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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 |  |

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