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ACQUISITIONS - UPSTREAM (Details) - Upstream - WECI
$ in Millions
1 Months Ended
Jan. 31, 2019
USD ($)
MW
Apr. 30, 2020
USD ($)
Business Acquisition [Line Items]    
Ownership interest of wind generating facility acquired 80.00%  
Capacity of generation unit | MW 202.5  
Acquisition purchase price $ 268.2 $ 31.0
Cash and restricted cash acquired $ 9.2  
Additional ownership interest acquired   10.00%
Number of years Upstream will receive fixed payment 10 years  
Bonus depreciation percentage 100.00%  
Allocation of the purchase price    
Current assets $ 0.4  
Net property, plant, and equipment 341.6  
Other long-term assets 14.8  
Current liabilities (4.6)  
Long-term liabilities (15.0)  
Noncontrolling interest (69.0)  
Total purchase price $ 268.2