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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2018
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] | The Company's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" in "Item 2. Management's Discussion and Analysis."
| Three Months Ended
(In millions) | March 31, 2018
Residential | $ | 196.3 |
Commercial | 117.8 |
Industrial | 41.7 |
Oilfield | 33.7 |
Public authorities and street light | 41.7 |
System sales revenues | 431.2 |
Provision for rate refund | (3.2 | )
Integrated market | 8.6 |
Transmission | 35.8 |
Other | 5.5 |
Revenues from contracts with customers | $ | 477.9 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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