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Investments (Acquisitions) (Details) - Minnesota solar garden development projects $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 project MW | Sep. 30, 2016 USD ($) project MW | Oct. 31, 2016 project
Schedule of Equity Method Investments [Line Items] |  |  |
Number of development projects |  | 14 |
Power generating capacity (in megawatts) | MW |  | 94 |
Forecast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of available projects | 3 |  |
Power generating capacity (in megawatts) | MW | 21 |  |
Subsequent event |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Expired projects not acquired |  |  | 6
Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of available projects |  | 20 |
Purchase price | $ |  | $ 41.9 |
Reimbursed project specific interconnection costs | $ |  | $ 8.7 |

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