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Equity Method Investments in Affiliates - Additional Information (Details)
shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
yr
affiliate
shares
Dec. 31, 2022
USD ($)
yr
affiliate
Dec. 31, 2021
USD ($)
yr
affiliate
Dec. 31, 2020
USD ($)
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Deferred payment obligations payable in 2022 $ 21.7 $ 21.7    
Contingent payment obligation $ 461.7 $ 461.7 $ 709.2  
Number of affiliates accounted for under the equity method | affiliate 20 20 21  
Equity method investments $ 87.9 $ 87.9 $ 111.4  
Baring Private Equity Asia (“BPEA”) | EQT AB (“EQT”)        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Merger agreement, cash proceeds $ 223.6      
Merger agreement, equity interests 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]        
Intangible amortization expense   49.1 35.7  
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Intangible future amortization expense in 2023 $ 50.0 50.0    
Intangible future amortization expense in 2024 35.0 35.0    
Intangible future amortization expense in 2025 30.0 30.0    
Intangible future amortization expense in 2026 30.0 30.0    
Intangible future amortization expense in 2027 $ 30.0 30.0    
Equity Method Investee        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Impairment expense   $ 50.0 $ 52.0  
Equity Method Investee | Growth rate period        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input | yr 5 5 5  
Equity Method Investee | Growth rate        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 0.02 0.02 0.003  
Equity Method Investee | Market participant tax rates        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 0.25 0.25 0.25  
Equity Method Investee | Discount rates, asset based fees        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 0.11 0.11 0.11  
Equity Method Investee | Discount rates, performance based fees        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 0.20 0.20 0.20  
Equity Method Investee | Acquired Client Relationships        
Schedule of Equity Method Investments [Line Items]        
Intangible amortization expense   $ 109.1 $ 123.0 $ 147.0
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Intangible future amortization expense in 2023 $ 85.0 85.0    
Intangible future amortization expense in 2024 55.0 55.0    
Intangible future amortization expense in 2025 50.0 50.0    
Intangible future amortization expense in 2026 45.0 45.0    
Intangible future amortization expense in 2027 $ 45.0 $ 45.0