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ACQUISITIONS - Acquisition Summary (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
item
Jun. 30, 2023
USD ($)
item
Mar. 31, 2023
item
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
item
May 31, 2024
item
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]              
Number of acquisitions | item 0 3 0        
Number of other immaterial acquisitions | item   2     2 1  
Goodwill       $ 7,821.9     $ 8,148.2
Payments for merger related costs       3.5      
Acquisition related liabilities and contingent consideration, purchase accounting adjustments       3.5      
Prior year business combinations, net tangible assets adjustments       0.7      
Prior year business combinations, net intangible assets adjustments       1.0      
Prior year business combinations, goodwill adjustments       $ (0.3)      
Weighted average useful lives of definite-lived intangible assets acquired from other acquisitions       9 years 12 years    
Global Institutional and Specialty              
Business Acquisition [Line Items]              
Goodwill       $ 609.6     $ 610.0
Business Acquisitions and Investment              
Business Acquisition [Line Items]              
Net tangible assets (liabilities) acquired   $ 9.4   0.1 $ 9.4    
Identifiable intangible assets   57.3   14.4 57.3    
Goodwill   38.7   22.8 38.7    
Total aggregate purchase price       37.3 105.4    
Acquisition related liabilities and contingent consideration       (2.0) (4.8)    
Net cash paid for acquisitions, including acquisition-related liabilities and contingent consideration       35.3 100.6    
Business Acquisitions and Investment | Customer relationships              
Business Acquisition [Line Items]              
Identifiable intangible assets   35.7   11.0 35.7    
Business Acquisitions and Investment | Trademarks              
Business Acquisition [Line Items]              
Identifiable intangible assets       1.8      
Business Acquisitions and Investment | Other technology              
Business Acquisition [Line Items]              
Identifiable intangible assets   $ 21.6   $ 1.6 $ 21.6