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DEBT - Narrative (Details)
3 Months Ended
Feb. 04, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 03, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Carrying amount, liability component   $ 460,159,000       $ 0
Cost of call transactions   104,248,000 $ 0      
Proceeds from warrant transactions   44,562,000 $ 0      
Securitization program outstanding borrowings, maximum limit       $ 150,000,000.0    
Securitization program, term       3 years    
Long-term borrowings under securitization facility   $ 98,500,000       $ 104,500,000
Weighted average interest rate, accounts receivable securitization revolving loan facility   2.60%       2.80%
Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Securitization facility, outstanding borrowings, fair value   $ 94,500,000        
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        
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%        
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%          
Carrying amount, liability component   473,000,000.0        
Unamortized discount   102,000,000.0        
Fair value   507,700,000        
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%          
Redemption price, percentage 100.00%          
Warrant strike price (in dollars per share) | $ / shares $ 113.34          
Cash interest   400,000        
Amortization of discount   2,500,000        
Interest expense   2,900,000        
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          
Eurodollar | Senior Credit Facility | Minimum            
Debt Instrument [Line Items]            
Interest rates available   1.00%        
Eurodollar | Senior Credit Facility | Maximum            
Debt Instrument [Line Items]            
Interest rates available   1.75%        
Overnight Federal Funds | Senior Credit Facility            
Debt Instrument [Line Items]            
Interest rates available   0.50%        
One Month Eurodollar Rate | Senior Credit Facility            
Debt Instrument [Line Items]            
Interest rates available   1.00%        
Secured Debt | Term Loan A            
Debt Instrument [Line Items]            
Line of credit facility outstanding   $ 877,500,000       $ 877,500,000
Weighted average interest rate on debt   2.40%       3.20%
Secured Debt | Term Loan A | Secured Debt, Current            
Debt Instrument [Line Items]            
Line of credit facility outstanding   $ 0        
Secured Debt | Term Loan Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity         877,500,000  
Secured Debt | Term Loan Facility | Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Line of credit facility, fair value of amount outstanding   771,300,000        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity         1,300,000,000  
Line of credit facility outstanding   $ 150,000,000.0       $ 375,000,000.0
Weighted average interest rate on debt   2.50%       3.20%
Revolving Credit Facility | Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Line of credit facility, fair value of amount outstanding   $ 130,400,000        
Standby Letters of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity         60,000,000  
Standby Letters of Credit | Senior Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility outstanding   0        
Letters of credit outstanding   $ 800,000       $ 800,000
Swingline Loans            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 60,000,000