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Equity Method Investments in Affiliates - Additional Information (Details)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 03, 2025
USD ($)
Jul. 31, 2025
USD ($)
shares
Sep. 30, 2025
USD ($)
affiliate
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
yr
Sep. 30, 2025
USD ($)
affiliate
Sep. 30, 2024
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2024
USD ($)
affiliate
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Number of affiliates | affiliate     23     23     22
Affiliate transaction gains     $ 127.6 $ 0.0   $ 127.6 $ 0.0    
Equity method investments     118.3     118.3     $ 111.4
Peppertree Capital Management | TPG Inc.                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Sale of equity interests, total consideration   $ 253.2              
Sale of equity interests, cash proceeds   $ 99.8              
Sale of equity interests, equity interests issuable, number of shares (in shares) | shares   2.9              
Affiliate transaction gains   $ 127.6              
Sale of equity, after-tax net proceeds   $ 218.1              
Comvest Partners                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Acquisition of equity method investments               $ 125.0  
Equity method investments     121.8     121.8      
Comvest Partners | Subsequent Event                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Proceeds from sale of equity method investments $ 285.0                
Acquired Client Relationships                  
Schedule of Equity Method Investments [Line Items]                  
Amortization of intangible assets     6.3 7.3   19.0 21.8    
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Finite-lived intangible, future amortization expense, remainder of fiscal year     6.0     6.0      
Finite-lived intangible, future amortization expense in year one     25.0     25.0      
Finite-lived intangible, future amortization expense in year two     25.0     25.0      
Finite-lived intangible, future amortization expense in year three     25.0     25.0      
Finite-lived intangible, future amortization expense in year four     15.0     15.0      
Finite-lived intangible, future amortization expense in year five     10.0     10.0      
Equity Method Investee                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Impairment expense         $ 39.9        
Equity Method Investee | Measurement Input, Growth Rate Period                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Equity method investment, measurement input | yr         10        
Equity Method Investee | Measurement Input, Growth Rate                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Equity method investment, measurement input         (0.025)        
Equity Method Investee | Measurement Input, Long-Term Growth Rate                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Equity method investment, measurement input         0.03        
Equity Method Investee | Measurement Input, Discount Rate, Asset Based Fees                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Equity method investment, measurement input         0.12        
Equity Method Investee | Measurement Input, Discount Rate, Performance Based Fees                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Equity method investment, measurement input         0.20        
Equity Method Investee | Measurement Input, Market Participant Tax Rates                  
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Equity method investment, measurement input         0.21        
Equity Method Investee | Acquired Client Relationships                  
Schedule of Equity Method Investments [Line Items]                  
Amortization of intangible assets     24.6 $ 22.7   70.2 $ 64.4    
Estimated Future Amortization Expense of Finite-Lived Intangibles                  
Finite-lived intangible, future amortization expense, remainder of fiscal year     23.0     23.0      
Finite-lived intangible, future amortization expense in year one     85.0     85.0      
Finite-lived intangible, future amortization expense in year two     85.0     85.0      
Finite-lived intangible, future amortization expense in year three     75.0     75.0      
Finite-lived intangible, future amortization expense in year four     60.0     60.0      
Finite-lived intangible, future amortization expense in year five     $ 60.0     $ 60.0