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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2022 | Mar. 31, 2022
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 |  | $ 16.7 | $ 64.5
Geothermal Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity and debt securities | $ 2.7 | $ 16.9 | $ 16.9
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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