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DERIVATIVE INSTRUMENTS - Outstanding Contracts (Details)
MMcfe in Thousands, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
MMcfe
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Energy Related Derivative          
Derivative [Line Items]          
Unrealized gains (losses) | $     $ 50.4   $ 22.1
Energy Related Derivative | South Jersey Gas Company          
Derivative [Line Items]          
Unrealized gains (losses) | $     24.1   $ 7.1
Derivatives not designated as hedging instruments under GAAP          
Derivative [Line Items]          
Gain (loss) on energy related derivative instruments not designated as hedging instruments | $ $ (33.9) $ (15.2) $ (55.2) $ (15.3)  
Derivatives not designated as hedging instruments under GAAP | Expected future purchases of natural gas (in MMdts) | Purchases          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh)     72,900    
Derivatives not designated as hedging instruments under GAAP | Expected future purchases of natural gas (in MMdts) | Purchases | South Jersey Gas Company          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh)     12,400    
Derivatives not designated as hedging instruments under GAAP | Expected future purchases of natural gas (in MMdts) | Sales          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh)     80,700    
Derivatives not designated as hedging instruments under GAAP | Expected future purchases of natural gas (in MMdts) | Sales | South Jersey Gas Company          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh)     100    
Derivatives not designated as hedging instruments under GAAP | Basis and Index related net purchase contracts (in MMdts)          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh)     93,500    
Derivatives not designated as hedging instruments under GAAP | Basis and Index related net purchase contracts (in MMdts) | South Jersey Gas Company          
Derivative [Line Items]          
Notional amount (natural gas in mmcfe and electricity in mwh)     8,500