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

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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