FINANCIAL INSTRUMENTS - Narrative (Details) - South Jersey Gas Company - Financing Receivable - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Inputs, Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans, net of unamortized discounts	$ 1.6	$ 1.7
Loans for upgrading equipment for energy efficiency	57.7	55.4
Current portion of EET loans receivable	11.7	11.1
Loans for upgrading equipment for energy efficiency, noncurrent	$ 46.0	$ 44.3
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of note (in years)	3 years
Loans for upgrading equipment for energy efficiency, term (in years)	2 years
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of note (in years)	5 years
Loans for upgrading equipment for energy efficiency, term (in years)	10 years