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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 477.4 | $ 477.9
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 191.2 | 196.3
Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 115.1 | 117.8
Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 43.1 | 41.7
Oilfield |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 38.9 | 33.7
Public authorities and street light |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 40.1 | 41.7
System sales revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 428.4 | 431.2
Provision for rate refund |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | (0.1) | (3.2)
Integrated market |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 6.7 | 8.6
Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 36.1 | 35.8
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 6.3 | $ 5.5

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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