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INDEBTEDNESS - Convertible Senior Notes Narrative (Details) - Convertible Debt
$ / shares in Units, shares in Millions
3 Months Ended 39 Months Ended
Nov. 13, 2020
USD ($)
day
$ / shares
Mar. 05, 2020
USD ($)
day
$ / shares
May 25, 2018
USD ($)
day
$ / shares
Mar. 06, 2017
USD ($)
day
$ / shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Jan. 01, 2021
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                
Conversion price (in USD per share) | $ / shares   $ 121.01 $ 77.85 $ 22.95        
Carrying amount of equity component               $ 502,708,000
Issuance costs attributable to the liability component         $ 32,309,000 $ 32,309,000   28,958,000
2026 and 2027 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount $ 1,150,000,000              
Conversion rate 0.003343              
Conversion price (in USD per share) | $ / shares $ 299.13              
Redemption price, percentage 100.00%              
Carrying amount of equity component $ 198,000,000.0              
Discounts and commissions payable 17,500,000              
Third party offering costs $ 1,000,000.0              
Amount of if-converted value in excess of outstanding principal amount         0      
2026 and 2027 Notes | Debt Instrument, Conversion Term One                
Debt Instrument [Line Items]                
Threshold trading days | day 20              
Threshold consecutive trading days | day 30              
Threshold percentage of stock price trigger 130.00%              
2026 and 2027 Notes | Debt Instrument Conversion Term Two                
Debt Instrument [Line Items]                
Threshold trading days | day 5              
Threshold consecutive trading days | day 5              
Threshold percentage of stock price trigger 98.00%              
2026 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount $ 575,000,000.0              
Interest rate 0.00%              
Conversion price (in USD per share) | $ / shares $ 299.13              
Carrying amount of equity component               $ 85,595,000
Effective interest rate of the liability component 3.35%             3.35%
Issuance costs attributable to the liability component         8,652,000 8,652,000   $ 7,711,000
2026 Notes | Accounting Standards Update 2020-06                
Debt Instrument [Line Items]                
Effective interest rate of the liability component             0.49%  
2027 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount $ 575,000,000.0              
Interest rate 0.25%              
Conversion price (in USD per share) | $ / shares $ 299.13              
Carrying amount of equity component               $ 109,207,000
Effective interest rate of the liability component 3.66%             3.66%
Issuance costs attributable to the liability component         8,790,000 8,790,000   $ 7,370,000
2027 Notes | Accounting Standards Update 2020-06                
Debt Instrument [Line Items]                
Effective interest rate of the liability component             0.30%  
2025 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount   $ 1,000,000,000.0            
Interest rate   0.125%            
Conversion rate   0.0082641            
Conversion price (in USD per share) | $ / shares   $ 121.01            
Redemption price, percentage   100.00%            
Carrying amount of equity component   $ 154,600,000           $ 152,258,000
Effective interest rate of the liability component   3.81%           3.81%
Discounts and commissions payable   $ 14,300,000            
Third party offering costs   900,000            
Issuance costs attributable to the liability component $ 15,400,000 $ 12,800,000     11,918,000 11,918,000   $ 11,333,000
Amount of if-converted value in excess of outstanding principal amount         876,400,000      
2025 Notes | Accounting Standards Update 2020-06                
Debt Instrument [Line Items]                
Effective interest rate of the liability component             0.43%  
2025 Notes | Debt Instrument, Conversion Term One                
Debt Instrument [Line Items]                
Threshold trading days | day   20            
Threshold consecutive trading days | day   30            
Threshold percentage of stock price trigger   130.00%            
2025 Notes | Debt Instrument Conversion Term Two                
Debt Instrument [Line Items]                
Threshold trading days | day   5            
Threshold consecutive trading days | day   5            
Threshold percentage of stock price trigger   98.00%            
2023 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount     $ 862,500,000          
Interest rate     0.50%          
Conversion rate     0.0128456          
Conversion price (in USD per share) | $ / shares     $ 77.85          
Carrying amount of equity component     $ 155,300,000         $ 154,019,000
Effective interest rate of the liability component     4.69%         4.69%
Discounts and commissions payable     $ 6,000,000.0          
Third party offering costs     800,000          
Issuance costs attributable to the liability component     $ 5,600,000   2,925,000 2,925,000   $ 2,474,000
Amount of if-converted value in excess of outstanding principal amount         1,700,000,000      
2023 Notes | Accounting Standards Update 2020-06                
Debt Instrument [Line Items]                
Effective interest rate of the liability component             0.66%  
2023 Notes | Debt Instrument, Conversion Term One                
Debt Instrument [Line Items]                
Threshold trading days | day     20          
Threshold consecutive trading days | day     30          
Threshold percentage of stock price trigger     130.00%          
2023 Notes | Debt Instrument Conversion Term Two                
Debt Instrument [Line Items]                
Threshold trading days | day     5          
Threshold consecutive trading days | day     5          
Threshold percentage of stock price trigger     98.00%          
2022 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount       $ 440,000,000.0        
Interest rate       0.375%        
Conversion rate       0.0435749        
Conversion price (in USD per share) | $ / shares       $ 22.95        
Carrying amount of equity component       $ 86,200,000       $ 1,629,000
Effective interest rate of the liability component       5.34%       5.34%
Discounts and commissions payable       $ 11,000,000.0        
Third party offering costs       800,000        
Issuance costs attributable to the liability component       $ 9,400,000 24,000 24,000   $ 70,000
Notes converted         $ 3,800,000 435,300,000    
Principal payment on conversion of senior notes           $ 219,400,000    
Shares issued upon conversion (in shares) | shares         0.2 16.3    
Amount of if-converted value in excess of outstanding principal amount         $ 41,900,000      
2022 Notes | Accounting Standards Update 2020-06                
Debt Instrument [Line Items]                
Effective interest rate of the liability component             0.93%  
2022 Notes | Debt Instrument, Conversion Term One                
Debt Instrument [Line Items]                
Threshold trading days | day       20        
Threshold consecutive trading days | day       30        
Threshold percentage of stock price trigger       130.00%        
2022 Notes | Debt Instrument Conversion Term Two                
Debt Instrument [Line Items]                
Threshold trading days | day       5        
Threshold consecutive trading days | day       5        
Threshold percentage of stock price trigger       98.00%