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Intangible Assets and Goodwill Goodwill (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill [Line Items]  
Goodwill Disclosure [Text Block]
Goodwill activity consisted of the following for the years ended December 31, 2023 and 2022:
(in millions)Balance at December 31, 2022
Other
Activity (1)
Balance at December 31, 2023
CBOT Holdings$5,066.4 $— $5,066.4 
NYMEX Holdings2,462.2 — 2,462.2 
NEX2,913.5 17.3 2,930.8 
Other40.4 (4.5)35.9 
Total Goodwill$10,482.5 $12.8 $10,495.3 
(in millions)Balance at December 31, 2021
Other
Activity (1)
Balance at December 31, 2022
CBOT Holdings$5,066.4 $— $5,066.4 
NYMEX Holdings2,462.2 — 2,462.2 
NEX2,959.0 (45.5)2,913.5 
Other40.4 — 40.4 
Total Goodwill$10,528.0 $(45.5)$10,482.5 
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