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Collateralized transactions - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) dealer | Dec. 31, 2022 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Bank call loans | $ 0 | $ 0
Customer securities under customer margin loans that are available to be pledged | 1,600,000,000 |
Re-pledged amounts under securities loans agreements | 211,300,000 |
Customer securities pledged directly with the Options Clearing Corporation to secure obligations | 129,200,000 |
Letters of credit outstanding, | 0 |
Amount pledged | $ 689,381,000 | 175,724,000
Number of broker-dealers | dealer | 3 |
Receivable from brokers and clearing organizations | $ 107,600,000 |
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 |
Equity Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of securities received as collateral | $ 151,900,000 | 124,100,000
Equity Securities | Reverse Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of collateral | 8,800,000 | 28,000,000
Equity Securities | 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 | $ 61,500,000 | 39,400,000
Equity Securities | Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of collateral |  | $ 28,000,000

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