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Equity Method Investments in Affiliates - Additional Information (Details)
shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2024
USD ($)
yr
affiliate
Dec. 31, 2023
USD ($)
affiliate
Dec. 31, 2022
USD ($)
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Number of affiliates accounted for under the equity method | affiliate     22 22  
BPEA Transaction gain   $ 641.9      
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     $ 29.0 $ 48.3 $ 49.1
Estimated Future Amortization Expense of Finite-Lived Intangibles          
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    
Intangible future amortization expense in 2029     $ 15.0    
Equity Method Investee          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Impairment expense $ 39.9     9.6  
Equity Method Investee | Growth rate period          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input | yr     10    
Equity Method Investee | Growth rate          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input     (0.025)    
Equity Method Investee | Long-term growth rate          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input     0.03    
Equity Method Investee | Discount rates, asset based fees          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input     0.12    
Equity Method Investee | Discount rates, performance based fees          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input     0.20    
Equity Method Investee | Market participant tax rates          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Measurement input     0.21    
Equity Method Investee | Acquired Client Relationships          
Schedule of Equity Method Investments [Line Items]          
Intangible amortization expense     $ 90.1 $ 86.0 $ 109.1
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Intangible future amortization expense in 2025     75.0    
Intangible future amortization expense in 2026     70.0    
Intangible future amortization expense in 2027     70.0    
Intangible future amortization expense in 2028     60.0    
Intangible future amortization expense in 2029     $ 45.0