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Collateralized transactions - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) dealer | Dec. 31, 2023 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Bank call loans | $ 94,350,000 | $ 0
Market value of securities | 24,700,000 | 82,300,000
Customer securities under customer margin loans that are available to be pledged | 1,700,000,000 |
Re-pledged amounts under securities loans agreements | 229,000,000 |
Customer securities directly with the Options Clearing Corporation to secure obligations and margin requirements under option contracts written by customers | 32,000,000 |
Outstanding letters of credit | 0 |
Amounts pledged | $ 917,804,000 | 689,381,000
Number of broker-dealers | dealer | 3 |
Receivable from brokers and clearing organizations | $ 97,900,000 |
Minimum |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of business days for related transactions (in days) | 1 day |
Maximum |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of business days for related transactions (in days) | 2 days |
Corporate equities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of securities received as collateral | $ 142,500,000 | 151,900,000
Corporate equities | Reverse Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of collateral | 578,400,000 | 8,800,000
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 | $ 56,700,000 | 61,500,000
Corporate equities | Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of collateral |  | $ 8,800,000

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