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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2022
INVESTMENTS |
Schedule of investments | As of December 31, 2022 and 2021, the Company's investments were comprised of the following (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2022 |  | 2021
Equity method investments: | ​ | ​ | ​ | ​ | ​ | ​
Investment in 7Ridge Investments 3 LP | ​ | $ | 215.4 | ​ | $ | 209.5
Total equity method investments | ​ | ​ | 215.4 | ​ | ​ | 209.5
​ | ​ | ​ | ​ | ​ | ​ | ​
Other equity investments: | ​ | ​ | ​ | ​ | ​ | ​
Investment in Eris Innovations Holdings, LLC | ​ | ​ | 20.0 | ​ | ​ | 20.0
Investment in CSD Br | ​ | ​ | 5.9 | ​ | ​ | —
Investment in Coin Metrics Inc. | ​ | ​ | 5.0 | ​ | ​ | —
Investment in Cboe Vest Financial Group, Inc. | ​ | ​ | 2.9 | ​ | ​ | 2.9
Investment in Effective Investing Limited | ​ | ​ | 1.8 | ​ | ​ | —
Investment in OCC | ​ | ​ | 0.3 | ​ | ​ | 0.3
Investment in American Financial Exchange, LLC | ​ | ​ | — | ​ | ​ | 10.6
Investment in Eris Digital Holdings, LLC | ​ | ​ | — | ​ | ​ | 1.1
Other equity investments | ​ |  | 1.9 | ​ |  | 1.4
Total other equity investments | ​ | ​ | 37.8 | ​ | ​ | 36.3
​ | ​ | ​ | ​ | ​ | ​ | ​
Total investments | ​ | $ | 253.2 | ​ | $ | 245.8
​

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