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Acquisitions - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended
May 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
acquisition
Sep. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Business Acquisition [Line Items]        
Number of businesses acquired | acquisition   0    
Purchase price, net of cash acquired   $ 8.0 $ 0.0  
Goodwill   $ 3,511.7   $ 3,469.4
AdvisorTarget        
Business Acquisition [Line Items]        
Purchase price, net of cash acquired $ 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 (3.1)      
Acquisition date fair value of contingent consideration liability 14.0      
Goodwill 41.8      
Intangible assets acquired $ 12.1      
Weighted average useful life 5 years