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INVESTMENTS - Other Equity Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2020 | May 31, 2020 | Jan. 31, 2016 | Dec. 31, 2021 | Dec. 31, 2020
Other Equity Investments |  |  |  |  |
Impairment of investments |  |  |  | $ 5.6 | $ 15.1
Investment in OCC |  |  |  |  |
Other Equity Investments |  |  |  |  |
Investment percentage |  |  |  | 20.00% |
Investment in Cboe Vest Financial Group, Inc. |  |  |  |  |
Other Equity Investments |  |  |  |  |
Other equity investments |  |  | $ 18.9 |  |
Payments made to former share holder |  |  | 14.9 |  |
Payments made to Vest for newly issued shares |  |  | $ 4.0 |  |
Ownership percentage |  |  | 60.00% |  |
Investment in Cboe Vest Financial Group, Inc. | Put Option |  |  |  |  |
Other Equity Investments |  |  |  |  |
Option exercise period |  |  | 5 years |  |
Investment in Cboe Vest Financial Group, Inc. | Call Option |  |  |  |  |
Other Equity Investments |  |  |  |  |
Option exercise period |  |  | 5 years |  |
Investment in Eris Digital Holdings, LLC |  |  |  |  |
Other Equity Investments |  |  |  |  |
Recognized gain or loss on restructuring |  | $ 0.0 |  |  |
Investment in American Financial Exchange, LLC |  |  |  |  |
Other Equity Investments |  |  |  |  |
Impairment of investments | $ 4.1 |  |  |  |

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