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Rate Matters and Regulation Rate Matters and Regulation (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
SmartHours Program [Member] |  |  |
Lost Revenue Associated with Customer Programs | $ 11.1 | $ 11.6 | $ 10.1
SmartHours Program [Member] | Oklahoma Public Utility Division Staff [Member] |  |  |
Lost Revenue Associated with Customer Programs |  |  | 4.9
Reduction of Revenue |  |  | $ 5.2
Regional Haze [Member] |  |  |
Estimated Environmental Capital Costs | $ 1,100.0 |  |

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- Details
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- Details
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