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Revenues from Contracts with Customers - Schedule of Revenues from Contracts with Customers and Other Sources of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenues From Contracts With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 620,786 | $ 448,850 | $ 1,803,397 | $ 1,337,434
Principal transactions | 99,951 | 93,551 | 336,432 | 304,839
Interest and dividend income | 14,039 | 16,944 | 40,936 | 43,853
Other revenues | 2,073 | 1,766 | 4,328 | 4,360
Total revenues | 736,849 | 561,111 | 2,185,093 | 1,690,486
Commissions |  |  |  |
Revenues From Contracts With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers | 573,159 | 407,095 | 1,667,366 | 1,217,348
Data, network and post-trade |  |  |  |
Revenues From Contracts With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers | 34,349 | 32,661 | 102,311 | 94,376
Fees from related parties |  |  |  |
Revenues From Contracts With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers | 4,453 | 5,106 | 14,116 | 14,170
Other revenues |  |  |  |
Revenues From Contracts With Customers [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 8,825 | $ 3,988 | $ 19,604 | $ 11,540

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-21 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 45 -Paragraph 39 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477346/946-830-45-39 + Details
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