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Acquisitions - Bishop Hill III (Details) - Bishop Hill III Wind Energy Center
$ in Millions
1 Months Ended
Aug. 31, 2018
USD ($)
MW
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]    
Capacity of generation unit | MW 132.1  
Additional ownership interest acquired   10.00%
Duration of offtake agreement for the sale of energy produced 22 years  
Bonus depreciation percentage 100.00%  
Allocation of the purchase price    
Other long-term assets $ 4.5  
WECI    
Business Acquisition [Line Items]    
Ownership interest in wind generating facility acquired 80.00%  
Acquisition purchase price $ 144.7 $ 18.2
Allocation of the purchase price    
Current assets 1.4  
Net property, plant, and equipment 190.2  
Other long-term assets 4.5  
Current liabilities (1.6)  
Long-term liabilities (8.3)  
Noncontrolling interest (18.8)  
Total purchase price $ 167.4