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Stock-Based Payments (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   1,099,880 1,117,459  
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   $ 131,100,000    
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   468,675    
Restricted Class A common stock, fair value   $ 49,600,000 $ 52,200,000 $ 65,700,000
Total expense for stock payments   $ 83,700,000 $ 84,800,000 $ 76,400,000
Share-based compensation arrangement by share-based payment award, discount from market price   90.00%    
Class A common stock issued to participating employees   40,960 41,722 37,861
Director Stock Plan; Class A Shares [Member]        
Total expense for stock payments   $ 3,600,000 $ 3,600,000 $ 2,900,000
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)   19,966 18,836 13,769
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   370,024    
Restricted Class A common stock, fair value   $ 78,400,000    
Performance Shares [Member]        
Granted performance shares   84,397    
Restricted Class A common stock, fair value   $ 19,000,000    
Restricted Stock Units (RSUs) [Member]        
Stock options, granted, shares   10,774    
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   25,600,000