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Investments (Acquisitions) (Details) $ in Millions |  | 3 Months Ended | 24 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 USD ($) business | Jun. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) MWh business
Edison Energy Group |  |  |
Investment Holdings [Line Items] |  |  |
After tax charge related to the buy-out of an earn-out provision |  | $ 13.0 |
Edison Energy Group | Series of Individually Immaterial Business Acquisitions |  |  |
Investment Holdings [Line Items] |  |  |
Businesses acquired | business | 3 |  |
Aggregate purchase price | $ 100.0 |  |
Intangible Assets, Net (Including Goodwill) | $ 90.0 |  |
Subsidiary Of SoCore Energy [Member] | Minnesota solar garden development project |  |  |
Investment Holdings [Line Items] |  |  |
Aggregate purchase price |  |  | $ 19.4
Power generating capacity of acquired projects (in megawatts) | MWh |  |  | 42
Subsidiary Of SoCore Energy [Member] | Series of Individually Immaterial Business Acquisitions |  |  |
Investment Holdings [Line Items] |  |  |
Businesses acquired | business |  |  | 6
SoCore Energy | Minnesota solar garden development project |  |  |
Investment Holdings [Line Items] |  |  |
Reimbursed project-specific interconnection costs |  |  | $ 2.6

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