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REGULATORY CAPITAL (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Cboe Trading
Regulatory Requirement
Capital	$ 16.6
Minimum Requirement	0.7
BIDS Trading
Regulatory Requirement
Capital	13.7
Minimum Requirement	$ 0.2
Cboe Trading and BIDS Trading
Regulatory Requirement
Minimum net capital required to be maintained, option 1 - percentage of aggregate indebtedness items	6.67%
Minimum net capital required to be maintained, option 2 - amount	$ 0.1
Cboe Europe Limited
Regulatory Requirement
Capital	51.9
Minimum Requirement	24.3
Cboe Chi-X Europe
Regulatory Requirement
Capital	0.2
Minimum Requirement	0.1
Capital resources requirement	0.1
Cboe Europe NL
Regulatory Requirement
Capital	7.5
Minimum Requirement	5.3
Cboe SEF
Regulatory Requirement
Annual operating expenses for swap execution facility capital adequacy tests	0.8
Six month operating expenses for swap execution facility capital adequacy tests	0.4
CFE
Regulatory Requirement
Annual operating expenses for registered futures exchange capital adequacy tests	50.1
Six month operating expenses for registered futures exchange capital adequacy tests	25.1
EuroCCP
Regulatory Requirement
Capital	50.7
Minimum Requirement	30.2
MATCHNow
Regulatory Requirement
Capital	2.5
Minimum Requirement	$ 0.2

X

- Definition

Capital Resources Requirement

+ References

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Contract Markets, Annual Operating Expenses for Determination of Resource Adequacy

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- Definition

Amount of minimum net capital required to be maintained.

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- Definition

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+ References

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- Definition

Amount of total capital as defined by regulatory framework.

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