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Business Segment Information - Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 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 $ 860.5 $ 864.4 $ 2,459.3 $ 2,386.8  
Operating expenses:          
Selling, general and administrative 242.5 229.9 699.3 646.5  
Research and development 98.3 98.1 295.6 272.1  
Operating Income (51.8) 68.1 (8.1) 181.0  
Interest and other (expense), net (20.0) (12.8) (38.1) (30.2)  
(Loss) income before income taxes, equity in income (losses) of unconsolidated investees, net of tax, and noncontrolling interests in consolidated subsidiaries (71.8) 55.3 (46.2) 150.8  
Assets 6,434.9   6,434.9   $ 5,806.7
Capital Expenditures 18.6 32.6 74.9 78.6  
Depreciation and Amortization 55.7 51.0 162.2 130.9  
Operating segments          
Business segment information          
Total segment revenue 861.7 868.2 2,465.0 2,397.1  
Operating expenses:          
Cost of revenue 431.1 425.7 1,235.5 1,175.2  
Selling, general and administrative 192.8 191.5 575.5 539.1  
Research and development 97.9 97.2 292.3 270.3  
Other charges, net 0.1 0.0 0.1    
Operating Income 139.8 153.8 361.6 412.5  
Intersegment revenue          
Business segment information          
Total segment revenue 1.2 3.8 5.7 10.3  
Corporate, eliminations and other          
Operating expenses:          
Operating Income [1] 34.0 24.7 82.1 72.1  
Assets [2] (43.4)   (43.4)   (41.5)
BSI BioSpin          
Business segment information          
Total segment revenue 208.7 233.0 611.8 633.3  
Operating expenses:          
Capital Expenditures 4.8 13.4 10.3 16.8  
Depreciation and Amortization 10.1 10.8 31.7 29.4  
BSI BioSpin | Operating segments          
Business segment information          
Total segment revenue 208.7 233.0 611.8 633.3  
Operating expenses:          
Cost of revenue 111.2 113.5 329.0 313.4  
Selling, general and administrative 41.3 39.7 121.2 115.0  
Research and development 22.8 23.0 68.0 66.9  
Other charges, net 0.1 0.0 0.1 0.0  
Operating Income 33.3 56.8 93.5 138.0  
BSI BioSpin | Intersegment revenue          
Business segment information          
Total segment revenue 0.0 0.0 0.0 0.0  
BSI CALID          
Business segment information          
Total segment revenue 312.7 279.4 878.6 772.9  
Operating expenses:          
Capital Expenditures 7.1 6.5 21.0 18.3  
Depreciation and Amortization 24.0 19.1 67.2 44.2  
BSI CALID | Operating segments          
Business segment information          
Total segment revenue 312.7 279.4 878.6 772.9  
Operating expenses:          
Cost of revenue 130.7 121.9 374.0 327.2  
Selling, general and administrative 75.7 69.9 225.5 196.6  
Research and development 30.3 28.9 88.2 80.9  
Other charges, net 0.0 0.0 0.0 0.0  
Operating Income 76.0 58.7 190.9 168.2  
BSI CALID | Intersegment revenue          
Business segment information          
Total segment revenue 0.0 0.0 0.0 0.0  
BSI Nano          
Business segment information          
Total segment revenue 266.5 287.1 775.2 780.0  
Operating expenses:          
Capital Expenditures 3.1 4.3 21.2 14.4  
Depreciation and Amortization 16.9 17.3 50.7 46.6  
BSI Nano | Operating segments          
Business segment information          
Total segment revenue 266.5 287.1 775.2 780.0  
Operating expenses:          
Cost of revenue 128.7 135.7 373.3 369.5  
Selling, general and administrative 70.2 76.5 212.2 211.2  
Research and development 44.1 44.3 133.7 119.5  
Other charges, net 0.0 0.0 0.0 0.0  
Operating Income 23.5 30.6 56.0 79.8  
BSI Nano | Intersegment revenue          
Business segment information          
Total segment revenue 0.0 0.0 0.0 0.0  
BSI BioSpin, BSI CALID, BSI NANO & Corporate | Operating segments          
Operating expenses:          
Assets 6,287.0   6,287.0   5,648.4
BEST          
Business segment information          
Total segment revenue 72.6 64.9 193.7 200.6  
Operating expenses:          
Capital Expenditures 2.1 4.2 9.3 18.0  
Depreciation and Amortization 2.5 2.3 7.0 6.4  
BEST | Operating segments          
Business segment information          
Total segment revenue 73.8 68.7 199.4 210.9  
Operating expenses:          
Cost of revenue 60.5 54.6 159.2 165.1  
Selling, general and administrative 5.6 5.4 16.6 16.3  
Research and development 0.7 1.0 2.4 3.0  
Other charges, net 0.0 0.0 0.0 0.0  
Operating Income 7.0 7.7 21.2 26.5  
Assets 191.3   191.3   $ 199.8
BEST | Intersegment revenue          
Business segment information          
Total segment revenue 1.2 3.8 5.7 10.3  
Corporate          
Operating expenses:          
Capital Expenditures 1.5 4.2 13.1 11.1  
Depreciation and Amortization 2.2 1.5 5.6 4.3  
Unallocated Expenses          
Operating expenses:          
Operating Income [3] $ 157.6 $ 61.0 $ 287.6 $ 159.4  
[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, goodwill and other long-lived asset impairment charges, and other costs.