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Borrowings - Broker-Dealer Credit Facilities Carrying Values, Net (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Line of Credit Facility [Line Items]    
Total principal of long-term borrowings $ 2,068,665,000 $ 1,767,265,000
Deferred Debt Issuance Cost (26,631,000) (23,922,000)
Outstanding Borrowings, net 2,039,490,000 1,740,467,000
Broker-dealer credit facilities    
Line of Credit Facility [Line Items]    
Financing Available 1,060,000,000 1,060,000,000
Total principal of long-term borrowings 125,000,000 10,000,000
Deferred Debt Issuance Cost (3,009,000) 0
Outstanding Borrowings, net $ 121,991,000 $ 10,000,000
Uncommitted facility    
Line of Credit Facility [Line Items]    
Interest Rate 5.25% 5.50%
Financing Available $ 400,000,000 $ 400,000,000
Total principal of long-term borrowings 65,000,000 0
Deferred Debt Issuance Cost 0 0
Outstanding Borrowings, net $ 65,000,000 0
Uncommitted facility | Receivables from broker-dealers and clearing organizations    
Line of Credit Facility [Line Items]    
Deferred Debt Issuance Cost   (300,000)
Committed facility    
Line of Credit Facility [Line Items]    
Interest Rate 5.53%  
Financing Available $ 650,000,000 650,000,000
Total principal of long-term borrowings 50,000,000 0
Deferred Debt Issuance Cost (3,009,000) 0
Outstanding Borrowings, net $ 46,991,000 $ 0
Committed facility | Borrowing Base A Loan    
Line of Credit Facility [Line Items]    
Interest Rate 5.53% 5.75%
Committed facility | Borrowing Base B Loan    
Line of Credit Facility [Line Items]    
Interest Rate 7.00% 7.00%
Outstanding Borrowings, net $ 0 $ 0
Overdraft facility    
Line of Credit Facility [Line Items]    
Interest Rate 7.74% 7.99%
Financing Available $ 10,000,000 $ 10,000,000
Total principal of long-term borrowings 10,000,000 10,000,000
Deferred Debt Issuance Cost 0 0
Outstanding Borrowings, net $ 10,000,000 $ 10,000,000