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Intangible Assets (Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Intangible Assets [Line Items]    
Total intangible assets $ 3,330,788 $ 1,482,988
Definite-lived intangibles, net(1):    
Gross  Carrying  Value 4,541,590 2,462,816
 Accumulated Amortization (1,250,621) (1,019,647)
Net  Carrying  Value 3,290,969 1,443,169
Indefinite-lived intangible assets:    
Purchase accounting adjustments $ 497,885 333,205
Trademark and trade name    
Intangible Assets [Line Items]    
Weighted-Average Life  Remaining (in years) 15 years 7 months 6 days  
Definite-lived intangibles, net(1):    
Gross  Carrying  Value $ 26,000  
 Accumulated Amortization (677)  
Net  Carrying  Value 25,323  
Indefinite-lived intangible assets:    
Net  Carrying  Value $ 39,819 $ 39,819
Advisor and institution relationships    
Intangible Assets [Line Items]    
Weighted-Average Life  Remaining (in years) 13 years 7 months 6 days 13 years 4 months 24 days
Definite-lived intangibles, net(1):    
Gross  Carrying  Value $ 3,350,706 $ 1,626,281
 Accumulated Amortization (859,100) (699,385)
Net  Carrying  Value $ 2,491,606 $ 926,896
Product sponsor relationships    
Intangible Assets [Line Items]    
Weighted-Average Life  Remaining (in years) 1 year 2 months 12 days 1 year 3 months 18 days
Definite-lived intangibles, net(1):    
Gross  Carrying  Value $ 234,086 $ 234,086
 Accumulated Amortization (232,362) (220,880)
Net  Carrying  Value $ 1,724 $ 13,206
Client relationships    
Intangible Assets [Line Items]    
Weighted-Average Life  Remaining (in years) 12 years 3 months 18 days 12 years 8 months 12 days
Definite-lived intangibles, net(1):    
Gross  Carrying  Value $ 909,868 $ 581,519
 Accumulated Amortization (143,039) (86,292)
Net  Carrying  Value $ 766,829 $ 495,227
Technology    
Intangible Assets [Line Items]    
Weighted-Average Life  Remaining (in years) 3 years 7 years 7 months 6 days
Definite-lived intangibles, net(1):    
Gross  Carrying  Value $ 20,930 $ 20,930
 Accumulated Amortization (15,443) (13,090)
Net  Carrying  Value $ 5,487 $ 7,840