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Stock Transactions and Unit Purchases - Schedule of Share Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 16, 2025 | Dec. 31, 2025 | Nov. 30, 2025 | Oct. 31, 2025 | Jun. 30, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Nov. 04, 2024
Class of Stock |  |  |  |  |  |  |  |  |
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the Program |  |  |  |  |  |  |  |  | $ 400,000
Mr. Lutnick |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Average Price Paid per Share (in dollars per share) | $ 11.58 |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Share Repurchases, Total Number of Shares Repurchased (in shares) |  | 0 | 0 | 134,259 | 10,839,674 | 10,973,933 | 17,729,096 | 5,785,370 |
Average Price Paid per Share (in dollars per share) |  | $ 0 | $ 0 | $ 11.50 | $ 11.58 | $ 11.58 | $ 11.99 |  |
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the Program |  | $ 244,852 |  |  |  | $ 244,852 |  |  |
Class A Common Stock | Howard W. Lutnick, Spouse and Trusts | Mr. Lutnick |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |
Share Repurchases, Total Number of Shares Repurchased (in shares) | 11,000,000.0 |  |  |  |  |  |  |  |

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