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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 589.2	$ 791.0	$ 1,133.8	$ 1,369.1
Provision for Rate Refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0.6	(2.1)	2.0	(2.7)
Integrated market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	18.8	43.0	31.5	65.8
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	36.1	32.9	71.3	68.7
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11.1	3.0	22.1	9.6
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	216.3	289.3	421.8	516.1
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	155.5	193.4	289.9	321.5
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	51.7	81.4	103.6	138.8
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	46.6	79.0	94.0	132.2
Public Authority and Street Light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	52.5	71.1	97.6	119.1
System Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 522.6	$ 714.2	$ 1,006.9	$ 1,227.7

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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