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Acquisitions, Discontinued Operations and Dispositions - Sale of Assets Prior to Discontinued (Details) $ in Millions | Jan. 11, 2019 USD ($) | Dec. 31, 2018 MW | Jun. 19, 2018 USD ($) | Mar. 30, 2018 USD ($) MW | Mar. 27, 2017 USD ($) MW | Sep. 01, 2016 USD ($)
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Generation capacity (in MW) | MW |  | 23,000 |  |  |  |
UPMC Thermal Project |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  |  | $ 84.0 |  |  |
Buckthorn Renewables, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  | $ 42.0 |  |
Percentage of ownership sold |  |  |  | 100.00% |  |
Generation capacity (in MW) | MW |  |  |  | 154 |  |
Debt assumed |  |  |  | $ 183.0 |  |
Agua Caliente Solar Project |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 130.0 |
Debt assumed |  |  |  |  | 328.0 |
Working capital adjustments |  |  |  |  | $ 1.0 |
Agua Caliente Solar Project | Agua Caliente |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of ownership sold |  |  |  |  | 16.00% |
Generation capacity (in MW) | MW |  |  |  |  | 46 |
Agua Caliente Solar Project | Utah Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  | 265 |
Number Of utility scale solar projects | MW |  |  |  |  | 7 |
CVSR |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 78.5
Percentage of ownership sold |  |  |  |  |  | 51.05%
Debt assumed |  |  |  |  |  | $ 496.0
Subsequent Event | UPMC Thermal Project |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration | $ 3.0 |  |  |  |  |

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