Risk Management Activities (Narrative) (Details) mMDth in Millions, $ in Millions	Jun. 30, 2026 USD ($) mMDth	Dec. 31, 2025 USD ($) mMDth
Derivative [Line Items]
Limit of GCA Volumes	20.00%
Derivative Asset, Subject to Master Netting Arrangement, after Offset \| $	$ 2.7	$ 12.9
Customer annual demand	2000.00%
Minimum
Derivative [Line Items]
Commodity Contract Length	1 year
Maximum
Derivative [Line Items]
Commodity Contract Length	6 years
Natural Gas
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| mMDth	80.9	83.7

Fair value, after effect of master netting arrangement, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Includes derivative subject to master netting arrangement not elected or qualified to offset. Excludes derivative not subject to master netting arrangement or similar agreement.