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Summary of Significant Accounting Policies Operating Revenues (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) contract performance_obligations | Dec. 31, 2021 USD ($) | Dec. 31, 2020 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 | $ | $ 23.4 | $ 23.3 | $ 22.9

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045 + Details
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