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Intangible Assets And Goodwill (Components of Goodwill) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]        
Goodwill $ 10,477.6   $ 10,482.5  
CBOT        
Goodwill [Line Items]        
Goodwill 5,066.4   5,066.4 $ 5,066.4
Goodwill, Other Increase (Decrease) 0.0 $ 0.0    
NYMEX        
Goodwill [Line Items]        
Goodwill 2,462.2   2,462.2 2,462.2
Goodwill, Other Increase (Decrease) 0.0 0.0    
NEX        
Goodwill [Line Items]        
Goodwill 2,913.8   2,913.5 2,959.0
Goodwill, Other Increase (Decrease) 0.3 (45.5)    
Other CME Segments        
Goodwill [Line Items]        
Goodwill 35.2   40.4 40.4
Goodwill, Other Increase (Decrease) (5.2) 0.0    
CME Group Inc.        
Goodwill [Line Items]        
Goodwill 10,477.6   $ 10,482.5 $ 10,528.0
Goodwill, Other Increase (Decrease) $ (4.9) $ (45.5)