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Performance Bonds and Guaranty Fund Contributions (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) days | Dec. 31, 2023 USD ($)
Percentage share of cross-margining collateral | 50.00% |
Line of Credit, Guaranty Fund Collateral Available | $ 10,100.0 |
Days fully secured | days | 364 |
Intraday settlements of cash performance bonds | $ 198.4 | $ 237.5
Average daily clearing settlement | 5,700.0 |
364-day fully secured, committed line of credit |  |
Line of Credit Facility, Maximum Borrowing Capacity | 7,000.0 |
Option on increase in line of credit | 10,000.0 |
Revolving senior credit facility |  |
Line of Credit Facility, Maximum Borrowing Capacity | 2,300.0 |
CME Base Guaranty Fund [Member] |  |
Corporate Contribution | 100.0 |
CME IRS Guaranty Fund [Member] [Member] |  |
Corporate Contribution | 150.0 |
Federal Reserve Reinvestment [Member] |  |
Cash Equivalents, at Carrying Value | $ 87,400.0 | $ 79,300.0

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