Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 23, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Entity File Number	001-34774
Entity Registrant Name	Cboe Global Markets, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-5446972
Entity Address, Address Line One	400 South LaSalle Street
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60605
City Area Code	312
Local Phone Number	786-5600
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	CBOE
Security Exchange Name	CboeBZX
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		106,623,085
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001374310
Amendment Flag	false