Credit Risk (Details) MMBTU in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) $ / MMBTU MMBTU MMBbls pounds	Dec. 31, 2024 USD ($) $ / MMBTU MMBTU MMBbls pounds	Dec. 31, 2023 USD ($)
Concentration Risk [Line Items]
Operating revenues	$ 2,305.8	$ 2,028.1	$ 1,617.7
Gas balancing measurement (in TBtu) | MMBTU	13.1	9.8
Average market price of gas assumed (in dollars per MMBTU) | $ / MMBTU	3.90	2.98
Gas imbalance to subsidiaries asset liability	$ 51.1	$ 29.2
Natural gas liquids balancing volume (in MMBbls) (less than) | MMBbls	0	100,000
Natural gas liquids imbalance to subsidiaries asset liability		$ 0.3
Ethylene loaned volume | pounds	0	0
Customer Concentration Risk
Concentration Risk [Line Items]
Operating revenues	$ 237.5
Customer Concentration Risk | Revenue Benchmark | Nonrelated Party
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%