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Document and Entity Information
Mar. 10, 2025
Cover [Abstract]  
Entity Address, Address Line One Illinois      
Amendment Flag false
Entity Central Index Key 0001156375
Document Type 8-K
Document Period End Date Mar. 10, 2025
Entity Registrant Name CME GROUP INC.
Entity Incorporation State Country Code DE
Entity File Number 001-31553
Entity Tax Identification Number 36-4459170
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Class A Common Stock
Trading Symbol CME
Security Exchange Name NASDAQ
Entity Emerging Growth Company false