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Summary of Significant Accounting Policies Operating Revenues (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) performance_obligations contract | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Electric |  |  |
Disaggregation of Operating Revenues |  |  |
Number of days payment is due | 30 days |  |
Electric | Retail |  |  |
Disaggregation of Operating Revenues |  |  |
Number of performance obligations | 1 |  |
Percent fuel and purchased power costs can vary from the rate case approved costs before deferral is required | 2.00% |  |
Electric | Wholesale |  |  |
Disaggregation of Operating Revenues |  |  |
Number of performance obligations | 2 |  |
Number of contracts | contract | 1 |  |
Natural gas |  |  |
Disaggregation of Operating Revenues |  |  |
Number of days payment is due | 30 days |  |
Other non-utility revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Number of days payment is due | 30 days |  |
Appliance service repairs | Maximum |  |  |
Disaggregation of Operating Revenues |  |  |
Duration of contract for remaining performance obligations in contract | 1 year |  |
We Power revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues amortized from deferred revenue during the period | $ | $ 23.5 | $ 23.4 | $ 23.3

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