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Collateralized transactions - Narrative (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) dealer customer | Dec. 31, 2023 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Bank call loans | $ 206,700,000 | $ 0
Market value of securities | 35,700,000 | 197,400,000
Customer securities under customer margin loans that are available to be pledged | 1,800,000,000 |
Re-pledged amounts under securities loans agreements | 203,800,000 |
Customer securities directly with the Options Clearing Corporation to secure obligations and margin requirements under option contracts written by customers | 19,500,000 |
Outstanding letters of credit | 0 |
Amounts pledged | $ 792,284,000 | 689,381,000
Number of broker-dealers | dealer | 4 |
Receivable from brokers and clearing organizations | $ 117,800,000 |
Number of customers | customer | 2 |
Receivable from customers | $ 631,100,000 |
Number of business days for related transactions (in days) | 1 day |
Corporate equities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of securities received as collateral | $ 138,000,000 | 151,900,000
Corporate equities | Reverse Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of collateral | 243,800,000 | 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 | $ 56,500,000 | 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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