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LONG-TERM DEBT (Details) - USD ($)
$ in Millions
6 Months Ended
May 22, 2017
May 03, 2016
Jun. 30, 2017
May 21, 2017
Mar. 31, 2017
Dec. 19, 2016
Jul. 01, 2016
Jan. 11, 2016
Jan. 10, 2016
Dec. 24, 2014
Dec. 19, 2014
Revolver loan | Amended Credit Facility                      
Long-term debt                      
Maximum borrowing capacity               $ 400.0 $ 275.0   $ 225.0
Borrowings     $ 0.0                
Revolver loan | Amended Credit Facility | Minimum                      
Long-term debt                      
Commitment fee (as a percent)     0.175%                
Revolver loan | Amended Credit Facility | Minimum | LIBOR                      
Long-term debt                      
Basis spread on variable rate (as a percent)     1.50%                
Revolver loan | Amended Credit Facility | Minimum | Base rate                      
Long-term debt                      
Basis spread on variable rate (as a percent)     0.50%                
Revolver loan | Amended Credit Facility | Maximum                      
Long-term debt                      
Commitment fee (as a percent)     0.25%                
Revolver loan | Amended Credit Facility | Maximum | LIBOR                      
Long-term debt                      
Basis spread on variable rate (as a percent)     1.75%                
Revolver loan | Amended Credit Facility | Maximum | Base rate                      
Long-term debt                      
Basis spread on variable rate (as a percent)     0.75%                
Swingline sub-facility | Amended Credit Facility                      
Long-term debt                      
Maximum borrowing capacity                     10.0
Swingline sub-facility | Amended Credit Facility | Federal Funds Effective Rate                      
Long-term debt                      
Basis spread on variable rate (as a percent)     0.50%                
Swingline sub-facility | Amended Credit Facility | Minimum | Base rate                      
Long-term debt                      
Basis spread on variable rate (as a percent)     1.00%                
Letter of credit sub-facility                      
Long-term debt                      
Commitment fee (as a percent)     1.75%                
Borrowings     $ 0.0                
Outstanding letters of credit     1.2                
Letter of credit sub-facility | Amended Credit Facility                      
Long-term debt                      
Maximum borrowing capacity                     10.0
Term loans | Amended Credit Facility                      
Long-term debt                      
Maximum borrowing capacity               $ 200.0      
Ahana Debt                      
Long-term debt                      
Term loan assumed                   $ 38.9  
Ahana Debt | Minimum                      
Long-term debt                      
Effective interest rate (as a percent)                   4.50%  
Ahana Debt | Maximum                      
Long-term debt                      
Effective interest rate (as a percent)                   6.00%  
PSE&G                      
Long-term debt                      
Stated interest rate                   11.30%  
Outstanding debt     2.4                
Series A Notes And Series B Notes | Ahana Operations                      
Long-term debt                      
Financing costs     2.8                
Outstanding debt     64.6                
Unamortized financing costs     2.8                
Series A Notes | Ahana Operations                      
Long-term debt                      
Debt instrument, face amount           $ 20.6          
Stated interest rate           4.427%          
Series B Notes | Ahana Operations                      
Long-term debt                      
Debt instrument, face amount           $ 45.2          
Stated interest rate           5.327%          
One Communications Debt                      
Long-term debt                      
Maximum borrowing capacity $ 37.5                    
Financing costs $ 0.3                    
Outstanding debt     36.6                
Unamortized financing costs     0.3                
One Communications Debt | Minimum                      
Long-term debt                      
Percentage of notional amount required for hedging arrangement 30.00%                    
One Communications Debt | Minimum | Three month LIBOR                      
Long-term debt                      
Basis spread on variable rate (as a percent) 2.50%                    
One Communications Debt | Maximum                      
Long-term debt                      
Period to enter into hedging arrangement 90 days                    
One Communications Debt | Maximum | Three month LIBOR                      
Long-term debt                      
Basis spread on variable rate (as a percent) 2.75%                    
One Communications Debt | Overdraft Facility                      
Long-term debt                      
Maximum borrowing capacity $ 10.0     $ 5.0              
Borrowings     $ 0.0                
One Communications Debt | Overdraft Facility | Three month LIBOR                      
Long-term debt                      
Basis spread on variable rate (as a percent)     1.75%                
Viya Debt                      
Long-term debt                      
Debt instrument, face amount             $ 60.0        
Financing costs             $ 0.9        
Stated interest rate             4.00%        
Outstanding debt     $ 60.0                
Unamortized financing costs     $ 0.8                
One Communications (formerly KeyTech) | Term loans                      
Long-term debt                      
Term loan assumed   $ 35.4                  
Outstanding debt         $ 28.9            
One Communications (formerly KeyTech) | Term loans | Three month LIBOR                      
Long-term debt                      
Basis spread on variable rate (as a percent)   3.25%                  
Mobility Funds | Letter of credit sub-facility                      
Long-term debt                      
Maximum borrowing capacity                     $ 25.0