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Goodwill and Acquired Client Relationships - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Intangible Assets      
Impairment assessment assumptions, long-term revenue growth rates 0.00%    
Impairment assessment assumptions, discount rates 11.00%    
Acquired Client Relationships      
Intangible Assets      
Intangible impairment $ 77.0    
Carrying value of intangible assets 1,530.0   $ 1,597.5
Acquired Client Relationships For Certain Mutual Fund Assets      
Intangible Assets      
Amortization of intangible assets, noncontrolling interest 59.2    
Intangible impairment 70.0    
Acquired Client Relationships, Mutual Fund Product      
Intangible Assets      
Amortization of intangible assets, noncontrolling interest 4.0    
Intangible impairment 7.0    
Carrying value of intangible assets $ 0.0    
Minimum      
Intangible Assets      
Impairment assessment assumptions, revenue growth rates (21.00%)    
Maximum      
Intangible Assets      
Impairment assessment assumptions, revenue growth rates 0.00%    
Acquired Client Relationships      
Intangible Assets      
Amortization and impairment expenses of intangible assets $ 6.3 $ 7.3  
Estimated Future Amortization Expense of Finite-Lived Intangibles      
Finite-lived intangible, future amortization expense, remainder of fiscal year 20.0    
Finite-lived intangible, future amortization expense in year one 25.0    
Finite-lived intangible, future amortization expense in year two 25.0    
Finite-lived intangible, future amortization expense in year three 25.0    
Finite-lived intangible, future amortization expense in year four 15.0    
Finite-lived intangible, future amortization expense in year five $ 10.0