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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) item | Nov. 08, 2024 USD ($) | Oct. 21, 2024 USD ($) | Oct. 09, 2024 USD ($) | Sep. 30, 2025 USD ($) | Jun. 15, 2025 USD ($) | Dec. 31, 2010 USD ($)
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Additional royalty due to disallowed deductions |  |  |  |  | $ 4.7 |  | $ 4.7
Accrued Royalties |  |  |  |  | 5.0 |  |
Estimated penalties |  |  |  |  | 0.3 |  |
Decommissioning obligations |  |  |  |  | 1.7 |  |
Increase in decommissioning obligation accrual |  |  |  |  | 13.7 |  |
Accrual for decommissioning obligations |  |  |  |  | $ 34.5 |  |
Withdrawal in collateral demands |  |  |  |  |  | $ 94.0 |
The Sureties |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Cash collateral |  | $ 183.0 |  |  |  |  |
Philadelphia Indemnity Insurance Company |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Surety bonds issued |  | 71.0 |  |  |  |  |
The Sureties and PIIC |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Cash collateral |  | 254.0 |  |  |  |  |
Surety Bonds |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Surety bonds issued |  |  | $ 111.0 | $ 55.0 |  |  |
Cancelled bonds |  |  |  | 13.1 |  |  |
Cash collateral |  |  | $ 23.0 | $ 55.0 |  |  |
Surety Bonds | The Sureties |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Surety providers | item | 2 |  |  |  |  |  |
Surety bonds issued | $ 105.0 |  |  |  |  |  |
Surety Bonds | Applied litigation |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Surety bonds issued |  | 11.3 |  |  |  |  |
Cash collateral |  | 11.3 |  |  |  |  |
Unpaid in loss contingency |  | 0.4 |  |  |  |  |
Surety Bonds | U.S. Fire Litigation |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |
Surety bonds issued |  | 93.5 |  |  |  |  |
Cash collateral |  | $ 93.5 |  |  |  |  |

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