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Capital Stock (Capital stock) (Details) - shares
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,099,880 1,117,459    
Class A Common Stock        
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000    
Common Stock, Shares, Outstanding 359,231,000 358,929,000 358,599,000 358,110,000
Class B Common Stock, Class B1 [Member]        
Common Stock, Shares, Outstanding 600 600    
Class B Common Stock, Class B2 [Member]        
Common Stock, Shares, Outstanding 800 800    
Class B Common Stock, Class B3 [Member]        
Common Stock, Shares, Outstanding 1,300 1,300    
Class B Common Stock, Class B4 [Member]        
Common Stock, Shares, Outstanding 400 400    
Convertible Preferred Stock        
Common Stock, Shares, Outstanding 4,584,000 4,584,000 4,584,000 0
Preferred Stock, Shares Authorized 10,000,000 10,000,000    
Preferred Stock, Shares Outstanding 4,584,000 4,584,000    
CME Group Omnibus Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 25,600,000      
Director Stock Plan; Class A Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 469,322