XML 215 R58.htm IDEA: XBRL DOCUMENT v3.24.0.1
Asset Retirement Obligations (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Cash received $ 2.2    
Estimated asset retirement obligation 1.9    
Gain on the assumption of third-party asset retirement obligation $ 0.3    
Caddo Creek      
Segment Reporting Information [Line Items]      
Membership interest 100.00%    
Bellaire      
Segment Reporting Information [Line Items]      
Initial investment amount     $ 5.0
Fair value of trust assets $ 11.2 $ 9.9