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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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