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COMMON STOCK - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jan. 15, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Par value of common stock (in dollars per share)   $ 1.25      
Net excess over par value recorded in premium on common stock   $ 179.8      
Shares of common stock outstanding (in shares)   92,388,676   85,506,218  
Incremental shares included in diluted EPS calculation (in shares)   100,012 129,369    
Common Stock, Dividends, Per Share, Cash Paid   $ 0.29 $ 0.28    
SJG Utility Operations          
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      
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Consideration received $ 189.0        
Par value of common stock (in dollars per share)         $ 1.25