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Collateralized transactions - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) dealer customer | Dec. 31, 2023 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Bank call loans | $ 252,100,000 | $ 0
Market value of securities | 43,000,000 | 238,400,000
Customer securities under customer margin loans that are available to be pledged | 1,900,000,000 |
Re-pledged amounts under securities loans agreements | 187,500,000 |
Customer securities pledged directly with the Options Clearing Corporation to secure obligations | 228,300,000 |
Letters of credit outstanding, | 0 |
Amount pledged | $ 1,015,604,000 | 689,381,000
Number of broker-dealers | dealer | 3 |
Receivable from brokers and clearing organizations | $ 82,900,000 |
Number of customers | customer | 2 |
Receivable from customers | $ 666,100,000 |
Number of business days for related transactions (in days) | 1 day |
Accounts Receivable | Customer Concentration Risk | 2 Largest Customers |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of margin loans | 52.00% |
Equity Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of securities received as collateral | $ 131,700,000 | 151,900,000
Equity Securities | Reverse Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of collateral | 68,100,000 | 8,800,000
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 | $ 39,200,000 | 61,500,000
Equity Securities | Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of collateral |  | $ 8,800,000

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