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DEBT - Convertible Senior Notes due in 2028 Narrative (Details)
$ / shares in Units, shares in Millions
3 Months Ended
Mar. 01, 2021
USD ($)
trading_day
$ / shares
shares
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Payment for bonds hedge   $ 286,235,000 $ 89,056,000
Proceeds from sale of warrants   220,800,000 $ 71,552,000
Convertible Notes | Convertible Senior Notes Due 2028      
Debt Instrument [Line Items]      
Debt instrument face amount $ 575,000,000    
Interest rate 0.00%    
Proceeds from convertible debt $ 566,400,000    
Conversion ratio 0.0035104    
Debt conversion price (in USD per share) | $ / shares $ 284.87    
Convertible note, liability component $ 415,000,000.0    
Convertible note, equity component 160,000,000.0    
Debt issuance costs 9,100,000    
Unamortized debt issuance costs 6,600,000 6,500,000  
Debt issuance costs, allocated to capital $ 2,500,000    
Unamortized discount   $ 158,400,000  
Remaining discount amortization period   6 years 10 months 24 days  
Conversion shares (in shares) | shares 2.0    
Payment for bonds hedge $ 161,600,000    
Warrants issued, strike price (in USD per share) | $ / shares $ 397.91    
Proceeds from sale of warrants $ 123,400,000    
Convertible Notes | Convertible Senior Notes Due 2028 | Discount rate      
Debt Instrument [Line Items]      
Measurement input   0.0477  
Period One | Convertible Notes | Convertible Senior Notes Due 2028      
Debt Instrument [Line Items]      
Threshold percentage 130.00%    
Stock trigger price (in USD per share) | $ / shares $ 370.33    
Number of threshold trading days | trading_day 20    
Number of consecutive trading days | trading_day 30    
Measurement period percentage of stock price trigger 98.00%    
Period Two | Convertible Notes | Convertible Senior Notes Due 2028      
Debt Instrument [Line Items]      
Threshold percentage 100.00%    
Number of consecutive trading days | trading_day 5