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COMMITMENTS (Commitments) (Narrative) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
D
Dec. 31, 2020
USD ($)
Renewable energy tax credit equity investments    
Commitments    
Capital contributions $ 5.7  
Senior notes [Member]    
Commitments    
Debt instrument minimum number of days callable | D 30  
Debt instrument maximum number of days callable | D 60  
Percentage principal amount of debt that can be redeemed by the Company 100.00%  
Percentage principal amount of debt redeemable upon change in control 101.00%  
Revolving Credit Facility [Member] | Unsecured debt [Member]    
Commitments    
Letters of credit $ 84.0 $ 66.4
Construction [Member]    
Commitments    
Construction commitments $ 33.8