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CREDIT LOSSES | 12 Months Ended
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Dec. 31, 2025
Credit Loss [Abstract] |
CREDIT LOSSES | CREDIT LOSSES Current expected credit losses are estimated for accounts receivable and certain notes receivable. Accounts receivable represent amounts due from the Company’s member firms. The allowance for accounts receivable credit losses is calculated using an aging schedule. The allowance for notes receivable credit losses is associated with notes receivable included within other assets, net on the consolidated balance sheets and relates to promissory notes to fund the implementation and operation of the CAT, a portion of which notes are expected to be repaid by Consolidated Audit Trail, LLC (“CATLLC”). CAT involves the creation, implementation, and maintenance of an audit trail that is required by Rule 613 under the Exchange Act (“Rule 613”), and it strives to enhance regulators’ ability to monitor trading activity in the U.S. national securities markets. CATLLC is a national market system (“NMS”) plan that was created by self-regulatory organizations that include the Cboe U.S. national securities exchanges, the other U.S. national securities exchanges, and FINRA (who collectively are referred to as the “Plan Participants”) to implement and operate the CAT. On September 6, 2023, the SEC issued an order approving an amendment to the CAT Plan to implement a revised funding model (“CAT Funding Model”) for CATLLC to fund the CAT. The CAT Funding Model contemplated two categories of CAT fees calculated based on the “executed equivalent shares” of transactions in eligible securities: (i) CAT fees assessed by CATLLC to Industry Members who are CAT Executing Brokers (the brokers responsible for executing each side of the transaction) to recover a portion of historical CAT costs previously funded by monies loaned to CATLLC by the Plan Participants; and (ii) CAT fees assessed by CATLLC to CAT Executing Brokers and Plan Participants to fund prospective CAT costs. On October 17, 2023, Citadel Securities, LLC, and the American Securities Association filed a petition for review of the CAT Funding Model in the U.S. Court of Appeals for the 11th Circuit ("11th Circuit"). The 11th Circuit vacated the CAT Funding Model order in July 2025. After the CAT Funding Model order was vacated and the 11th Circuit's order became effective at the end of November 2025, CATLLC could no longer collect the fees that it previously collected. There is currently no funding model in place for CATLLC to fund the CAT. However, on September 5, 2025, CATLLC filed with the SEC a proposed amendment to the CAT Plan to implement a revised funding model for CATLLC to fund the CAT, which proposal is currently pending with the SEC. If the SEC does not approve this proposal for a revised funding model, or any other funding mechanism for CATLLC, the Plan Participants may continue to incur additional significant costs related to the historical, current, and future funding of the implementation and operation of the CAT, and/or it may result in them not being able to collect on the promissory notes related to the funding of the implementation and operation of the CAT. The Company plans to continue to explore potential applicable avenues to recoup historical and potential future CAT costs if the SEC does not approve the pending proposed funding model or other funding mechanism, and to reduce the costs of operating the CAT while maintaining core regulatory functionality. The allowance for notes receivable credit losses associated with the CAT is calculated using a methodology that is primarily based on the structure of the notes and various potential outcomes under the CAT Funding Model. See Note 23 ("Commitments, Contingencies, and Guarantees") for more information. The following represents the changes in allowance for credit losses during the years ended December 31, 2025 and 2024 (in millions):
| Allowance for notes receivable credit losses |  | Allowance for accounts receivable credit losses |  | Total allowance for credit losses
Balance at December 31, 2023 | $ | 30.1 |  |  | $ | 4.5 |  |  | $ | 34.6 |
Current period provision for expected credit losses | — |  |  | 3.1 |  |  | 3.1 |
Write-offs charged against the allowance | — |  |  | (0.7) |  |  | (0.7) |
Recoveries collected | — |  |  | (0.3) |  |  | (0.3) |
Balance at December 31, 2024 | $ | 30.1 |  |  | $ | 6.6 |  |  | $ | 36.7 |
Current period provision for expected credit losses | — |  |  | 0.8 |  |  | 0.8 |
Write-offs charged against the allowance | — |  |  | (0.7) |  |  | (0.7) |
Recoveries collected | — |  |  | — |  |  | — |
Foreign currency translation | — |  |  | 0.1 |  |  | 0.1 |
Balance at December 31, 2025 | $ | 30.1 |  |  | $ | 6.8 |  |  | $ | 36.9 |

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