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DEBT - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
May 03, 2018
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 2,200,000,000
Securitization program outstanding borrowings, maximum limit $ 150,000,000.0      
Securitization program, term 3 years      
Long-term borrowings under securitization facility $ 121,200,000   $ 102,400,000  
Weighted average interest rate, accounts receivable securitization revolving loan facility     3.30%  
Fair Value, Inputs, Level 2        
Debt Instrument [Line Items]        
Securitization facility, outstanding borrowings, fair value     $ 101,100,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity       1,300,000,000
Line of credit facility outstanding $ 345,000,000.0   $ 360,000,000.0  
Weighted average interest rate on debt 4.00%   3.80%  
Revolving Credit Facility | Fair Value, Inputs, Level 2        
Debt Instrument [Line Items]        
Line of credit facility, fair value of amount outstanding     $ 349,300,000  
Standby Letters of Credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity       60,000,000.0
Swingline Loans        
Debt Instrument [Line Items]        
Maximum borrowing capacity       60,000,000.0
Term Loan Facility | Secured Debt        
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 900,000,000.0
Term Loan Facility | Secured Debt | Fair Value, Inputs, Level 2        
Debt Instrument [Line Items]        
Line of credit facility, fair value of amount outstanding     $ 881,800,000  
Senior Credit Facility        
Debt Instrument [Line Items]        
Incremental financing costs capitalized   $ 4,200,000    
Previously capitalized financing costs, written-off   $ 800,000    
Senior Credit Facility | Federal Funds        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     0.50%  
Senior Credit Facility | One Month Eurodollar Rate        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     1.00%  
Senior Credit Facility | Minimum        
Debt Instrument [Line Items]        
Line of credit, commitment fee percentage     0.15%  
Senior Credit Facility | Minimum | Eurodollar        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     1.00%  
Senior Credit Facility | Minimum | Federal Funds        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     0.00%  
Senior Credit Facility | Minimum | Prime Rate        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     0.00%  
Senior Credit Facility | Minimum | One Month Eurodollar Rate        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     0.00%  
Senior Credit Facility | Maximum        
Debt Instrument [Line Items]        
Line of credit, commitment fee percentage     0.30%  
Senior Credit Facility | Maximum | Eurodollar        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     1.75%  
Senior Credit Facility | Maximum | Federal Funds        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     0.75%  
Senior Credit Facility | Maximum | Prime Rate        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     0.75%  
Senior Credit Facility | Maximum | One Month Eurodollar Rate        
Debt Instrument [Line Items]        
Interest rates available to the Company at its option     0.75%  
Senior Credit Facility | Standby Letters of Credit        
Debt Instrument [Line Items]        
Line of credit facility outstanding     $ 0  
Letters of credit outstanding $ 600,000   600,000  
Term Loan A | Secured Debt        
Debt Instrument [Line Items]        
Line of credit facility outstanding $ 900,000,000   $ 900,000,000.0  
Weighted average interest rate on debt 3.90%   3.80%  
Term Loan A | Secured Debt | Secured Debt, Current        
Debt Instrument [Line Items]        
Line of credit facility outstanding     $ 45,000,000.0