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Stock-Based Payments (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 1,099,880 | 1,117,459 |
Vesting percentage after one year |  | 25.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  | $ 131,100,000 |  |
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, Weighted Average Period of Recognition, years |  | 2 years 2 months 12 days |  |
Granted performance shares |  | 468,675 |  |
Restricted Class A common stock, fair value |  | $ 49,600,000 | $ 52,200,000 | $ 65,700,000
Total expense for stock payments |  | $ 83,700,000 | $ 84,800,000 | $ 76,400,000
Share-based compensation arrangement by share-based payment award, discount from market price |  | 90.00% |  |
Class A common stock issued to participating employees |  | 40,960 | 41,722 | 37,861
Director Stock Plan; Class A Shares [Member] |  |  |  |
Total expense for stock payments |  | $ 3,600,000 | $ 3,600,000 | $ 2,900,000
Annual award of class A common stock value | $ 145,000 |  |  |
Annual stipend allowance in shares of stock | $ 95,000 |  |  |
Annual stipend allowance in shares of stock (in shares) |  | 19,966 | 18,836 | 13,769
Employee Stock Purchase Plan; Class A Shares [Member] |  |  |  |
Total expense for stock payments |  | $ 800,000 |  |
Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 2 years |  |
Class A Common Stock (Shares) [Member] |  |  |  |
Stock options, granted, shares |  | 370,024 |  |
Restricted Class A common stock, fair value |  | $ 78,400,000 |  |
Performance Shares [Member] |  |  |  |
Granted performance shares |  | 84,397 |  |
Restricted Class A common stock, fair value |  | $ 19,000,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock options, granted, shares |  | 10,774 |  |
CME Group Omnibus Stock Plan [Member] |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares reserved |  | 40,200,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 25,600,000 |  |

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