Acquisitions - Consideration transferred and reportable segment (Details) - USD ($) $ in Millions								12 Months Ended
	Aug. 07, 2020	Apr. 01, 2020	Nov. 01, 2019	Oct. 02, 2019	Jul. 01, 2019	Mar. 07, 2019	Mar. 04, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquisitions
Cash paid for acquisitions, net of cash acquired								$ 59.2	$ 90.0	$ 191.6
2019 Acquisitions
Acquisitions
Consideration									38.1
Cash paid for acquisitions, net of cash acquired									$ 34.9
2020 Acquisitions
Acquisitions
Consideration								6.1
Cash paid for acquisitions, net of cash acquired								$ 5.4
Arxspan, LLC | BSI Life Science
Acquisitions
Consideration							$ 16.6
Cash paid for acquisitions, net of cash acquired							$ 14.4
Ampegon PPT GmbH | BEST
Acquisitions
Consideration						$ 2.0
Cash paid for acquisitions, net of cash acquired						$ 2.0
PMOD Technologies GmbH | BSI Life Science
Acquisitions
Consideration					$ 8.9
Cash paid for acquisitions, net of cash acquired					$ 7.9
Smart Tip B.v. | BSI NANO
Acquisitions
Consideration		$ 3.1
Cash paid for acquisitions, net of cash acquired		$ 2.4
Integrated Proteomics Applications, Inc. | BSI Life Science
Acquisitions
Consideration	$ 3.0
Cash paid for acquisitions, net of cash acquired	$ 3.0
Magnettech Gmbh | BSI Life Science
Acquisitions
Consideration				$ 9.3
Cash paid for acquisitions, net of cash acquired				$ 9.3
Biovendor Instruments | BSI Life Science
Acquisitions
Consideration			$ 1.3
Cash paid for acquisitions, net of cash acquired			$ 1.3