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Compensation Plans - Deferred Compensation Plans (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Apr. 03, 2020
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Oct. 07, 2022
Feb. 04, 2022
Aug. 02, 2019
DBO Partners | Net revenue target                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Maximum amount of contingent consideration             $ 25,000,000.0    
DBO Partners | Net revenue target | No service requirement                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Contingent consideration         $ 0        
Expense recorded related to earnout           $ (1,700,000)      
Cornerstone Macro | Net revenue target                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Maximum amount of contingent consideration               $ 27,800,000  
Cornerstone Macro | Net revenue target | No service requirement                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Maximum amount of contingent consideration               $ 6,000,000.0  
Amount paid related to contingent consideration liability         6,000,000.0        
Cornerstone Macro | Net revenue target | Service requirement                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Maximum amount of contingent consideration       $ 5,200,000          
Contingent consideration       1,800,000          
Expense recorded related to earnout       1,000,000.0 1,900,000        
Cornerstone Macro | Net revenue target | Service requirement | Second Quarter 2026                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Maximum amount of contingent consideration       $ 2,600,000          
Cornerstone Macro | Net revenue target | Service requirement | Second Quarter 2025                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Amount paid related to contingent consideration liability     $ 2,600,000            
TRS Advisors LLC | Revenue threshold                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Amount paid related to contingent consideration liability         7,000,000.0        
Expense recorded related to earnout         500,000 2,200,000      
Earnout performance period (in years) 3 years                
The Valence Group | Revenue threshold                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Amount paid related to contingent consideration liability           10,000,000.0      
Expense recorded related to earnout           2,200,000      
Earnout performance period (in years)   3 years              
Weeden & Co. | Restricted cash                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Acquisition-related compensation arrangements                 $ 10,100,000
Annual MFRS Awards | Minimum                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Award Vesting Period       3 years          
Annual MFRS Awards | Maximum                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Award Vesting Period       4 years          
Retention MFRS Awards | Minimum                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Award Vesting Period       3 years          
Retention MFRS Awards | Maximum                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Award Vesting Period       5 years          
Nonqualified Deferred Compensation Plan                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Plan Liabilities       $ 19,300,000 22,000,000.0        
Nonqualified Deferred Compensation Plan | Level I                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Plan Assets       19,300,000 22,000,000.0        
Mutual Fund Restricted Shares                  
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits                  
Deferred Compensation Arrangement with Individual, Compensation Expense       153,100,000 82,300,000 75,400,000      
Shares Granted, Value, Share-Based Payment Arrangement, Forfeited       $ 4,600,000 $ 4,400,000 $ 1,300,000