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Equity Method Investments in Affiliates - Additional Information (Details)
shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 16, 2022
USD ($)
shares
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
affiliate
Dec. 31, 2016
USD ($)
Estimated Future Amortization Expense of Finite-Lived Intangibles              
Number of affiliates | affiliate           21  
Equity method investments   $ 103.0   $ 103.0   $ 111.4  
Baring Private Equity Asia (“BPEA”)              
Estimated Future Amortization Expense of Finite-Lived Intangibles              
Equity method investments   135.3   135.3     $ 187.5
Baring Private Equity Asia (“BPEA”) | EQT AB (“EQT”)              
Estimated Future Amortization Expense of Finite-Lived Intangibles              
Expected cash proceeds $ 240.0            
Expected equity interest issuable, number of shares (in shares) | shares 28,680            
Percentage of shares restricted 0.25            
Term of restricted shares 6 years            
Acquired Client Relationships              
Schedule of Equity Method Investments [Line Items]              
Amortization of Intangible Assets       24.7      
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   50.0   50.0      
Finite-lived intangible, future amortization expense in year two   35.0   35.0      
Finite-lived intangible, future amortization expense in year three   35.0   35.0      
Finite-lived intangible, future amortization expense in year four   35.0   35.0      
Finite-lived intangible, future amortization expense in year five   35.0   35.0      
Equity Method Investee | Acquired Client Relationships              
Schedule of Equity Method Investments [Line Items]              
Amortization of Intangible Assets   34.6 $ 29.3 57.9 $ 64.5    
Estimated Future Amortization Expense of Finite-Lived Intangibles              
Finite-lived intangible, future amortization expense, remainder of fiscal year   45.0   45.0      
Finite-lived intangible, future amortization expense in year one   80.0   80.0      
Finite-lived intangible, future amortization expense in year two   50.0   50.0      
Finite-lived intangible, future amortization expense in year three   50.0   50.0      
Finite-lived intangible, future amortization expense in year four   $ 40.0   $ 40.0