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EMPLOYEE BENEFIT PLAN (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
SMART Plan |  |  |  |  |
Defined Contribution Plan |  |  |  |  |
Total assets in the trust |  |  | $ 25,600,000 |  | $ 24,500,000
Company contribution amount | $ 2,800,000 | $ 2,600,000 | 5,000,000.0 | $ 4,100,000 |
Cboe Europe Employee Selected Stakeholder Contribution Plan |  |  |  |  |
Defined Contribution Plan |  |  |  |  |
Company contribution amount | 100,000 | $ 200,000 | 500,000 | $ 400,000 |
EuroCCP |  |  |  |  |
Defined Contribution Plan |  |  |  |  |
Company contribution amount | 200,000 |  | 400,000 |  |
Cboe Canadian Retirement Plan |  |  |  |  |
Defined Contribution Plan |  |  |  |  |
Company contribution amount | $ 31,400 |  | $ 60,100 |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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