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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended
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Sep. 30, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gain (loss) resulting from the change in the fair value of investments |  | $ 47.8
Geothermal Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity and debt securities | $ 2.7 | $ 11.8
ADNOC Drilling |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Payments to acquire investments | $ 100.0 |
Investment balance (in shares) | 159.7 |
Ownership percentage | 1.00% |
Investments lockup period | 3 years |

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