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Merger (Details) - Merger Agreement - Forecast - USD ($)
$ / shares in Units, $ in Millions
Apr. 20, 2023
Dec. 31, 2022
Business Acquisition [Line Items]    
Business combination, cash right per common share (in dollars per share)   $ 50.30
Termination fees $ 130.0  
Out-of-pocket fees and expenses reimbursement 10.0  
Avangrid    
Business Acquisition [Line Items]    
Termination fees $ 184.0