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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2019
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] | The following table disaggregates the Company's revenues from contracts with customers by customer classification. The Company's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" within "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2019 | 2018 |  | 2019 | 2018
Residential | $ | 182.3 |  | $ | 217.3 |  |  | $ | 373.5 |  | $ | 413.5 |
Commercial | 115.4 |  | 135.1 |  |  | 210.8 |  | 235.9 |
Industrial | 52.9 |  | 57.0 |  |  | 105.2 |  | 107.4 |
Oilfield | 48.9 |  | 45.7 |  |  | 98.3 |  | 87.8 |
Public authorities and street light | 44.4 |  | 51.1 |  |  | 84.5 |  | 92.8 |
System sales revenues | 443.9 |  | 506.2 |  |  | 872.3 |  | 937.4 |
Provision for rate refund | (0.5 | ) | (16.5 | ) |  | (0.6 | ) | (19.7 | )
Integrated market | 10.3 |  | 13.1 |  |  | 17.0 |  | 21.8 |
Transmission | 39.8 |  | 40.2 |  |  | 75.9 |  | 76.0 |
Other | 7.6 |  | 4.7 |  |  | 13.9 |  | 10.1 |
Revenues from contracts with customers | $ | 501.1 |  | $ | 547.7 |  |  | $ | 978.5 |  | $ | 1,025.6 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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