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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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