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COMMON STOCK - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
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 $ (0.4)      
Shares of common stock outstanding (in shares) 92,443,925     92,394,155
Interest rate 7.50%     7.50%
Quarterly contract adjustment payments, percent     3.55%  
Incremental shares included in diluted EPS calculation (in shares) 111,077 100,012    
Dividends per share (in usd per share) $ 0.30 $ 0.29    
Cash dividends declared (in dollars per share) 0.30 0.29    
Capital Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued (in shares)     5,750,000  
Corporate Unit, stated value per share (in dollars per share)     $ 50  
Over-Allotment Option | Capital Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued (in shares)     750,000  
Series 2018A, Due 2031        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Interest rate     3.70%  
Series 2018A, Due 2031 | Capital Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Interest in notes issued, percent     5.00%  
SJG        
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      
Dividends per share (in usd per share) $ 0 0    
Cash dividends declared (in dollars per share) $ 0 $ 0