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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2021
INVESTMENTS |
Schedule of investments | As of June 30, 2021 and December 31, 2020, the Company’s investments were comprised of the following (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Equity method investments: | ​ | ​ | ​ | ​ | ​ | ​
Investment in Signal Trading Systems, LLC | ​ | $ | — | ​ | $ | 2.0
Total equity method investments | ​ | ​ | — | ​ | ​ | 2.0
​ | ​ | ​ | ​ | ​ | ​ | ​
Other equity investments: | ​ | ​ | ​ | ​ | ​ | ​
Investment in Eris Exchange Holdings, LLC | ​ | ​ | 20.0 | ​ | ​ | 20.0
Investment in American Financial Exchange, LLC | ​ | ​ | 10.6 | ​ | ​ | 10.6
Investment in Cboe Vest Financial Group, Inc. | ​ | ​ | 2.9 | ​ | ​ | 2.9
Investment in Eris Digital Holdings, LLC | ​ | ​ | 1.2 | ​ | ​ | 0.8
Investment in OCC | ​ | ​ | 0.3 | ​ | ​ | 0.3
Other equity investments | ​ |  | 6.1 | ​ |  | 6.1
Total other equity investments | ​ | ​ | 41.1 | ​ | ​ | 40.7
​ | ​ | ​ | ​ | ​ | ​ | ​
Total investments | ​ | $ | 41.1 | ​ | $ | 42.7

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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