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Stock-Based Payments (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 1,087,358 | 1,099,880 |
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 |  | $ 139,600,000 |  |
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 |  | 484,909 |  |
Restricted Class A common stock, fair value |  | $ 61,400,000 | $ 49,600,000 | $ 52,200,000
Total expense for stock payments |  | $ 90,400,000 | $ 83,700,000 | $ 84,800,000
Share-based compensation arrangement by share-based payment award, discount from market price |  | 90.00% |  |
Class A common stock issued to participating employees |  | 37,466 | 40,960 | 41,722
Director Stock Plan; Class A Shares [Member] |  |  |  |
Total expense for stock payments |  | $ 3,600,000 |  |
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) |  | 18,901 | 19,966 | 18,836
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 |  | 342,716 |  |
Restricted Class A common stock, fair value |  | $ 77,700,000 |  |
Performance Shares [Member] |  |  |  |
Granted performance shares |  | 129,381 |  |
Restricted Class A common stock, fair value |  | $ 33,400,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock options, granted, shares |  | 12,812 |  |
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 |  | 25,900,000 |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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