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Risk Management Activities (Schedule of Gains (Losses) on Commodity Price Risk Programs) (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |
Regulatory Assets | $ 5.7 |
Regulatory Liabilities | 23.3 |
Deferred Derivative Gain (Loss) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Regulatory Liabilities | 23,800,000 | $ 28,700,000
Deferred Derivative Gain (Loss) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Regulatory Assets | $ 10,900,000 | $ 6,500,000

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