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AFFILIATIONS, DISCONTINUED OPERATIONS AND RELATED-PARTY TRANSACTIONS - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
mi
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
mi
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]          
Length of pipeline (in miles) | mi 118   118    
Investments in unconsolidated affiliates     $ 6.0 $ 8.2  
Notes receivable - affiliate $ 17.1   $ 17.1   $ 15.2
Interest accrual on secured notes receivable 7.50%   7.50%    
Net asset - included in investment in affiliates and other noncurrent liabilities $ 84.2   $ 84.2    
Combined equity contributions and the notes receivable - affiliate     $ 101.3    
PennEast Pipeline Company, LLC (PennEast)          
Schedule of Equity Method Investments [Line Items]          
Equity interest 20.00%   20.00%    
Energenic US LLC          
Schedule of Equity Method Investments [Line Items]          
Equity interest 50.00%   50.00%    
Millennium Account Services, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity interest 50.00%   50.00%    
Potato Creek, LLC (Potato Creek)          
Schedule of Equity Method Investments [Line Items]          
Equity interest 30.00%   30.00%    
EnerConnex, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity interest 25.00%   25.00%    
Secured Debt          
Schedule of Equity Method Investments [Line Items]          
Notes receivable - affiliate $ 13.6   $ 13.6   13.6
Unsecured promissory notes          
Schedule of Equity Method Investments [Line Items]          
Notes receivable - affiliate $ 3.5   $ 3.5   $ 1.6
South Jersey Energy Company | EnergyMark          
Schedule of Equity Method Investments [Line Items]          
Equity interest 33.00%   33.00%    
SJRG | EnergyMark          
Schedule of Equity Method Investments [Line Items]          
Total operating revenue, affiliates $ 3.4 $ 7.7 $ 22.6 $ 29.0