Merger (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 20, 2023	May 10, 2022	Dec. 31, 2022
Business Acquisition [Line Items]
Proceeding extension period granted		1 year
Merger Agreement | Forecast
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
Merger Agreement | Avangrid | Forecast
Business Acquisition [Line Items]
Termination fees	$ 184.0