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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 945.2	$ 923.0	$ 2,171.9	$ 2,056.8
Provision for Rate Refund and Tax Refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(43.5)	0.0	(43.5)	2.0
Integrated Market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	19.2	26.2	51.3	57.7
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	36.6	35.6	114.7	106.9
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7.6	10.4	23.1	32.5
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	412.6	389.7	873.0	811.5
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	282.4	237.0	608.8	522.0
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	77.5	76.5	185.7	183.5
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	67.8	67.5	165.1	163.0
Public Authority and Street Light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	85.0	80.1	193.7	177.7
System Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 925.3	$ 850.8	$ 2,026.3	$ 1,857.7

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