0	$ 15,523.7	$ 13,042.7
Operating profit	1,087.6	776.3	2,629.7	2,307.7
Identifiable assets	72,890.7		72,890.7		$ 62,081.6
Other
Segment Reporting Information [Line Items]
Operating profit	(70.4)	(88.7)	(272.6)	(231.1)
Identifiable assets	6,174.9		6,174.9		20,376.3
Life Sciences | Operating segments
Segment Reporting Information [Line Items]
Sales	2,922.5	1,695.6	7,215.3	5,035.1
Operating profit	504.9	342.5	1,242.9	995.5
Identifiable assets	47,084.5		47,084.5		22,381.3
Diagnostics | Operating segments
Segment Reporting Information [Line Items]
Sales	1,889.1	1,601.9	5,176.3	4,757.0
Operating profit	408.0	266.0	952.4	782.0
Identifiable assets	14,715.9		14,715.9		14,442.2
Environmental & Applied Solutions | Operating segments
Segment Reporting Information [Line Items]
Sales	1,071.6	1,080.5	3,132.1	3,250.6
Operating profit	245.1	$ 256.5	707.0	$ 761.3
Identifiable assets	$ 4,915.4		$ 4,915.4		$ 4,881.8