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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 492.0	$ 501.1	$ 912.4	$ 978.5
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	202.8	182.3	369.7	373.5
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	113.0	115.4	204.3	210.8
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	44.7	52.9	86.2	105.2
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	38.4	48.9	76.6	98.3
Public authorities and street light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	40.6	44.4	75.3	84.5
System sales revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	439.5	443.9	812.1	872.3
Provision for rate refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(1.0)	(0.5)	(1.6)	(0.6)
Integrated market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	8.5	10.3	15.7	17.0
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	39.8	39.8	74.0	75.9
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 5.2	$ 7.6	$ 12.2	$ 13.9

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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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