COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) employee lawsuit contract plaintiff	Dec. 31, 2021 USD ($) employee
Loss Contingencies [Line Items]
Annual supply contract fees	$ 95.2
Total supply contract fees	$ 465.8
Number of supply contracts executed | contract	2
Supply contracts, percentage of financial commitment to expire within five years	39.00%
Supply contracts, term	5 years
Number of employees | employee	1,169	1,173
Number of lawsuits filed | lawsuit	8
Approximate amount accrued related to all claims	$ 10.3	$ 11.3
Complaints In Connection With Merger Agreement
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff	8
Lawsuits Filed in the United States District Court for the Southern District of New York
Loss Contingencies [Line Items]
Number of lawsuits filed | lawsuit	5
Lawsuits Filed in the United States District Court for the Eastern District of New York
Loss Contingencies [Line Items]
Number of lawsuits filed | lawsuit	1
Lawsuits Filed in the United States District Court for the District of New Jersey
Loss Contingencies [Line Items]
Number of lawsuits filed | lawsuit	1
Lawsuits Filed in the United States District Court for the Eastern District of Pennsylvania
Loss Contingencies [Line Items]
Number of lawsuits filed | lawsuit	1
Unionized Collective Bargaining Agreements | ETG Utility Operations
Loss Contingencies [Line Items]
Number of employees with labor union representation | employee	214	233
South Jersey Gas Company
Loss Contingencies [Line Items]
Number of employees | employee	420	432
Approximate amount accrued related to all claims	$ 9.4	$ 10.0
South Jersey Gas Company | Unionized Collective Bargaining Agreements
Loss Contingencies [Line Items]
Number of employees with labor union representation | employee	282	289
REV LNG
Loss Contingencies [Line Items]
Committed capital contribution	$ 93.4	$ 62.6
Parental Guarantee
Loss Contingencies [Line Items]
Parental guarantees	$ 11.4
Contract term	1 year