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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Nov. 01, 2018
Aug. 14, 2018
Sep. 30, 2018
Sep. 30, 2017
Merger Agreement [Abstract]        
Common stock: par value (in dollars per share)   $ 0.001 $ 0.001 $ 0.001
Maximum [Member]        
Merger Agreement [Abstract]        
Line of credit facility, borrowing capacity   $ 200.0    
New Term Loan Facility [Member] | Maximum [Member]        
Merger Agreement [Abstract]        
Debt Instrument, Face Amount   $ 1,065.0    
New Credit Facilities [Member]        
Merger Agreement [Abstract]        
Undrawn commitment fee percentage     0.175%  
KMG [Member]        
Merger Agreement [Abstract]        
Common stock: par value (in dollars per share)   $ 0.01    
Merger Consideration (in dollars per share)   $ 55.65    
Consideration transferred equity interests issuable per share unit (in shares)   0.2000    
Merger consideration   $ 1,500.0    
Merger termination fee   $ 38.8    
Subsequent Event [Member] | New Revolving Facility [Member]        
Merger Agreement [Abstract]        
Debt instrument term 5 years      
Subsequent Event [Member] | New Revolving Facility [Member] | LIBOR [Member] | Minimum [Member]        
Merger Agreement [Abstract]        
Basis spread on variable rate 1.00%      
Subsequent Event [Member] | New Revolving Facility [Member] | LIBOR [Member] | Maximum [Member]        
Merger Agreement [Abstract]        
Basis spread on variable rate 1.75%      
Subsequent Event [Member] | New Term Loan Facility [Member]        
Merger Agreement [Abstract]        
Debt instrument term 7 years      
Subsequent Event [Member] | New Term Loan Facility [Member] | LIBOR [Member]        
Merger Agreement [Abstract]        
Basis spread on variable rate 2.25%      
Subsequent Event [Member] | New Credit Facilities [Member]        
Merger Agreement [Abstract]        
Quarterly installments as a percentage of principal amount 0.25%      
Undrawn commitment fee percentage 0.30%      
Subsequent Event [Member] | New Credit Facilities [Member] | Maximum [Member]        
Merger Agreement [Abstract]        
Secured net leverage ratio 4.00