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DEBT - Debt repayments (Details) - USD ($) $ in Millions	May 01, 2020	Dec. 31, 2023	Dec. 31, 2022
Long-term Debt
2027		$ 650.0
Thereafter		800.0
Principal amounts repayable		1,450.0
Debt issuance costs		(5.9)
Unamortized discounts on notes		(4.9)
Total debt outstanding		$ 1,439.2	$ 1,742.0
Cboe Digital \| Paycheck Protection Program ("PPP")
Debt
Proceeds from loan subsequently forgiven	$ 1.3