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Intangible Assets And Goodwill (Components of Goodwill) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]      
Goodwill $ 10,490.5 $ 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 2,921.5 2,913.5 2,959.0
Goodwill, Other Increase (Decrease) 8.0 (45.5)  
Other CME Segments      
Goodwill [Line Items]      
Goodwill 40.4 40.4 40.4
Goodwill, Other Increase (Decrease) 0.0 0.0  
CME Group Inc.      
Goodwill [Line Items]      
Goodwill 10,490.5 10,482.5 $ 10,528.0
Goodwill, Other Increase (Decrease) $ 8.0 $ (45.5)