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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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