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Equity Method Investments in Affiliates - Additional Information (Details)
shares in Thousands, $ in Millions
 3 Months Ended 5 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
yr
affiliate
shares
Feb. 15, 2023
shares
Dec. 31, 2022
USD ($)
yr
affiliate
Dec. 31, 2021
USD ($)
yr
affiliate
Dec. 31, 2020
USD ($)
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Number of affiliates accounted for under the equity method | affiliate 20   20 21  
BPEA Transaction gain (Note 10) $ 641.9   $ 641.9 $ 0.0 $ 0.0
EQT AB (“EQT”) | Subsequent Event          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Equity interests issued, shares (in shares) | shares   17,400      
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 | Long-term growth rate          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input 0.05   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 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 | Market participant tax rates          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input 0.25   0.25 0.25  
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