Restructuring - Summary of restructuring costs by segment (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring charges
Restructuring expenses	$ 34.5	$ 4.3	$ 52.0	$ 17.6
Corporate
Restructuring charges
Restructuring expenses	$ (0.1)	$ 0.0	$ 1.1	$ 0.5
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Other charges, net	Other charges, net	Other charges, net	Other charges, net
Cost of revenues
Restructuring charges
Restructuring expenses	$ 20.2	$ 1.2	$ 27.2	$ 9.8
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Total cost of revenue	Total cost of revenue	Total cost of revenue	Total cost of revenue
Cost of revenues \| BSI BioSpin
Restructuring charges
Restructuring expenses	$ 2.2	$ 0.5	$ 3.4	$ 0.8
Cost of revenues \| BSI CALID
Restructuring charges
Restructuring expenses	12.5	0.0	14.3	0.8
Cost of revenues \| BSI Nano
Restructuring charges
Restructuring expenses	4.5	0.7	8.5	8.2
Cost of revenues \| BEST
Restructuring charges
Restructuring expenses	1.0	0.0	1.0	0.0
Other charges, net
Restructuring charges
Restructuring expenses	$ 14.3	$ 3.1	$ 24.8	$ 7.8
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Other charges, net	Other charges, net	Other charges, net	Other charges, net
Other charges, net \| BSI BioSpin
Restructuring charges
Restructuring expenses	$ 2.1	$ 1.2	$ 5.4	$ 1.4
Other charges, net \| BSI CALID
Restructuring charges
Restructuring expenses	6.7	0.7	9.9	0.7
Other charges, net \| BSI Nano
Restructuring charges
Restructuring expenses	5.2	1.2	8.0	5.2
Other charges, net \| BEST
Restructuring charges
Restructuring expenses	$ 0.4	$ 0.0	$ 0.4	$ 0.0