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DEBT - Debt repayments (Details) - USD ($)
$ in Millions
May 01, 2020
Sep. 30, 2022
Dec. 31, 2021
Long-term Debt      
2023   $ 425.0  
Thereafter   1,450.0  
Principal amounts repayable   1,875.0  
Debt issuance costs   (9.0)  
Unamortized discounts on notes   (6.2)  
Total debt outstanding   $ 1,859.8 $ 1,299.3
Cboe Digital | Paycheck Protection Program ("PPP")      
Debt      
Proceeds from loan subsequently forgiven $ 1.3