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DEBT - Narrative (Details)
 3 Months Ended
Feb. 04, 2020
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Feb. 03, 2020
USD ($)
Debt Instrument [Line Items]            
Term loan component of senior credit facility   $ 45,000,000     $ 33,750,000  
Cost of call transactions   0   $ 104,248,000    
Proceeds from warrant transactions   0   44,562,000    
Carrying amount, liability component   562,240,000     474,834,000  
Securitization program outstanding borrowings, maximum limit   $ 150,000,000.0        
Securitization program, term   3 years        
Secured long-term debt, securitization program, noncurrent   $ 110,900,000     $ 112,500,000  
Weighted average interest rate, accounts receivable securitization revolving loan facility   1.30%     1.30%  
Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Securitization facility, outstanding borrowings, fair value   $ 110,800,000        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 1,300,000,000
Line of credit facility outstanding   $ 97,500,000     $ 97,500,000  
Weighted average interest rate on debt   1.50%     1.50%  
Revolving Credit Facility | Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Line of credit facility, fair value of amount outstanding   $ 98,500,000        
Standby Letters of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity           60,000,000
Swingline Loans            
Debt Instrument [Line Items]            
Maximum borrowing capacity           60,000,000
Senior Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity           2,200,000,000
Incremental financing costs capitalized           4,600,000
Previously capitalized financing costs, written-off       1,200,000    
Incremental financing cost expense     $ 3,300,000      
Senior Credit Facility | Overnight Federal Funds            
Debt Instrument [Line Items]            
Interest rates available   0.50%        
Senior Credit Facility | One Month Eurodollar Rate            
Debt Instrument [Line Items]            
Interest rates available   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   1.00%        
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   2.25%        
Senior Credit Facility | Standby Letters of Credit            
Debt Instrument [Line Items]            
Line of credit facility outstanding   $ 0        
Letters of credit outstanding         $ 1,600,000  
Term Loan Facility | Secured Debt            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 877,500,000
Line of credit facility outstanding   $ 877,500,000     877,500,000  
Weighted average interest rate on debt   1.50%        
Term loan component of senior credit facility   $ 45,000,000.0        
Term Loan Facility | Secured Debt | Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Line of credit facility, fair value of amount outstanding   884,900,000        
2025 Notes | Convertible Debt            
Debt Instrument [Line Items]            
Incremental financing costs capitalized $ 13,200,000          
Convertible notes, maximum borrowing capacity $ 575,000,000.0       575,000,000.0  
Convertible notes, interest rate 0.50%          
Debt proceeds, classified as equity at time of offering $ 104,500,000          
Effective interest rate 4.20%          
Initial conversion rate 13.5739          
Initial conversion price (in dollars per share) | $ / shares $ 73.67          
Maximum selling price of the company's common stock of the conversion price 130.00%          
Maximum average conversion value of notes 98.00%          
Redemption price, percentage 100.00%          
Warrant strike price (in dollars per share) | $ / shares $ 113.34          
Carrying amount, liability component         485,900,000  
Unamortized discount         $ 89,100,000  
Fair value   642,100,000        
Cash interest   $ 700,000        
2025 Notes | Convertible Debt | Call Option            
Debt Instrument [Line Items]            
Cost of call transactions $ 104,200,000          
Proceeds from warrant transactions $ 44,500,000          
Initial strike price (in dollars per share) | $ / shares $ 73.67          
2020 Notes            
Debt Instrument [Line Items]            
Incremental financing cost expense       2,500,000    
Cash interest       400,000    
Interest expense       $ 2,900,000