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Investment in Unconsolidated Affiliates (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2015 and 2014.
| Three Months Ended
| March 31,
(In millions) | 2015 | 2014
Operating Revenues: |  |
Electricity to power electric compression assets | $ | 3.1 |  | $ | 2.9 |
Cost of Sales: |  |
Natural gas transportation services | $ | 8.8 |  | $ | 8.7 |
Natural gas storage services | — |  | 3.3 |
Natural gas purchases | 2.5 |  | 5.0 |

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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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