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MARKETABLE EQUITY SECURITIES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Marketable Securities |  |  |  |  |
Increase (decrease) in fair value of equity securities | $ (2.2) | $ 2.0 | $ (1.6) | $ 3.9 |
Investment value | $ 0.2 |  | $ 0.2 |  | $ 1.7
TriStar |  |  |  |  |
Marketable Securities |  |  |  |  |
Stock that can be purchased by warrants (in shares) | 19,640,000 |  | 19,640,000 |  |

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