COMMON STOCK - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended
	Mar. 18, 2022	Mar. 22, 2021	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Feb. 23, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Par value of common stock (in dollars per share)				$ 1.25
Shares of common stock outstanding (in shares)				122,407,427			117,340,493
Number of shares issued (in shares)				4,996,062
Interest expense, stock sale contract value adjustment				$ 0.2
Stock sale contract liability, current				23.8			$ 23.8
Stock sale contract liability, noncurrent				$ 28.9			$ 34.6
Incremental shares included in diluted EPS calculation (in shares)				1,579,626	1,091,313
NJ Boardwalk Holdings LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Merger agreement, sale price per share (in dollars per share)						$ 36.00
Public Stock Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Par value of common stock (in dollars per share)		$ 1.25
Number of shares offered (in shares)		10,250,000
Price per share (in dollars per share)		$ 22.25
Number of shares issued (in shares)			1,899,859
Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued (in shares)	4,996,062
Net proceeds from public offering, after underwriting discounts and commissions	$ 100.4
2021 Series B Remarketable Junior Subordinated Notes due 2029
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effective interest rate (as a percent)				2.10%
Convertible
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Interest expense, coupon				$ 4.9	$ 2.7
South Jersey Gas Company
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Par value of common stock (in dollars per share)				$ 2.50
Shares of common stock outstanding (in shares)				2,339,139