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Commitments and Contingencies (Energy Efficiency Incentive Mechanism) (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Oct. 31, 2016 | Aug. 31, 2016
Subsequent event |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Settlement awarded | $ 13.5 |
Incentive Award, Period of Refund | 3 years |
Maximum |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Maximum settlement |  | $ 74.5

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