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Equity Method Investments in Affiliates - Additional Information (Details)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 16, 2022
USD ($)
shares
Mar. 31, 2022
USD ($)
affiliate
Mar. 31, 2021
USD ($)
affiliate
Dec. 31, 2021
USD ($)
Dec. 31, 2016
USD ($)
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Number of affiliates accounted for under the equity method | affiliate   21 19    
Equity method investments   $ 105.3   $ 111.4  
Baring Private Equity Asia (“BPEA”)          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Equity method investments   138.0     $ 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 months        
Acquired Client Relationships          
Schedule of Equity Method Investments [Line Items]          
Amortization of Intangible Assets   12.3      
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Finite-lived intangible, future amortization expense, remainder of fiscal year   40.0      
Finite-lived intangible, future amortization expense in year one   50.0      
Finite-lived intangible, future amortization expense in year two   35.0      
Finite-lived intangible, future amortization expense in year three   35.0      
Finite-lived intangible, future amortization expense in year four   35.0      
Finite-lived intangible, future amortization expense in year five   35.0      
Equity Method Investee          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Total contingent payments   83.3      
Equity Method Investee | Acquired Client Relationships          
Schedule of Equity Method Investments [Line Items]          
Amortization of Intangible Assets   23.3 $ 35.2    
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Finite-lived intangible, future amortization expense, remainder of fiscal year   70.0      
Finite-lived intangible, future amortization expense in year one   85.0      
Finite-lived intangible, future amortization expense in year two   50.0      
Finite-lived intangible, future amortization expense in year three   50.0      
Finite-lived intangible, future amortization expense in year four   45.0      
Finite-lived intangible, future amortization expense in year five   $ 40.0