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Intangible Assets and Goodwill Goodwill (Tables)
 12 Months Ended
Dec. 31, 2022
Goodwill [Line Items]  
Goodwill Disclosure [Text Block]
Goodwill activity consisted of the following for the years ended December 31, 2022 and 2021:
(in millions)Balance at December 31, 2021
Deconsolidation(1)
Other
Activity (2)
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 
(in millions)Balance at December 31, 2020
Deconsolidation(1)
Other
Activity (2)
Balance at December 31, 2021
CBOT Holdings$5,066.4 $— $— $5,066.4 
NYMEX Holdings2,462.2 — — 2,462.2 
NEX3,229.8 (246.2)(24.6)2,959.0 
Other40.4 — — 40.4 
Total Goodwill$10,798.8 $(246.2)$(24.6)$10,528.0 
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