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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Risk Management Assets Current |  |
Derivatives, Fair Value [Line Items] |  |
Risk management assets | $ 5.2 | $ 1.1
Risk Management Assets Noncurrent |  |
Derivatives, Fair Value [Line Items] |  |
Risk management assets | 21.3 | 22.2
Risk Management Liabilities Current |  |
Derivatives, Fair Value [Line Items] |  |
Risk management liabilities | 5.1 | 7.5
Risk Management Liabilities Noncurrent |  |
Derivatives, Fair Value [Line Items] |  |
Risk management liabilities | 2.9 | 1.9
Commodity Price Risk Programs | Risk Management Assets Current |  |
Derivatives, Fair Value [Line Items] |  |
Risk management assets | 5.2 | 1.1
Commodity Price Risk Programs | Risk Management Assets Noncurrent |  |
Derivatives, Fair Value [Line Items] |  |
Risk management assets | 21.3 | 22.2
Commodity Price Risk Programs | Risk Management Liabilities Current |  |
Derivatives, Fair Value [Line Items] |  |
Risk management liabilities | 5.1 | 7.5
Commodity Price Risk Programs | Risk Management Liabilities Noncurrent |  |
Derivatives, Fair Value [Line Items] |  |
Risk management liabilities | $ 2.9 | $ 1.9

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