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Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2017
SoCore Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment |  | $ 16.5 |
Goodwill impairment after tax |  | $ 10.0 |
Goodwill |  |  | $ 5.0
Edison Energy Group |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 19.0 |  |
Goodwill impairment after tax | 13.0 |  |
Goodwill | 59.0 |  | $ 78.0
Edison Energy |  |  |
Goodwill [Line Items] |  |  |
Investment | $ 83.0 |  |

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