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Acquisitions - Bishop Hill III (Details) - Bishop Hill III
$ in Millions
1 Months Ended
Dec. 31, 2018
USD ($)
Aug. 31, 2018
USD ($)
MW
Business Acquisition    
Capacity of generation unit | MW   132.1
Cash and restricted cash acquired   $ 4.5
Duration of offtake agreement for the sale of energy produced   22 years
WECI    
Business Acquisition    
Ownership interest in generating facility acquired   80.00%
Acquisition purchase price $ 18.2 $ 144.7
Additional ownership interest acquired 10.00%  
Total investment in generation facility $ 162.9  
Allocation of the purchase price    
Current assets   1.4
Net property, plant, and equipment   190.2
Current liabilities   (1.6)
Long-term liabilities   (8.3)
Noncontrolling interest   (18.8)
Total purchase price   $ 162.9