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Equity Method Investments in Affiliates - Additional Information (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
affiliate
Mar. 31, 2023
USD ($)
Dec. 31, 2023
affiliate
Estimated Future Amortization Expense of Finite-Lived Intangibles      
Number of affiliates accounted for under the equity method | affiliate 22   22
Acquired Client Relationships      
Schedule of Equity Method Investments [Line Items]      
Amortization of Intangible Assets $ 7.3    
Estimated Future Amortization Expense of Finite-Lived Intangibles      
Finite-lived intangible, future amortization expense, remainder of fiscal year 22.0    
Finite-lived intangible, future amortization expense in year five 13.0    
Equity Method Investee | Acquired Client Relationships      
Schedule of Equity Method Investments [Line Items]      
Amortization of Intangible Assets 20.8 $ 20.9  
Estimated Future Amortization Expense of Finite-Lived Intangibles      
Finite-lived intangible, future amortization expense, remainder of fiscal year 62.0    
Finite-lived intangible, future amortization expense in year one 77.0    
Finite-lived intangible, future amortization expense in year two 73.0    
Finite-lived intangible, future amortization expense in year three 73.0    
Finite-lived intangible, future amortization expense in year four 65.0    
Finite-lived intangible, future amortization expense in year five $ 50.0