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Risk Management Activities (Schedule of Gains (Losses) on Commodity Price Risk Programs) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred Derivative Gain (Loss) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Regulatory Liabilities | $ 111.9 | $ 34.2
Deferred Derivative Gain (Loss) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Regulatory Assets | $ 1.1 | $ 9.6

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