Annual report [Section 13 and 15(d), not S-K Item 405]

COMMITMENTS AND CONTINGENCIES (Details)

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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
12 Months Ended
Aug. 26, 2025
USD ($)
Jun. 30, 2025
USD ($)
item
Nov. 08, 2024
USD ($)
Oct. 21, 2024
USD ($)
Oct. 09, 2024
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 15, 2025
USD ($)
Dec. 31, 2010
USD ($)
COMMITMENTS AND CONTINGENCIES                    
Contractual obligation bonds outstanding           $ 452.3        
Contractual obligation, surety bonds subject to escalation           70.0        
Additional royalty due to disallowed deductions                   $ 4.7
Reversal of royalties accrued $ 5.3                  
Surety providers | item   2                
Withdrawal in collateral demands                 $ 94.0  
The Sureties                    
COMMITMENTS AND CONTINGENCIES                    
Surety bonds issued     $ 183.0              
Philadelphia Indemnity Insurance Company                    
COMMITMENTS AND CONTINGENCIES                    
Surety bonds issued     71.0              
The Sureties and PIIC                    
COMMITMENTS AND CONTINGENCIES                    
Surety bonds issued     254.0              
Security requirements for decommissioning obligations                    
COMMITMENTS AND CONTINGENCIES                    
Expenses related to surety bonds paid           6.9 $ 7.5 $ 7.4    
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 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              
Heidelberg Field                    
COMMITMENTS AND CONTINGENCIES                    
Other commitment expense           $ 0.1 $ 0.4 $ 1.0