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Equity Method Investments in Affiliates - Additional Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
yr
affiliate
Jun. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
yr
affiliate
Sep. 30, 2023
USD ($)
Dec. 31, 2023
affiliate
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Number of affiliates | affiliate 22     22   22
Acquired Client Relationships            
Schedule of Equity Method Investments [Line Items]            
Amortization of intangible assets $ 7.3   $ 12.5 $ 21.8 $ 37.5  
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Finite-lived intangible, future amortization expense, remainder of fiscal year 7.0     7.0    
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 25.0     25.0    
Finite-lived intangible, future amortization expense in year five $ 15.0     $ 15.0    
Equity Method Investee            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Impairment expense   $ 39.9        
Equity Method Investee | Measurement Input, Growth Rate Period            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Equity method investment, measurement input | yr 10     10    
Equity Method Investee | Measurement Input, Growth Rate            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Equity method investment, measurement input (0.025)     (0.025)    
Equity Method Investee | Measurement Input, Long-Term Growth Rate            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Equity method investment, measurement input 0.03     0.03    
Equity Method Investee | Measurement Input, Discount Rate, Asset Based Fees            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Equity method investment, measurement input 0.12     0.12    
Equity Method Investee | Measurement Input, Discount Rate, Performance Based Fees            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Equity method investment, measurement input 0.20     0.20    
Equity Method Investee | Measurement Input, Market Participant Tax Rates            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Equity method investment, measurement input 0.21     0.21    
Equity Method Investee | Acquired Client Relationships            
Schedule of Equity Method Investments [Line Items]            
Amortization of intangible assets $ 22.7   $ 21.2 $ 64.4 $ 63.0  
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Finite-lived intangible, future amortization expense, remainder of fiscal year 23.0     23.0    
Finite-lived intangible, future amortization expense in year one 75.0     75.0    
Finite-lived intangible, future amortization expense in year two 70.0     70.0    
Finite-lived intangible, future amortization expense in year three 70.0     70.0    
Finite-lived intangible, future amortization expense in year four 60.0     60.0    
Finite-lived intangible, future amortization expense in year five $ 45.0     $ 45.0