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Acquisitions - Upstream (Details) - Upstream
$ in Millions
1 Months Ended
Jan. 31, 2019
USD ($)
MW
Feb. 19, 2020
USD ($)
Business Acquisition [Line Items]    
Capacity of generation unit | MW 202.5  
Cash and restricted cash acquired $ 9.2  
Number of years Upstream will receive fixed payment 10 years  
Bonus depreciation percentage 100.00%  
Allocation of the purchase price    
Restricted cash $ 8.1  
WECI    
Business Acquisition [Line Items]    
Ownership interest in wind generating facility acquired 80.00%  
Acquisition purchase price $ 268.2  
Allocation of the purchase price    
Current assets 1.5  
Net property, plant, and equipment 341.6  
Other long-term assets 22.9  
Current liabilities (4.6)  
Long-term liabilities (15.0)  
Noncontrolling interest (69.0)  
Total purchase price $ 277.4  
Subsequent event    
Business Acquisition [Line Items]    
Additional ownership interest acquired   10.00%
Subsequent event | WECI    
Business Acquisition [Line Items]    
Acquisition purchase price   $ 31.0