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Intangible Assets and Goodwill Intangible Assets and Goodwill (Components of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 10,528.0	$ 10,798.8
CBOT [Member]
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 [Member]
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 [Member]
Goodwill [Line Items]
Goodwill	2,959.0	3,229.8	3,173.5
Goodwill, Other Increase (Decrease)	(24.6)	56.3
Disposal Group, Including Discontinued Operation, Goodwill	(246.2)	0.0
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	10,528.0	10,798.8	$ 10,742.5
Goodwill, Other Increase (Decrease)	(24.6)	56.3
Disposal Group, Including Discontinued Operation, Goodwill	$ (246.2)	$ 0.0

X

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Amount classified as goodwill attributable to disposal group held for sale or disposed of.

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