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Collateralized transactions - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) dealer | Dec. 31, 2021 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Bank call loans | $ 0 | $ 69,500,000 | [1]
Customer securities under customer margin loans that are available to be pledged | 1,700,000,000 |  |
Re-pledged amounts under securities loans agreements | 268,200,000 |  |
Customer securities directly with the Options Clearing Corporation to secure obligations and margin requirements under option contracts written by customers | 305,900,000 |  |
Outstanding letters of credit | 0 |  |
Amount pledged | $ 175,724,000 | 266,428,000 |
Number of broker-dealers | dealer | 5 |  |
Receivable from brokers and clearing organizations | $ 100,700,000 |  |
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 | $ 124,100,000 | 96,400,000 |
Equity Securities | Reverse Repurchase Agreements |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of collateral | 28,000,000 | 307,300,000 |
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 | $ 39,400,000 | 29,400,000 |
Equity Securities | Repurchase Agreements |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of collateral |  | $ 307,300,000 |
[1] | (1) Certain prior period reported amounts were reclassified to conform to the current period presentation, See Note 2.

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