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Investments (Acquisitions) (Details) $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2017 USD ($) MWh project | Dec. 31, 2015 USD ($) business | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Investment Holdings [Line Items] |  |  |  |
After tax charge related to the buy-out of an earn-out provision |  |  | $ 13.0 |
Minnesota solar garden development project | Subsequent event |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Businesses acquired | project | 4 |  |  |
Aggregate purchase price | $ 10.5 |  |  |
Power generating capacity of acquired projects (in megawatts) | MWh | 28 |  |  |
Minnesota solar garden development project | Maximum |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Purchase price |  |  |  | $ 41.9
Reimbursed project specific interconnection costs |  |  |  | $ 8.7
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 |  |

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