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Summary of Significant Accounting Policies Operating Revenues (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) contract performance_obligations	Dec. 31, 2023 USD ($)	Dec. 31, 2022 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 \| $	$ 24.3	$ 23.5	$ 23.4