Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Risk management assets	$ 16.6	$ 9.1
Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Risk management assets	20.3	17.9
Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Risk management liabilities	1.7	2.3
Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Risk management liabilities	3.8	1.2
Commodity Price Risk Programs \| Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Risk management assets	16.6	9.1
Commodity Price Risk Programs \| Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Risk management assets	20.3	17.9
Commodity Price Risk Programs \| Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Risk management liabilities	1.7	2.3
Commodity Price Risk Programs \| Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Risk management liabilities	$ 3.8	$ 1.2

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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