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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 01, 2024
May 31, 2024
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2024
Business Acquisition [Line Items]            
Cash payments       $ 193.5 $ 0.0  
Goodwill       3,494.9   $ 3,469.4
SIS            
Business Acquisition [Line Items]            
Weighted average useful life 10 years          
Aggregate purchase price       185.5    
Cash payments       185.5    
Net tangible liabilities assumed       1.9    
Goodwill       38.3    
Intangible assets       $ 149.1    
2024 Immaterial Acquisition            
Business Acquisition [Line Items]            
Aggregate purchase price     $ 8.0      
AdvisorTarget            
Business Acquisition [Line Items]            
Weighted average useful life   5 years        
Cash payments   $ 34.3        
Deferred payments   1.0        
Settlement of pre existing relationship   1.6        
Contingent consideration maximum potential pay out   30.5        
Net tangible liabilities assumed   (3.3)        
Acquisition date fair value of contingent consideration liability   14.0        
Goodwill   42.0        
Intangible assets   $ 12.1