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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]      
Goodwill $ 6,789.5 $ 6,369.7 $ 6,142.5
Goodwill, Acquired During Period 287.8 390.5 296.9
Adjustments to goodwill 132.0 (163.3)  
Goodwill, Impairment Loss (0.0)    
Net Carrying Amount 3,596.0 3,488.9  
Goodwill Impairment, Cumulative 648.5 648.5  
Gross Carrying Amount 5,327.5 4,875.8  
Accumulated Amortization (2,290.7) (1,944.4)  
Finite-Lived Intangible Assets, Net 3,036.8 2,931.4  
Gross Carrying Amount 5,886.7 5,433.3  
Goodwill [Roll Forward]      
Balance as of January 1 6,369.7 6,142.5  
Adjustments to goodwill 132.0 (163.3)  
Goodwill, net 6,789.5 6,369.7 6,142.5
Asset Impairment Charges 4.3 5.3 349.0
Goodwill and other asset impairments   0.0  
Licensing Agreements [Member]      
Goodwill [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) 559.2 557.5  
Customer Relationships [Member]      
Goodwill [Line Items]      
Gross Carrying Amount 4,525.3 4,114.7  
Accumulated Amortization (1,816.3) (1,540.7)  
Finite-Lived Intangible Assets, Net 2,709.0 2,574.0  
Patents, Licenses And Technology [Member]      
Goodwill [Line Items]      
Gross Carrying Amount 548.7 541.0  
Accumulated Amortization (337.5) (298.3)  
Finite-Lived Intangible Assets, Net 211.2 242.7  
Non-compete agreements [Member]      
Goodwill [Line Items]      
Gross Carrying Amount 213.5 180.2  
Accumulated Amortization (108.0) (83.9)  
Finite-Lived Intangible Assets, Net 105.5 96.3  
Other      
Goodwill [Line Items]      
Gross Carrying Amount 40.0 39.9  
Accumulated Amortization (28.9) (21.5)  
Finite-Lived Intangible Assets, Net 11.1 18.4  
Diagnostics [Member]      
Goodwill [Line Items]      
Goodwill 5,434.8 5,102.5 4,813.9
Goodwill, Acquired During Period 287.8 390.5  
Adjustments to goodwill 44.5 (101.9)  
Goodwill [Roll Forward]      
Balance as of January 1 5,102.5 4,813.9  
Adjustments to goodwill 44.5 (101.9)  
Goodwill, net 5,434.8 5,102.5 4,813.9
Biopharma Laboratory Services      
Goodwill [Line Items]      
Goodwill 1,354.7 1,267.2 1,328.6
Goodwill, Acquired During Period 0.0 0.0  
Adjustments to goodwill 87.5 (61.4)  
Goodwill [Roll Forward]      
Balance as of January 1 1,267.2 1,328.6  
Adjustments to goodwill 87.5 (61.4)  
Goodwill, net $ 1,354.7 $ 1,267.2 $ 1,328.6