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Investment in Unconsolidated Affiliates (Tables) | 9 Months Ended
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Sep. 30, 2015
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | The following table summarizes related party transactions between OG&E and its affiliate, Enable, during the three and nine months ended September 30, 2015 and 2014.
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2015 | 2014 | 2015 | 2014
Operating Revenues: |  |  |  |
Electricity to power electric compression assets | $ | 4.4 |  | $ | 4.1 |  | $ | 11.1 |  | $ | 10.1 |
Cost of Sales: |  |  |  |
Natural gas transportation services | $ | 8.8 |  | $ | 8.8 |  | $ | 26.3 |  | $ | 26.2 |
Natural gas storage services | — |  | 0.1 |  | — |  | 4.5 |
Natural gas purchases | 2.5 |  | 3.4 |  | 7.1 |  | 6.9 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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