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Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Typical length of contract |  |  | Electricity and natural gas products may be sold as fixed-price or variable-price products. The typical length of a contract to provide electricity and/or natural gas is twelve months. |
Electric and Gas Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Excise and sales taxes | $ 0.4 | $ 0.3 | $ 1.0 | $ 0.8
Cost of Services Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Excise and sales taxes | $ 1.4 | $ 1.2 | $ 4.0 | $ 3.4

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