REGULATION - REGULATORY FILINGS (Details) - NJNG - USD ($) $ in Millions	Dec. 22, 2020	Nov. 20, 2020	Oct. 28, 2020
BPU
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount			$ 150.0
IIP approved term			5 years
BGSS
Schedule of Regulatory Filings [Line Items]
Interim rate increase (decrease), amount	$ (12.5)	$ (10.0)
Interim rate increase (decrease), amount, net of tax	$ (11.7)	$ (9.4)