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Intangible Assets And Goodwill (Components of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 10,515.8	$ 10,528.0
CBOT
Goodwill [Line Items]
Goodwill	5,066.4	5,066.4	$ 5,066.4
Goodwill, Other Increase (Decrease)	0.0	0.0
Disposal Group, Including Discontinued Operation, Goodwill	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
Disposal Group, Including Discontinued Operation, Goodwill	0.0	0.0
NEX
Goodwill [Line Items]
Goodwill	2,946.8	2,959.0	3,229.8
Goodwill, Other Increase (Decrease)	(12.2)	(24.6)
Disposal Group, Including Discontinued Operation, Goodwill	0.0	(246.2)
Other CME Segments
Goodwill [Line Items]
Goodwill	40.4	40.4	40.4
Goodwill, Other Increase (Decrease)	0.0	0.0
Disposal Group, Including Discontinued Operation, Goodwill	0.0	0.0
CME Group Inc.
Goodwill [Line Items]
Goodwill	10,515.8	10,528.0	$ 10,798.8
Goodwill, Other Increase (Decrease)	(12.2)	(24.6)
Disposal Group, Including Discontinued Operation, Goodwill	$ 0.0	$ (246.2)

X

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