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Goodwill and Acquired Client Relationships - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Intangible Assets          
Goodwill impairment       $ 0  
Acquired Client Relationships          
Intangible Assets          
Amortization and impairment expenses of intangible assets       62,700,000  
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Finite-lived intangible, future amortization expense in 2020 $ 10,000,000     10,000,000  
Finite-lived intangible, future amortization expense in 2021 30,000,000     30,000,000  
Finite-lived intangible, future amortization expense in 2022 30,000,000     30,000,000  
Finite-lived intangible, future amortization expense in 2023 30,000,000     30,000,000  
Finite-lived intangible, future amortization expense in 2024 20,000,000     20,000,000  
Finite-lived intangible, future amortization expense in 2025 10,000,000     10,000,000  
Intangible impairments $ 14,000,000.0 $ 60,300,000   70,700,000  
Average projected growth rate (14.00%)        
Discount rate for assets based fees 15.00%        
Market participant tax rate 25.00%        
Acquired Client Relationships | Closure of Certain Retail Investment Products          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Intangible impairments $ 10,900,000        
Acquired Client Relationships | Intangible amortization and impairments          
Intangible Assets          
Amortization and impairment expenses of intangible assets 7,000,000.0   $ 21,100,000 $ 48,200,000 $ 72,000,000.0
Controlling Interest | Acquired Client Relationships          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Intangible impairments 12,500,000 $ 32,800,000      
Controlling Interest | Acquired Client Relationships | Closure of Certain Retail Investment Products          
Estimated Future Amortization Expense of Finite-Lived Intangibles          
Intangible impairments $ 7,400,000