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Stock-Based Payments (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 1,117,459 | 1,115,055 |
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 |  | $ 134,500,000 |  |
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, Weighted Average Period of Recognition, years |  | 2 years 2 months 12 days |  |
Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value |  | $ 100,000 | $ 15,000,000 | $ 16,700,000
Granted performance shares |  | 492,307 |  |
Restricted Class A common stock, fair value |  | $ 52,200,000 | 65,700,000 | 79,400,000
Total expense for stock payments |  | $ 84,800,000 | $ 76,400,000 | $ 96,900,000
Share-based compensation arrangement by share-based payment award, discount from market price |  | 90.00% |  |
Class A common stock issued to participating employees |  | 41,722 | 37,861 | 44,029
Director Stock Plan; Class A Shares [Member] |  |  |  |
Total expense for stock payments |  | $ 3,600,000 | $ 2,900,000 | $ 3,100,000
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) |  | 18,836 | 13,769 | 17,322
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 |  | 388,423 |  |
Restricted Class A common stock, fair value |  | $ 76,700,000 |  |
Performance Shares [Member] |  |  |  |
Granted performance shares |  | 91,964 |  |
Restricted Class A common stock, fair value |  | $ 19,500,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock options, granted, shares |  | 11,920 |  |
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 |  | 25,400,000 |  |

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