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

SUPPLEMENTAL OIL AND GAS DISCLOSURES (UNAUDITED) - Standardized Measure of Discounted Future Net Cash Flows (Details)

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SUPPLEMENTAL OIL AND GAS DISCLOSURES (UNAUDITED) - Standardized Measure of Discounted Future Net Cash Flows (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Future Net Cash Flow, after Discount [Abstract]        
Future cash inflows $ 4,388.4 $ 5,123.1 $ 4,282.3  
Production (2,369.8) (2,361.9) (2,007.6)  
Development and abandonment (1,165.8) (1,645.0) (1,052.3)  
Income taxes (175.1) (215.9) (210.3)  
Future net cash inflows 677.7 900.3 1,012.1  
10% annual discount factor (26.4) (160.2) (328.9)  
Standardized measure of discounted future net cash flows $ 651.3 $ 740.1 $ 683.2 $ 2,263.0