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LONG-TERM DEBT (Details) - USD ($)
$ in Millions
3 Months Ended
May 03, 2016
Mar. 31, 2017
Apr. 14, 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   5.9              
Letter of credit sub-facility | Amended Credit Facility                  
Long-term debt                  
Maximum borrowing capacity                 10.0
Outstanding letters of credit   5.9              
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   2.1              
Series A Notes And Series B Notes                  
Long-term debt                  
Outstanding debt   64.6              
Series A Notes | Ahana Operations                  
Long-term debt                  
Secured debt principal amount       $ 20.6          
Stated interest rate       4.427%          
Series B Notes | Ahana Operations                  
Long-term debt                  
Secured debt principal amount       $ 45.2          
Stated interest rate       5.327%          
One Communications (formerly KeyTech) | Revolver loan | Amended Credit Facility                  
Long-term debt                  
Maximum borrowing capacity     $ 60.0            
One Communications (formerly KeyTech) | Revolver loan | Amended Credit Facility | Maximum                  
Long-term debt                  
Potential cash dividend           13.0      
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%                
Viya (formerly Innovative)                  
Long-term debt                  
Finance costs to lock in rate         $ 0.9        
Stated interest rate         4.00%        
Unamortized balance of financing fee to lock interest rate   0.8              
Outstanding debt   $ 60.0              
Viya (formerly Innovative) | Revolver loan | Amended Credit Facility | Maximum                  
Long-term debt                  
Secured debt principal amount           $ 60.0      
Viya (formerly Innovative) | Term loans                  
Long-term debt                  
Secured debt principal amount         $ 60.0        
Mobility Funds | Letter of credit sub-facility | Amended Credit Facility                  
Long-term debt                  
Maximum borrowing capacity                 $ 25.0