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Equity Method Investments in Affiliates - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
affiliate
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
affiliate
Jun. 30, 2022
USD ($)
Dec. 31, 2022
affiliate
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Number of affiliates | affiliate 20   20   20
Acquired Client Relationships          
Schedule of Equity Method Investments [Line Items]          
Amortization of Intangible Assets     $ 25.0    
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Finite-lived intangible, future amortization expense, remainder of fiscal year $ 25.0   25.0    
Finite-lived intangible, future amortization expense in year one 35.0   35.0    
Finite-lived intangible, future amortization expense in year two 30.0   30.0    
Finite-lived intangible, future amortization expense in year three 30.0   30.0    
Finite-lived intangible, future amortization expense in year four 30.0   30.0    
Finite-lived intangible, future amortization expense in year five 25.0   25.0    
Equity Method Investee | Acquired Client Relationships          
Schedule of Equity Method Investments [Line Items]          
Amortization of Intangible Assets 20.9 $ 34.6 41.8 $ 57.9  
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Finite-lived intangible, future amortization expense, remainder of fiscal year 42.0   42.0    
Finite-lived intangible, future amortization expense in year one 50.0   50.0    
Finite-lived intangible, future amortization expense in year two 50.0   50.0    
Finite-lived intangible, future amortization expense in year three 45.0   45.0    
Finite-lived intangible, future amortization expense in year four 45.0   45.0    
Finite-lived intangible, future amortization expense in year five $ 35.0   $ 35.0