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REVENUE RECOGNITION - Rollforward of contract liabilities (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Revenue recognized from contract liabilities and remaining balance
Beginning Balance	$ 15.3
Cash Additions	18.3
Revenue Recognized	(10.9)
Ending Balance	22.7
Liquidity provider sliding scale
Revenue recognized from contract liabilities and remaining balance
Cash Additions	7.2
Revenue Recognized	(3.6)
Ending Balance	3.6
Other, net
Revenue recognized from contract liabilities and remaining balance
Beginning Balance	15.3
Cash Additions	11.1
Revenue Recognized	(7.3)
Ending Balance	$ 19.1

X

- Definition

Amount of additions in obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

No definition available.

+ Details

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Namespace Prefix:	cboe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount Revenue recognized from current period increase in contract liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	cboe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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