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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 ($)
yr
affiliate
shares
Dec. 31, 2023
USD ($)
affiliate
Dec. 31, 2022
USD ($)
yr
affiliate
Dec. 31, 2021
USD ($)
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Number of affiliates accounted for under the equity method | affiliate 20 22 20  
BPEA Transaction gain $ 641.9 $ 133.1 $ 641.9 $ 0.0
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   48.3 49.1  
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Intangible future amortization expense in 2024   30.0    
Intangible future amortization expense in 2025   25.0    
Intangible future amortization expense in 2026   25.0    
Intangible future amortization expense in 2027   25.0    
Intangible future amortization expense in 2028   25.0    
Equity Method Investee        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Impairment expense   9.6 $ 50.0  
Equity Method Investee | Growth rate period        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input | yr 5   5  
Equity Method Investee | Growth rate        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 0.02   0.02  
Equity Method Investee | Long-term growth rate        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 0.05   0.05  
Equity Method Investee | Discount rates, asset based fees        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 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  
Equity Method Investee | Market participant tax rates        
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Measurement input 0.25   0.25  
Equity Method Investee | Acquired Client Relationships        
Schedule of Equity Method Investments [Line Items]        
Intangible amortization expense   86.0 $ 109.1 $ 123.0
Estimated Future Amortization Expense of Finite-Lived Intangibles        
Intangible future amortization expense in 2024   65.0    
Intangible future amortization expense in 2025   62.0    
Intangible future amortization expense in 2026   55.0    
Intangible future amortization expense in 2027   55.0    
Intangible future amortization expense in 2028   $ 50.0