XML 43 R34.htm IDEA: XBRL DOCUMENT v3.23.2
Intangible Assets And Goodwill (Components of Goodwill) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]        
Goodwill   $ 10,490.7 $ 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   2,926.3 2,913.5 2,959.0
Goodwill, Other Increase (Decrease) (45.5) 12.8    
Other CME Segments        
Goodwill [Line Items]        
Goodwill   35.8 40.4 40.4
Goodwill, Other Increase (Decrease) 0.0 (4.6)    
CME Group Inc.        
Goodwill [Line Items]        
Goodwill   10,490.7 $ 10,482.5 $ 10,528.0
Goodwill, Other Increase (Decrease) $ (45.5) $ 8.2