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DEBT (Narrative) (Details)
 3 Months Ended 12 Months Ended
Feb. 04, 2020
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 09, 2020
USD ($)
Feb. 03, 2020
USD ($)
Debt Instrument [Line Items]                
Term loan component of senior credit facility, classified as current       $ 33,750,000 $ 45,000,000      
Long-term convertible securities       474,834,000 0      
Cost of call transactions       104,248,000 0 $ 0    
Proceeds from warrant transactions       44,563,000 0 $ 0    
Securitization facility, outstanding borrowings, maximum limit       $ 150,000,000.0        
Securitization facility, term       3 years        
Current portion of borrowings under securitization facility       $ 112,500,000 0      
Long-term borrowings under securitization facility       $ 0 $ 104,500,000      
Security facility, weighted average interest rate       1.30% 2.80%      
Level 2                
Debt Instrument [Line Items]                
Securitization facility, fair value of amount outstanding       $ 112,300,000        
Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity               $ 1,300,000,000
Line of credit facility outstanding       $ 97,500,000 $ 375,000,000.0      
Weighted average interest rate on debt       1.50% 3.20%      
Revolving Credit Facility | Level 2                
Debt Instrument [Line Items]                
Line of credit facility, fair value of amount outstanding       $ 98,400,000        
Standby Letters of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity               60,000,000.0
Swingline Loan                
Debt Instrument [Line Items]                
Maximum borrowing capacity               60,000,000.0
Senior Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity               2,200,000,000
Capitalized incremental financing costs               4,600,000
Previously capitalized financing costs, written-off     $ 1,200,000          
Incremental financing cost expense   $ 3,300,000            
Senior Credit Facility | Minimum                
Debt Instrument [Line Items]                
Line of credit, commitment fee percentage       0.15%        
Senior Credit Facility | Maximum                
Debt Instrument [Line Items]                
Line of credit, commitment fee percentage       0.30%        
Senior Credit Facility | Eurodollar Rate | Minimum                
Debt Instrument [Line Items]                
Interest rates available to the company at its option       1.00%        
Senior Credit Facility | Eurodollar Rate | Maximum                
Debt Instrument [Line Items]                
Interest rates available to the company at its option       2.25%        
Senior Credit Facility | Overnight Federal Funds Rate                
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 | Standby Letters of Credit                
Debt Instrument [Line Items]                
Line of credit facility outstanding       $ 0        
Letters of credit outstanding       1,600,000 $ 800,000      
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% 3.20%      
Term loan component of senior credit facility, classified as current       $ 33,800,000        
Term Loan Facility | Secured Debt | Level 2                
Debt Instrument [Line Items]                
Line of credit facility, fair value of amount outstanding       883,600,000        
2025 Notes | Convertible Debt                
Debt Instrument [Line Items]                
Capitalized incremental financing costs $ 13,200,000              
Convertible notes, aggregate principal amount $ 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%              
Long-term convertible securities       485,900,000        
Unamortized discount       89,100,000        
Fair value       638,100,000        
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%              
Combination settlement for debt conversion, minimum settled in cash per principal amount             $ 1,000  
Redemption price, percentage 100.00%              
Warrant strike price (in dollars per share) | $ / shares $ 113.34              
Cash interest       2,600,000        
Amortization of discount       15,400,000        
Interest expense       18,000,000.0        
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