Gas and NGLs Stored Underground and Gas and NGLs Receivables and Payables (Details) pounds in Millions, MMBbls in Millions, MMBTU in Millions, $ in Millions |
Sep. 30, 2026
USD ($)
$ / MMBTU
$ / lb
MMBTU
MMBbls
pounds
|
Dec. 31, 2025
USD ($)
$ / MMBTU
MMBTU
MMBbls
pounds
|
|---|---|---|
| Oil and Gas, Gas-Balancing Arrangement [Abstract] | ||
| Gas balancing measurement (in TBtu) | MMBTU | 9.4 | 13.1 |
| Average market price of gas assumed (in dollars per MMBTU) | $ / MMBTU | 3.03 | 3.90 |
| Gas imbalance to subsidiaries asset liability | $ 28.5 | $ 51.1 |
| Natural gas liquids balancing measurement (in MMBbls) (less than) | MMBbls | 0.1 | 0.0 |
| Natural gas liquids imbalance to subsidiaries of asset liability | $ 0.1 | |
| Ethylene loaned volume (in pounds) | pounds | 10.0 | 0.0 |
| Average market price of ethylene assumed (in dollars per pound) | $ / lb | 0.23 | |
| Ethylene loaned balance due to operating subsidiaries (asset) | $ 2.3 |