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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 688.0	$ 719.7	$ 1,424.7	$ 1,460.8
Provision for Rate Refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0.0	0.0	0.0	3.0
Integrated Market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	27.4	26.3	74.7	47.6
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	30.5	42.1	71.2	81.9
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9.2	8.4	20.4	13.7
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	250.7	251.3	504.2	534.9
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	207.1	218.5	413.5	425.1
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	54.7	58.4	113.8	120.0
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	48.5	52.5	106.7	111.9
Public Authority and Street Light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	59.9	62.2	120.2	122.7
System Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 620.9	$ 642.9	$ 1,258.4	$ 1,314.6

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