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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,028.4	$ 945.2	$ 2,489.2	$ 2,171.9
Provision for Rate Refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0.0	(43.5)	3.0	(43.5)
Integrated Market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	23.6	19.2	71.2	51.3
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	38.8	36.6	120.7	114.7
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	13.1	7.6	26.8	23.1
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	399.2	412.6	934.1	873.0
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	314.0	282.4	739.1	608.8
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	80.5	77.5	200.5	185.7
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	73.0	67.8	184.9	165.1
Public Authority and Street Light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	86.2	85.0	208.9	193.7
System Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 952.9	$ 925.3	$ 2,267.5	$ 2,026.3

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