Business Segment Information - Information by Segment (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Business segment information
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]		srt:ChiefExecutiveOfficerMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description		The chief operating decision maker uses segment operating income (loss) to assess the performance for each segment by comparing the results of each segment with one another, comparing actual results to budget and prior year, as well as to allocate resources.
Total segment revenue		$ 801.4	$ 721.7
Operating expenses:
Selling, general and administrative		225.4	195.3
Research and development		97.1	81.8
Operating Income		31.8	64.8
Interest and other income (expense), net		(6.7)	6.8
Income before income taxes, equity in income of unconsolidated investees, net of tax, and noncontrolling interests in consolidated subsidiaries		25.1	71.6
Assets		5,933.1		$ 5,806.7
Capital Expenditures		26.0	21.4
Depreciation and Amortization		50.4	34.7
Operating segments
Business segment information
Total segment revenue		803.8	724.2
Operating expenses:
Cost of revenue		392.8	355.4
Selling, general and administrative		186.5	163.5
Research and development		95.8	81.6
Operating Income		128.7	123.7
Intersegment revenue
Business segment information
Total segment revenue		2.4	2.5
Corporate, eliminations and other
Operating expenses:
Operating Income	[1]	26.9	23.1
Assets	[2]	(40.4)		(41.5)
BSI BioSpin
Business segment information
Total segment revenue		207.8	182.8
Operating expenses:
Capital Expenditures		3.2	(0.4)
Depreciation and Amortization		10.4	8.2
BSI BioSpin | Operating segments
Business segment information
Total segment revenue		207.8	182.8
Operating expenses:
Cost of revenue		109.7	89.1
Selling, general and administrative		39.0	37.0
Research and development		22.0	22.1
Operating Income		37.1	34.6
BSI BioSpin | Intersegment revenue
Business segment information
Total segment revenue		0.0	0.0
BSI CALID
Business segment information
Total segment revenue		280.1	227.9
Operating expenses:
Capital Expenditures		8.4	5.3
Depreciation and Amortization		19.8	9.8
BSI CALID | Operating segments
Business segment information
Total segment revenue		280.1	227.9
Operating expenses:
Cost of revenue		117.8	93.8
Selling, general and administrative		72.9	57.8
Research and development		27.9	25.2
Operating Income		61.5	51.1
BSI CALID | Intersegment revenue
Business segment information
Total segment revenue		0.0	0.0
BSI Nano
Business segment information
Total segment revenue		256.6	240.4
Operating expenses:
Capital Expenditures		4.9	6.2
Depreciation and Amortization		16.7	13.4
BSI Nano | Operating segments
Business segment information
Total segment revenue		256.6	240.4
Operating expenses:
Cost of revenue		118.9	114.0
Selling, general and administrative		69.3	63.0
Research and development		45.3	33.6
Operating Income		23.1	29.8
BSI Nano | Intersegment revenue
Business segment information
Total segment revenue		0.0	0.0
BEST
Business segment information
Total segment revenue		56.9	70.6
Operating expenses:
Capital Expenditures		4.8	7.6
Depreciation and Amortization		2.1	2.0
BEST | Operating segments
Business segment information
Total segment revenue		59.3	73.1
Operating expenses:
Cost of revenue		46.4	58.5
Selling, general and administrative		5.3	5.7
Research and development		0.6	0.7
Operating Income		7.0	8.2
Assets		204.9		199.8
BEST | Intersegment revenue
Business segment information
Total segment revenue		2.4	2.5
BSI Biospin, BSI CALID, BSI NANO & Corporate | Operating segments
Operating expenses:
Assets		5,768.6		$ 5,648.4
Corporate
Operating expenses:
Capital Expenditures		4.7	2.7
Depreciation and Amortization		1.4	1.3
Unallocated Expenses
Operating expenses:
Operating Income	[3]	$ 70.0	$ 35.8

[1] Represents corporate costs and intersegment eliminations not allocated to the reportable segments. Unallocated costs include general and administrative expenses not directly incurred by the segments such as professional fees incurred for the quarterly reviews and annual audit of the consolidated financial statements, personnel costs of corporate accounting, finance, legal and IT resources, and other expense items.

[2] Assets not allocated to the reportable segments and eliminations of intercompany transactions.

[3] Unallocated expenses consist of costs related to restructuring actions, acquisition and related integration expenses, amortization of acquired intangible assets, costs associated with our global information technology transition initiatives, and other costs.