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Related Party Transactions
 12 Months Ended
Dec. 31, 2025
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
    
The Company incurs expenses and maintains balances with its affiliates in the ordinary course of business. As of December 31, 2025, and December 31, 2024, the Company had a net payables to its affiliates of $10.6 million and a net payables to its affiliates of $0.1 million, respectively.

The Company has held a minority interest in JNX since 2016 (see Note 10 “Financial Assets and Liabilities”). The Company pays exchange fees to JNX for the trading activities conducted on its proprietary trading system. The Company paid $11.3 million, $11.1 million, and $12.1 million for the years ended December 31, 2025, 2024, and 2023, respectively, to JNX for these trading activities.
 
The Company pays monthly use fees and makes certain contributions to a JV in which it holds an interest (see Note 13 “Variable Interest Entities”). These monthly fees are for the use of communication networks operated by the JV and are recorded within Communications and data processing on the Consolidated Statements of Comprehensive Income. The Company previously held a similar arrangement with another telecommunication JV and paid a monthly use fee, and the Company disposed of its interests in this JV and ended the monthly fee arrangement as of September 1, 2024. The Company made payments to these JVs of $45.1 million, $35.5 million, and $32.6 million to the JVs for the years ended December 31, 2025, 2024, and 2023, respectively.

The Company has an interest in Members Exchange, a member-owned equities exchange. The Company pays regulatory and transaction fees and receives rebates from trading activities. The Company paid $5.5 million, $8.0 million, and $4.8 million for the years ended December 31, 2025, 2024, and 2023, respectively.

The Company made a one-time payment of $0.1 million to a founder-affiliated corporation in 2024 for expenses related to the Company’s corporate events held during the period.

In the second quarter of 2022, the Company formed a JV to support the growth and expansion of a multi-asset request-for-quote communication platform and consolidated this JV. See Note 13 “Variable Interest Entities” for further details. On April 19, 2024, the Company entered into an agreement to sell a 49% interest in this JV. The sale was completed on May 9, 2025. Upon the closing of the sale, the Company retains a minority interest of approximately 2% in RFQ-hub. The Company ceased to control, and deconsolidated, RFQ-hub at such time. See Note 3 “Sale of RFQ-hub” for further details.