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ACQUISITIONS - THUNDERHEAD (Details)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
MW
Sep. 30, 2022
USD ($)
MW
Sep. 30, 2021
USD ($)
Asset Acquisition [Line Items]        
Payments to acquire Thunderhead     $ 0.0 $ 119.8
Thunderhead | WECI        
Asset Acquisition [Line Items]        
Ownership interest of wind generating facility acquired   90.00% 90.00%  
Capacity of generation unit | MW   300 300  
Acquisition purchase price   $ 381.9    
Payments to acquire Thunderhead   362.9    
Construction payable   $ 19.0 $ 19.0  
Duration of offtake agreement for the sale of energy produced   12 years    
Thunderhead | WECI | Subsequent event        
Asset Acquisition [Line Items]        
Construction payable $ 9.5      
Payments for previous acquisition $ 9.5