Segment financial information - adjusted operating income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 6,552.2	$ 6,783.6	$ 6,967.2
Adjusted cost of goods and services sold	4,412.2	4,492.2	4,603.4
Adjusted operating expenses	1,182.2	1,201.6	1,152.0
Adjusted Operating Income	957.8	1,089.8	1,211.8
Adjusted cost of sales, non-GAAP adjustments	0.6
Adjusted operating expenses, non-GAAP adjustments	1,203.4	(7.1)	515.4
Operating Segments \| Laboratory Solutions
Segment Reporting Information [Line Items]
Net sales	4,399.7	4,610.1	4,738.3
Adjusted cost of goods and services sold	3,210.5	3,288.4	3,380.3
Adjusted operating expenses	678.8	723.7	689.7
Adjusted Operating Income	510.4	598.0	668.3
Operating Segments \| Bioscience Production
Segment Reporting Information [Line Items]
Net sales	2,152.5	2,173.5	2,228.9
Adjusted cost of goods and services sold	1,201.9	1,203.8	1,223.1
Adjusted operating expenses	432.8	411.5	403.9
Adjusted Operating Income	517.8	558.2	601.9
Corporate
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0
Adjusted cost of goods and services sold	(0.2)	0.0	0.0
Adjusted operating expenses	70.6	66.4	58.4
Adjusted Operating Income	$ (70.4)	$ (66.4)	$ (58.4)