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Equity Method Investments in Affiliates - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
yr
affiliate
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
yr
affiliate
Jun. 30, 2023
USD ($)
Dec. 31, 2023
affiliate
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Number of affiliates | affiliate 23   23   22
Acquired Client Relationships          
Schedule of Equity Method Investments [Line Items]          
Amortization of Intangible Assets $ 7.3 $ 12.5 $ 14.5 $ 25.0  
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Finite-lived intangible, future amortization expense, remainder of fiscal year 15.0   15.0    
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 $ 20.9 $ 20.9 $ 41.7 $ 41.8  
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Finite-lived intangible, future amortization expense, remainder of fiscal year 41.0   41.0    
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