Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables (Details) MMBTU in Millions, $ in Millions	Mar. 31, 2025 USD ($) $ / lb $ / MMBTU MMBTU MMBbls pounds	Dec. 31, 2024 USD ($) $ / MMBTU MMBTU MMBbls pounds
Oil and Gas, Gas-Balancing Arrangement [Abstract]
Gas balancing measurement (in TBtu) | MMBTU	26.7	9.8
Average market price of gas assumed (in dollars per MMBTU) | $ / MMBTU	3.80	2.98
Gas imbalance to subsidiaries asset liability	$ 101.5	$ 29.2
Ethylene loaned volume (in pounds) | pounds	33,000,000.0	0
Average market price of ethylene assumed (in dollars per pound) | $ / lb	0.23
Ethylene loaned balance due to operating subsidiaries (asset)	$ 7.6
Natural gas liquids balancing measurement (in MMBbls) | MMBbls	0	100,000
Natural gas liquids imbalance to subsidiaries of asset liability		$ 0.3