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Concentrations of Credit Risk	12 Months Ended
Concentrations of Credit Risk	Dec. 31, 2023
Risks and Uncertainties [Abstract]
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments could potentially expose us to concentrations of credit risk, including our unsecured receivables from the Exchange. The majority of our revenue and receivables are from the Exchange and its affiliates. See also Note 1, "Nature of Operations". Net management fee amounts and other reimbursements due from the Exchange and its affiliates were $625.3 million and $524.9 million at December 31, 2023 and 2022, respectively, which includes a current expected credit loss allowance of $0.6 million in both periods.