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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 582.6	$ 544.6
Provision for Rate Refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0.0	1.4
Integrated Market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	15.0	12.7
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	35.6	35.2
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	8.1	11.0
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	221.4	205.5
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	148.8	132.3
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	53.0	53.3
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	49.7	48.1
Public Authority and Street Light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	51.0	45.1
System Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 523.9	$ 484.3

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