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Goodwill and Acquired Client Relationships - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Impairment assessment assumptions, long-term revenue growth rates   0.00%        
Impairment assessment assumptions, discount rates   11.00%        
Acquired Client Relationships            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Intangible impairment       $ 77.0    
Carrying value of intangible assets $ 1,548.6     1,548.6   $ 1,597.5
Acquired Client Relationships For Certain Mutual Fund Assets            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Amortization of intangible assets, noncontrolling interest   $ 59.2        
Intangible impairment   70.0        
Acquired Client Relationships, Mutual Fund Product            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Amortization of intangible assets, noncontrolling interest   4.0        
Intangible impairment   7.0        
Carrying value of intangible assets   $ 0.0        
Minimum            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Impairment assessment assumptions, revenue growth rates   (21.00%)        
Maximum            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Impairment assessment assumptions, revenue growth rates   0.00%        
Acquired Client Relationships            
Intangible Assets            
Amortization and impairment expenses of intangible assets 6.3   $ 7.3 12.6 $ 14.5  
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Finite-lived intangible, future amortization expense, remainder of fiscal year 13.0     13.0    
Finite-lived intangible, future amortization expense in year one 25.0     25.0    
Finite-lived intangible, future amortization expense in year two 25.0     25.0    
Finite-lived intangible, future amortization expense in year three 25.0     25.0    
Finite-lived intangible, future amortization expense in year four 15.0     15.0    
Finite-lived intangible, future amortization expense in year five $ 10.0     $ 10.0