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Related Party Transactions - Other Agreements with Cantor (Details) shares in Millions |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2018 shares | Nov. 24, 2018 shares | Nov. 23, 2018 USD ($) shares | Aug. 06, 2018 USD ($) | Jun. 05, 2015 shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 05, 2018 USD ($) | Mar. 19, 2018 USD ($) | Aug. 31, 2013 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions |  |  |  |  |  | $ 1,281,294,000 | $ 1,541,900,000 | $ 1,567,668,000 |  |  |
Limited partnership interest, conversion ratio |  |  |  |  |  | 1 |  |  |  |  |
Common stock, issued during the period, additional consideration |  |  | $ 0 |  |  |  |  |  |  |  |
Interest expense from affiliate |  |  |  |  |  | $ 0 | 0 | 400,000 |  |  |
Cantor |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recognition of share of FX gains (losses) |  |  |  |  |  | 100,000 | 500,000 | 1,500,000 |  |  |
Commissions |  |  |  |  |  | 300,000 | 100,000 | $ 100,000 |  |  |
Investment authorization in asset-backed commercial paper program |  |  |  |  |  |  |  |  |  |  | $ 350,000,000
Securities for reverse repurchase agreements |  |  |  |  |  | 0 | 0 |  |  |  |
Cantor | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  | $ 400,000,000 |  |  |  |  | $ 250,000,000 | $ 250,000,000 |
Debt instrument, extended term |  |  |  | 1 year |  |  |  |  |  |  |
Debt instrument, non-extension notice term |  |  |  | 6 months |  |  |  |  |  |  |
Debt instrument, basis point |  |  |  | 1.00% |  |  |  |  |  |  |
Line of credit facility, borrowing amount |  |  |  |  |  | $ 0 | $ 0 |  |  |  |
CF Group Management, Inc. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange class A to class B common stock (in shares) | shares | 23.6 |  | 0.7 |  | 34.6 |  |  |  |  |  |
Cantor Rights to Purchase Exchangeable Units |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange class A to class B common stock (in shares) | shares |  |  | 10.3 |  |  |  |  |  |  |  |
Cantor Rights to Purchase Exchangeable Units | Maximum |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange class A to class B common stock (in shares) | shares |  |  |  |  | 34.6 |  |  |  |  |  |
Cantor Rights to Purchase Exchangeable Units | Maximum | Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange class A to class B common stock (in shares) | shares |  |  |  |  |  | 23.6 |  |  |  |  |
Cantor and CFGM | Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange class A to class B common stock (in shares) | shares |  | 23.6 |  |  |  |  |  |  |  |  |

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