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DEBT - Narrative (Details) |  |  | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 25, 2022 USD ($) subsidiary | Jul. 01, 2020 USD ($) | Sep. 30, 2025 USD ($) subsidiary | Sep. 30, 2025 EUR (€) subsidiary | Dec. 31, 2024 USD ($) | Mar. 16, 2022 USD ($) | Dec. 15, 2020 USD ($) | Jul. 01, 2020 EUR (€) | Jan. 12, 2017 USD ($)
Debt Instrument |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | $ 1,442,400,000 |  | $ 1,441,000,000 |  |  |  |
3.650% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 650,000,000 |  | $ 650,000,000 |  |  |  | $ 650,000,000
Interest rate (as a percent) |  |  | 3.65% | 3.65% | 3.65% |  |  |  | 3.65%
1.625% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 500,000,000 |  | $ 500,000,000 |  | $ 500,000,000 |  |
Interest rate (as a percent) |  |  | 1.625% | 1.625% | 1.625% |  | 1.625% |  |
3.000% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 300,000,000 |  | $ 300,000,000 | $ 300,000,000 |  |  |
Interest rate (as a percent) |  |  | 3.00% | 3.00% | 3.00% | 3.00% |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Redemption price (as a percent) |  |  | 101.00% |  |  |  |  |  |
Revolving Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Credit agreement, maximum borrowing capacity | $ 400,000,000 |  |  |  |  |  |  |  |
Term of agreement (in years) | 5 years |  |  |  |  |  |  |  |
Maximum borrowing capacity, increase limit | $ 200,000,000 |  |  |  |  |  |  |  |
Maximum borrowing capacity, total with increase | $ 600,000,000 |  |  |  |  |  |  |  |
Number of subsidiaries designated as additional borrowers | subsidiary |  |  | 0 | 0 |  |  |  |  |
Borrowings outstanding |  |  | $ 0 |  |  |  |  |  |
Borrowing capacity available |  |  | $ 400,000,000 |  |  |  |  |  |
Minimum consolidated interest ratio |  |  | 4.00 |  |  |  |  |  |
Maximum consolidated leverage ratio |  |  | 3.50 | 3.50 |  |  |  |  |
Minimum consolidated interest ratio, scenario one |  |  | 4.25 |  |  |  |  |  |
Minimum consolidated interest ratio, scenario two |  |  | 4.00 |  |  |  |  |  |
Revolving Credit Agreement | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Number of subsidiaries that may be designated as additional borrowers | subsidiary | 1 |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.75% |  |  |  |  |  |
Revolving Credit Agreement | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 1.25% |  |  |  |  |  |
Revolving Credit Agreement | Floor Rate |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 1.00% |  |  |  |  |  |
Revolving Credit Agreement | Prime Rate | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.00% |  |  |  |  |  |
Revolving Credit Agreement | Prime Rate | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.25% |  |  |  |  |  |
Revolving Credit Agreement | Dollars SFOR |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.10% |  |  |  |  |  |
Revolving Credit Agreement | Sterling SONIA |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.0326% |  |  |  |  |  |
Revolving Credit Agreement | Euros EURIBOR |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.00% |  |  |  |  |  |
Revolving Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Credit agreement, maximum borrowing capacity | $ 25,000,000 |  |  |  |  |  |  |  |
Cboe Clear Europe Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt instrument face amount | € |  |  |  |  |  |  |  | € 1,200,000,000 |
Maximum borrowing capacity, increase limit | € |  |  |  |  |  |  |  | 500,000,000 |
Maximum borrowing capacity, total with increase | € |  |  |  |  |  |  |  | 1,700,000,000 |
Borrowings outstanding | € |  |  |  | € 0 |  |  |  |  |
Borrowing capacity available | € |  |  |  | € 1,200,000,000 |  |  |  |  |
Commitment fee percentage |  | 0.35% |  |  |  |  |  |  |
Debt instrument, threshold amount transferred to provider of settlement or custody services | € |  |  |  |  |  |  |  | 500,000,000 |
Cboe Clear Europe Credit Facility | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt instrument, threshold net worth on each drawdown |  | $ 1,750,000,000 |  |  |  |  |  |  |
Debt instrument, amount to meet minimum liquidity regulations | € |  |  |  |  |  |  |  | € 30,000,000 |
Cboe Clear Europe Credit Facility | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  | 1.60% |  |  |  |  |  |  |
Cboe Clear Europe Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  | 0.50% |  |  |  |  |  |  |

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