REVENUE (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues from alternative revenue programs	$ (6.4)	$ 1.2	$ 26.6	$ 22.5
SJG
Disaggregation of Revenue [Line Items]
Total revenues from alternative revenue programs	$ (5.8)	$ 1.2	$ 19.6	$ 27.2