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Stock-Based Payments (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 1,115,055 | 1,264,287 |
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 |  | $ 135,000,000 |  |
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 |  | $ 15,000,000 | $ 16,700,000 | $ 23,100,000
Granted performance shares |  | 499,632 |  |
Restricted Class A common stock, fair value |  | $ 65,700,000 | 79,400,000 | 77,700,000
Total expense for stock payments |  | $ 76,400,000 | $ 96,900,000 | $ 85,800,000
Share-based compensation arrangement by share-based payment award, discount from market price |  | 90.00% |  |
Class A common stock issued to participating employees |  | 37,861 | 44,029 | 26,134
Director Stock Plan; Class A Shares [Member] |  |  |  |
Total expense for stock payments |  | $ 2,900,000 | $ 3,100,000 | $ 3,000,000
Annual award of class A common stock value |  | 120,000 |  |
Annual stipend allowance in shares of stock |  | $ 80,000 |  |
Annual stipend allowance in shares of stock (in shares) |  | 13,769 | 17,322 | 16,328
Director Stock Plan; Class A Shares [Member] | Subsequent Event |  |  |  |
Annual award of class A common stock value | $ 145,000 |  |  |
Annual stipend allowance in shares of stock | $ 95,000 |  |  |
Employee Stock Purchase Plan; Class A Shares [Member] |  |  |  |
Total expense for stock payments |  | $ 800,000 | $ 800,000 | $ 500,000
Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 2 years |  |
Performance Shares [Member] |  |  |  |
Granted performance shares |  | 138,969 |  |
Restricted Class A common stock, fair value |  | $ 32,600,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock options, granted, shares |  | 11,384 |  |
Class A Common Stock (Shares) [Member] |  |  |  |
Stock options, granted, shares |  | 349,279 |  |
Restricted Class A common stock, fair value |  | $ 68,400,000 |  |
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 |  | 25,100,000 |  |

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