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DEBT - Debt repayments (Details) - USD ($)
$ in Millions
May 01, 2020
Sep. 30, 2023
Dec. 31, 2022
Long-term Debt      
Remainder of 2023   $ 75.0  
2027   650.0  
Thereafter   800.0  
Principal amounts repayable   1,525.0  
Debt issuance costs   (6.2)  
Unamortized discounts on notes   (5.2)  
Total debt outstanding   $ 1,513.6 $ 1,742.0
Cboe Digital | Paycheck Protection Program ("PPP")      
Debt      
Proceeds from loan subsequently forgiven $ 1.3