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Goodwill and Acquired Client Relationships - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Intangible assets          
Goodwill impairment   $ 0      
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Cash received in Veritable Transaction $ 287,400,000        
Affiliate Transaction gains $ 133,100,000   $ 0 $ 133,100,000 $ 641,900,000
Third Party          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Subsidiary, ownership percentage, sold 1        
Acquired Client Relationships          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Intangible impairments     0    
Acquired Client Relationships          
Intangible assets          
Amortization and impairment expenses of intangible assets     29,000,000.0 $ 48,300,000 $ 49,100,000
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Intangible future amortization expense in 2025     25,000,000    
Intangible future amortization expense in 2026     25,000,000    
Intangible future amortization expense in 2027     25,000,000    
Intangible future amortization expense in 2028     25,000,000    
Intangible future amortization expense in 2029     15,000,000    
Impairment of definite-lived intangible assets     $ 0