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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2020
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 March 31, |
(In millions) |  |  |  | 2020 | 2019
Residential |  |  |  | $ | 166.9 |  | $ | 191.2 |
Commercial |  |  |  | 91.3 |  | 95.4 |
Industrial |  |  |  | 41.5 |  | 52.3 |
Oilfield |  |  |  | 38.2 |  | 49.4 |
Public authorities and street light |  |  |  | 34.7 |  | 40.1 |
System sales revenues |  |  |  | 372.6 |  | 428.4 |
Provision for rate refund |  |  |  | (0.6) |  | (0.1) |
Integrated market |  |  |  | 7.2 |  | 6.7 |
Transmission |  |  |  | 34.2 |  | 36.1 |
Other |  |  |  | 7.0 |  | 6.3 |
Revenues from contracts with customers |  |  |  | $ | 420.4 |  | $ | 477.4 |

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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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