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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions					6 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Jun. 30, 2025 USD ($) item	Nov. 08, 2024 USD ($)	Oct. 21, 2024 USD ($)	Oct. 09, 2024 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2010 USD ($)
Additional royalty due to disallowed deductions	$ 4.7				$ 4.7	$ 4.7
Accrued Royalties	5.0				5.0
Estimated penalties	0.3				0.3
Decommissioning obligations					1.4
Increase in decommissioning obligation accrual					13.7
Accrual for decommissioning obligations	$ 34.8				$ 34.8
The Sureties
Surety bonds issued		$ 183.7
Philadelphia Indemnity Insurance Company
Surety bonds issued		71.0
The Sureties and PIIC
Surety bonds issued		254.7
Surety Bonds
Surety bonds issued			$ 111.0	$ 55.0
Cancelled bonds				13.1
Cash collateral			$ 23.0	$ 55.0
Surety Bonds \| The Sureties
Surety providers \| item	2
Surety bonds issued	$ 105.0
Surety Bonds \| Applied litigation
Surety bonds issued		11.3
Cash collateral		11.3
Unpaid in loss contingency		0.4
Surety Bonds \| U.S. Fire Litigation
Surety bonds issued		93.5
Cash collateral		$ 93.5