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Borrowings - Broker-Dealer Credit Facilities Carrying Values, Net (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Total principal of long-term borrowings | $ 2,067,334,000 | $ 1,767,265,000
Deferred Debt Issuance Cost | (25,439,000) | (23,922,000)
Outstanding Borrowings, net | 2,039,463,000 | 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 | 10,000,000 | 10,000,000
Deferred Debt Issuance Cost | 0 | 0
Outstanding Borrowings, net | $ 10,000,000 | $ 10,000,000
Uncommitted facility |  |
Line of Credit Facility [Line Items] |  |
Interest Rate | 4.81% | 5.50%
Financing Available | $ 400,000,000 | $ 400,000,000
Total principal of long-term borrowings | 0 | 0
Deferred Debt Issuance Cost | 0 | 0
Outstanding Borrowings, net | 0 | 0
Uncommitted facility | Receivables from broker-dealers and clearing organizations |  |
Line of Credit Facility [Line Items] |  |
Deferred Debt Issuance Cost | $ (2,500,000) | (300,000)
Committed facility |  |
Line of Credit Facility [Line Items] |  |
Interest Rate | 5.09% |
Financing Available | $ 650,000,000 | 650,000,000
Total principal of long-term borrowings | 0 | 0
Deferred Debt Issuance Cost | 0 | 0
Outstanding Borrowings, net | $ 0 | $ 0
Committed facility | Borrowing Base A Loan |  |
Line of Credit Facility [Line Items] |  |
Interest Rate | 5.09% | 5.75%
Committed facility | Borrowing Base B Loan |  |
Line of Credit Facility [Line Items] |  |
Interest Rate | 6.58% | 7.00%
Outstanding Borrowings, net | $ 0 | $ 0
Overdraft facility |  |
Line of Credit Facility [Line Items] |  |
Interest Rate | 7.37% | 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

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D + Details
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