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v3.26.1

Collateralized transactions - Narrative (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2026 USD ($) dealer customer | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Bank call loans | $ 287,900,000 | $ 76,800,000 |
Market value of securities | 27,400,000 |  | $ 293,300,000
Customer securities under customer margin loans that are available to be pledged | 2,000,000,000.0 |  |
Re-pledged amounts under securities loans agreements | 275,400,000 |  |
Customer securities directly with the Options Clearing Corporation to secure obligations and margin requirements under option contracts written by customers | 442,800,000 |  |
Outstanding letters of credit | 0 |  |
Amounts pledged | $ 1,172,973,000 | 1,179,503,000 |
Number of broker-dealers | dealer | 2 |  |
Receivable from brokers and clearing organizations | $ 60,400,000 |  |
Number of customers | customer | 2 |  |
Receivable from customers | $ 658,200,000 |  |
Number of business days for related transactions (in days) | 1 day |  |
2 Largest Customers | Accounts Receivable | Customer Concentration Risk |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Concentration risk, percentage | 45.20% |  |
Corporate equities |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of securities received as collateral | $ 158,900,000 | 153,300,000 |
Corporate equities | Reverse Repurchase Agreements |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of collateral | 193,900,000 | 175,800,000 |
Corporate equities | Securities Borrowed Transactions |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of securities received as collateral, sold and re-pledged under securities loaned | $ 43,700,000 | 49,100,000 |
Corporate equities | Repurchase Agreements |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of collateral |  | $ 175,800,000 |

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