XML 15 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 07, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-31553    
Entity Registrant Name CME GROUP INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-4459170    
Entity Address, Address Line One 20 South Wacker Drive    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60606    
City Area Code 312    
Local Phone Number 930-1000    
Title of 12(b) Security Class A Common Stock $0.01 par value    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 66.3
Documents Incorporated by Reference
DocumentsForm 10-K Reference
Portions of CME Group Inc.’s Proxy Statement for the 2024 Annual Meeting of ShareholdersPart III
    
Entity Central Index Key 0001156375    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol CME    
Amendment Flag false    
Document Financial Statement Error Correction [Flag] false    
Class A Common Stock (Shares) [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   359,991,858  
Class B Common Stock, Class B1 [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   625  
Class B Common Stock, Class B2 [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   813  
Class B Common Stock, Class B3 [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,287  
Class B Common Stock, Class B4 [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   413