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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 687.8	$ 739.2	$ 1,600.2	$ 1,717.7
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	294.9	318.9	664.6	692.4
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	156.7	172.9	361.0	383.7
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	59.3	66.8	145.5	172.0
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	50.6	58.6	127.2	156.9
Public authorities and street light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	57.8	65.7	133.1	150.2
System sales revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	619.3	682.9	1,431.4	1,555.2
Provision for rate refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4.8	(2.3)	3.2	(2.9)
Integrated market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	18.0	12.8	33.7	29.8
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	35.0	36.7	109.0	112.6
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 10.7	$ 9.1	$ 22.9	$ 23.0

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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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